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Tables

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Earnings Per Share Basic		0.41	0.56	0.35	-0.45	-0.94	0.96	1.07	0.35	0.08	0.19	1.23	0.71	-0.93	0.67	-0.51	0.60	1.44	1.80	1.72	1.71	1.30	1.60	1.46	1.05	5.60	1.04	0.98	0.67	-5.22	0.80	0.78	0.53	0.80	0.72	0.61	0.19	-0.54	0.81	-0.29	-0.44	0.17	0.51	0.40	0.06	0.27	0.41	0.33	-0.01	-0.35	0.00	0.03	-0.21	0.68	0.46	0.33	0.27
Earnings Per Share Diluted		0.40	0.55	0.35	-0.45	-0.93	0.96	1.07	0.35	0.08	0.19	1.22	0.71	-0.93	0.66	-0.51	0.59	1.43	1.79	1.71	1.69	1.28	1.57	1.43	1.03	5.46	1.01	0.95	0.65	-5.22	0.79	0.77	0.52	0.78	0.71	0.61	0.18	-0.54	0.79	-0.29	-0.44	0.17	0.50	0.39	0.06	0.27	0.40	0.33	-0.01	-0.35	0.00	0.03	-0.21	0.67	0.45	0.33	0.26

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Revenue From Contract With Customer Including Assessed Tax		751.79	766.17	725.64	691.83	681.25	789.44	799.09	735.15	777.16	744.78	656.99	534.55	589.64	457.49	350.04	729.94	743.59	760.29	744.38	723.69	803.49	829.27	805.51	783.40	771.24	812.67	791.51	747.17	758.02	799.78	801.34	762.08	752.74	794.00	788.42	760.40	813.85	834.63	816.57	772.39	804.37	850.74	839.13	803.49	810.73	865.26	937.21	921.17	899.85	955.42	933.70	865.95	796.28	686.86	649.76	632.24
Revenues		751.79	766.17	725.64	691.83	681.25	789.44	799.09	735.15	777.16	744.78	656.99	534.55	589.64	457.49	350.04	729.94	743.59	760.29	744.38	723.69	803.49	829.27	805.51	783.40	771.24	812.67	791.51	747.17	758.02	799.78	801.34	762.08	752.74	794.00	788.42	760.40	813.85	834.63	816.57	772.39	804.37	850.74	839.13	803.49	810.73	865.26	937.21	921.17	899.85	955.42	933.70	865.95	796.28	686.86	649.76	632.24
Operating Expenses		724.16	716.88	693.78	696.53	716.31	713.87	710.48	683.10	744.21	697.73	541.97	453.71	617.31	382.94	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Operating Income Loss		27.62	49.29	31.86	-4.70	-35.06	75.58	88.60	52.05	32.95	47.05	115.02	80.84	-27.67	74.55	-4.40	66.32	125.31	146.44	144.09	96.42	121.50	137.93	126.68	88.17	92.94	112.37	106.60	76.30	-404.46	85.83	84.14	61.81	52.21	78.30	69.93	34.08	-19.70	59.08	13.24	-27.77	30.82	56.17	50.55	15.56	43.75	54.97	46.81	20.46	-4.99	26.83	19.04	0.23	51.84	58.28	49.29	42.42
Interest Expense		31.05	32.54	33.72	33.62	34.77	33.28	30.43	28.59	28.85	28.98	33.94	31.35	31.89	30.15	30.93	30.20	30.87	31.61	32.77	32.51	33.92	31.44	28.81	26.23	26.21	27.10	27.06	24.55	22.30	19.86	18.29	17.73	19.39	19.91	18.08	18.46	17.30	16.88	16.14	15.68	16.17	17.00	17.53	17.96	18.74	19.47	19.39	19.78	20.02	20.09	20.05	20.22	21.63	21.64	21.66	NA
Interest Paid Net		30.09	32.06	32.29	33.84	33.09	32.03	30.36	29.84	28.52	29.63	35.12	31.65	29.44	54.12	10.47	31.41	31.63	32.32	33.49	34.29	32.66	30.85	28.28	26.48	27.72	26.97	26.90	24.04	22.27	18.43	19.34	16.55	24.54	18.59	22.25	15.28	21.01	13.65	19.98	13.12	20.84	13.85	22.03	14.60	23.55	15.60	23.97	15.29	24.25	15.57	25.06	16.31	26.64	16.60	NA	NA
Income Tax Expense Benefit		6.92	0.87	2.22	-4.05	-14.57	8.38	18.80	7.03	0.71	4.53	19.38	14.09	-12.93	12.55	-7.53	9.09	25.26	27.40	27.28	26.26	23.75	26.88	22.47	12.84	-221.69	32.96	30.39	17.62	-155.98	25.24	26.09	17.42	25.31	23.50	21.07	6.63	-8.64	27.01	9.74	-20.29	6.48	17.97	12.99	2.13	11.61	11.98	11.69	-0.54	-9.81	-2.22	-3.34	-7.47	14.26	13.78	11.98	NA
Income Taxes Paid Net		4.43	6.28	2.37	0.53	0.81	0.14	0.10	0.12	0.21	5.92	0.30	0.16	1.41	0.07	0.18	0.13	0.07	0.70	0.06	1.65	0.28	0.53	1.37	0.49	2.66	1.76	0.12	0.48	0.27	0.20	0.06	0.68	3.61	0.88	0.04	0.57	1.58	0.10	-0.07	0.45	1.17	1.63	0.49	0.39	0.09	0.04	-1.42	-0.05	-2.53	-0.37	0.23	0.47	-17.28	-0.11	NA	NA
Comprehensive Income Net Of Tax		18.02	24.10	16.93	-20.59	-46.34	45.75	52.01	17.73	4.33	9.68	61.99	35.90	-46.45	33.35	-25.41	29.99	72.53	91.34	88.05	88.21	67.09	83.04	75.94	54.31	289.88	53.73	50.49	34.83	-270.27	41.31	40.46	27.11	40.24	36.43	31.25	9.92	-28.43	39.99	-14.70	-22.86	8.73	26.82	20.16	3.30	13.74	20.65	17.14	-0.30	-19.29	0.75	2.04	-10.59	NA	NA	NA	NA
Net Income Loss Available To Common Stockholders Basic		17.52	23.48	15.42	-22.07	-47.10	48.37	53.95	17.73	4.33	9.68	61.99	35.90	-46.45	33.66	-25.71	29.99	72.53	91.34	88.05	88.18	67.11	83.05	75.86	54.36	289.93	53.72	50.48	34.79	-270.24	41.32	40.24	27.09	40.45	36.27	31.48	9.62	-27.87	41.34	-14.74	-22.89	8.61	26.39	20.72	3.23	13.95	20.93	16.96	-0.68	-17.97	0.12	1.58	-11.06	37.21	25.47	18.66	15.01

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Assets		7026.29	7059.12	7115.77	7233.76	7414.55	7454.20	7336.65	7148.96	7125.95	6940.50	6991.76	6894.69	6887.62	6758.59	6773.38	6661.41	6657.13	6597.66	6580.02	6544.53	6313.21	6184.86	5913.09	5600.19	5458.28	5389.45	5360.61	5128.36	5137.25	5299.76	4996.89	4813.06	4802.89	4926.44	4838.55	4613.51	4409.93	4397.63	4279.84	4202.03	4233.22	4265.39	4240.07	4220.39	4254.64	4248.85	4238.81	4265.66	4281.91	4336.81	4339.74	4399.32	4446.51	NA	NA	NA
Liabilities And Stockholders Equity		7026.29	7059.12	7115.77	7233.76	7414.55	7454.20	7336.65	7148.96	7125.95	6940.50	6991.76	6894.69	6887.62	6758.59	6773.38	6661.41	6657.13	NA	6580.02	6544.53	6313.21	6184.86	5913.09	5600.19	5458.28	5389.45	5360.61	5128.36	5137.25	5299.76	4996.89	4813.06	4802.89	4926.44	4838.55	4613.51	4409.93	4397.63	4279.84	4202.03	4233.22	4265.39	4240.07	4220.39	4254.64	4248.85	4238.81	4265.66	4281.91	4336.81	4339.74	NA	4446.51	NA	NA	NA
Stockholders Equity		2113.50	2136.70	2157.24	2232.06	2347.63	2395.95	2345.03	2289.72	2267.51	2261.81	2248.91	2181.52	2139.55	2185.10	2142.96	2163.44	2175.01	2116.26	2052.24	2000.57	1964.28	1928.87	1860.65	1787.14	1754.32	1475.71	1422.54	1373.82	1350.94	1624.11	1577.35	1535.90	1506.43	1461.70	1423.21	1410.55	1400.35	1429.07	1388.29	1409.22	1434.94	1427.45	1411.22	1392.16	1387.17	1372.41	1350.63	1334.41	1334.26	1358.86	NA	NA	1420.92	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Assets Current		1131.90	1162.00	1183.13	1251.97	1371.28	1262.19	1216.88	1071.97	1068.59	1096.67	1130.83	998.78	982.80	977.28	945.85	768.97	760.35	NA	779.93	781.39	1020.79	1052.07	975.23	952.62	995.13	994.13	947.01	916.59	1047.08	1124.84	1028.02	984.69	1017.57	1358.38	1331.09	1284.67	1291.00	1337.09	1315.72	1409.77	1464.44	1479.60	1436.09	1413.12	1434.04	1392.44	1323.76	1300.01	1280.46	1329.84	1325.00	NA	1369.57	NA	NA	NA
Cash And Cash Equivalents At Carrying Value		148.28	125.33	114.43	74.52	102.98	38.85	96.07	246.00	258.42	271.83	345.85	231.00	215.72	418.23	452.25	289.54	87.21	307.91	253.66	290.88	328.38	324.56	175.73	251.45	181.79	98.08	143.45	95.44	146.77	49.77	227.98	246.76	203.03	126.74	171.16	91.11	132.28	151.39	69.79	82.60	170.64	267.75	140.55	143.07	133.77	136.46	108.71	98.95	129.53	84.60	139.13	127.74	112.34	82.77	59.18	NA
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents		148.28	125.33	114.43	74.52	102.98	38.85	96.07	246.00	258.42	271.83	345.85	231.00	215.72	418.23	452.25	NA	87.21	NA	NA	NA	328.38	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Receivables Net Current		82.90	NA	NA	NA	100.50	NA	NA	NA	65.30	NA	NA	NA	34.50	NA	NA	NA	83.00	NA	NA	78.37	64.19	62.23	71.24	61.33	42.73	40.34	38.02	38.56	46.92	49.65	62.38	80.05	62.16	64.70	71.83	71.82	83.10	92.66	118.58	121.13	111.19	94.81	86.89	135.83	130.10	126.81	139.26	146.23	130.51	133.06	143.86	NA	110.21	NA	NA	NA
Other Assets Current		86.70	96.52	92.51	92.65	100.33	66.43	51.10	37.44	38.74	29.08	21.26	23.29	27.32	26.46	24.58	30.13	35.55	NA	17.22	24.92	26.61	53.04	34.55	30.23	26.94	30.42	18.30	24.68	18.11	27.90	12.80	17.95	18.36	34.31	24.84	21.45	16.31	24.80	18.88	18.71	27.39	27.80	23.35	23.11	30.60	31.60	31.22	37.42	31.41	29.86	27.28	NA	32.31	NA	NA	NA
Available For Sale Securities Debt Securities		686.95	NA	NA	NA	944.23	NA	NA	NA	601.99	NA	NA	NA	610.18	NA	NA	NA	432.97	NA	NA	NA	360.94	NA	NA	NA	503.50	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Property Plant And Equipment Gross		8682.79	8619.97	8530.67	8519.25	8432.56	8572.43	8414.94	8354.42	8229.66	7906.87	7956.27	7876.78	7818.04	7558.80	7559.97	7497.32	7393.06	NA	7108.38	7005.25	6767.47	6555.38	6264.02	5908.55	5650.48	5547.47	5496.35	5302.97	5140.01	6112.50	5831.09	5624.35	5556.73	5501.54	5380.79	5149.51	4923.56	4828.01	4674.36	4463.17	4400.85	4364.02	4329.18	4287.72	4272.01	4273.30	4280.61	4277.52	4264.32	4205.52	4155.78	NA	4115.61	NA	NA	NA
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment		3199.82	3121.55	3039.53	2957.80	2884.08	2933.66	2854.97	2825.60	2731.06	2621.41	2671.94	2563.12	2455.99	2351.05	2233.28	2103.59	1998.38	NA	1817.33	1730.68	1761.73	1680.12	1604.81	1533.35	1467.47	1405.21	1361.84	1374.67	1318.31	2218.39	2173.64	2121.77	2085.98	2029.91	1975.39	1930.11	1902.38	1869.30	1835.39	1797.99	1749.06	1699.77	1651.38	1608.54	1561.02	1525.44	1483.38	1435.40	1380.85	1327.67	1278.12	NA	1172.80	NA	NA	NA
Property Plant And Equipment Net		5482.97	5498.43	5491.14	5561.46	5548.48	5638.77	5559.98	5528.82	5498.60	5285.46	5284.33	5313.66	5362.05	5207.75	5326.70	5393.74	5394.68	NA	5291.05	5274.57	5005.74	4875.27	4659.20	4375.20	4183.00	4142.26	4134.52	3928.30	3821.70	3894.11	3657.45	3502.57	3470.75	3471.63	3405.40	3219.40	3021.19	2958.70	2838.97	2665.19	2651.79	2664.25	2677.80	2679.18	2711.00	2747.87	2797.24	2842.12	2883.47	2877.85	2877.66	NA	2942.82	NA	NA	NA
Other Assets Noncurrent		324.70	398.70	348.69	323.96	342.86	NA	NA	NA	320.24	NA	NA	NA	260.41	277.13	190.82	172.01	166.09	NA	172.34	146.67	104.84	68.16	71.19	69.18	49.22	42.47	44.54	43.69	41.72	52.85	51.81	54.26	74.89	85.37	90.44	97.25	84.99	88.52	111.27	112.64	101.99	105.98	110.05	111.39	92.35	90.73	99.45	104.59	98.47	109.06	116.46	NA	112.38	NA	NA	NA
Available For Sale Debt Securities Amortized Cost Basis		686.52	NA	NA	NA	949.26	NA	NA	NA	601.99	NA	NA	NA	610.18	NA	NA	NA	432.97	NA	NA	NA	360.99	NA	NA	NA	503.73	NA	NA	NA	410.01	NA	NA	NA	286.89	NA	NA	NA	415.73	NA	NA	NA	489.25	NA	NA	NA	559.41	NA	NA	NA	501.18	NA	NA	NA	675.48	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Liabilities Current		1254.29	1205.67	1165.99	1152.10	1172.54	1159.89	1198.41	1142.29	1194.62	1137.76	1109.36	950.44	941.72	859.90	986.19	1019.84	924.68	NA	927.33	945.33	924.83	913.45	878.60	837.82	820.83	799.13	779.09	750.51	747.26	759.62	740.79	729.38	751.39	734.13	744.72	697.07	684.36	659.91	645.83	636.19	620.46	604.16	585.95	587.13	591.42	600.07	630.02	634.24	624.15	625.50	585.95	NA	562.64	NA	NA	NA
Long Term Debt Current		443.87	443.19	442.15	443.33	438.50	429.43	425.00	410.12	391.80	359.89	360.97	357.46	402.16	360.29	309.16	364.58	364.13	NA	345.25	362.80	350.21	357.33	353.74	335.43	309.68	303.42	306.85	293.64	305.46	300.14	276.90	274.32	272.03	264.85	263.73	232.46	211.82	202.07	192.41	181.38	177.39	174.96	173.20	172.76	171.45	175.42	205.52	203.94	208.40	199.34	160.49	NA	159.04	NA	NA	NA
Accounts Payable Current		470.25	486.73	457.31	452.21	422.00	381.40	437.84	412.76	496.33	427.90	299.76	315.24	278.68	244.05	322.46	407.29	284.47	NA	321.25	340.19	331.98	320.43	291.01	290.14	288.90	276.31	265.03	263.53	241.22	248.18	256.13	261.04	279.86	265.81	278.02	270.62	270.10	252.18	260.44	269.31	245.52	231.38	217.65	227.13	222.67	225.15	231.20	240.10	220.78	236.27	233.04	NA	206.49	NA	NA	NA
Other Liabilities Current		99.88	42.28	35.92	33.47	33.55	43.63	45.30	56.60	48.15	94.50	200.00	45.83	26.12	25.09	138.00	32.20	32.41	NA	35.00	36.84	65.01	63.19	56.65	50.54	48.65	45.64	44.02	44.96	45.09	45.39	43.07	42.97	40.80	43.80	40.54	45.07	42.77	45.76	41.03	43.79	37.44	41.25	37.13	40.57	39.59	43.10	38.98	43.84	38.51	40.56	35.35	NA	42.46	NA	NA	NA
Contract With Customer Liability Current		61.00	10.00	7.30	5.60	5.20	1.70	20.80	33.00	24.50	70.50	60.50	19.90	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Long Term Debt Noncurrent		2562.18	2633.71	2743.80	2855.52	2941.77	2982.03	2864.48	2791.27	2717.42	2605.06	2652.26	2748.72	2801.54	2707.77	2664.12	2537.61	2628.99	NA	2719.04	2734.32	2809.77	2751.72	2615.64	2440.77	2377.35	2380.79	2452.66	2321.27	2240.05	1924.99	1762.92	1664.77	1676.78	1842.86	1800.45	1676.91	1533.99	1467.51	1377.31	1285.54	1293.18	1349.21	1382.85	1437.63	1470.57	1526.46	1525.27	1577.77	1606.99	1626.33	1658.12	NA	1738.94	NA	NA	NA
Deferred Finance Costs Noncurrent Net		20.59	21.68	22.87	24.06	25.18	26.42	26.91	27.45	28.15	28.13	28.94	31.21	28.46	29.70	20.21	21.09	20.58	NA	20.58	20.76	21.60	21.91	21.67	21.38	21.76	22.20	23.13	NA	21.91	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Deferred Income Tax Liabilities Net		687.60	681.58	682.69	681.55	687.06	683.83	679.79	669.03	663.24	657.07	656.26	639.05	625.93	638.94	625.50	633.11	623.58	NA	569.44	NA	518.16	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Other Liabilities Noncurrent		341.32	334.95	292.15	236.11	176.93	114.68	114.33	108.66	124.88	107.37	137.12	174.37	173.04	145.04	116.04	48.37	45.63	NA	46.45	48.04	66.87	62.68	62.00	62.36	42.54	46.57	47.56	50.39	50.84	52.82	52.47	54.28	56.19	50.05	48.60	48.83	49.62	47.73	73.61	73.47	76.31	75.54	59.13	57.63	57.42	54.28	48.77	48.82	50.19	51.46	51.77	NA	46.33	NA	NA	NA
Operating Lease Liability Noncurrent		67.39	66.52	73.89	76.42	88.62	117.82	134.60	147.99	158.27	171.44	187.86	200.60	205.84	221.84	238.57	259.04	259.24	NA	265.52	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Stockholders Equity		2113.50	2136.70	2157.24	2232.06	2347.63	2395.95	2345.03	2289.72	2267.51	2261.81	2248.91	2181.52	2139.55	2185.10	2142.96	2163.44	2175.01	2116.26	2052.24	2000.57	1964.28	1928.87	1860.65	1787.14	1754.32	1475.71	1422.54	1373.82	1350.94	1624.11	1577.35	1535.90	1506.43	1461.70	1423.21	1410.55	1400.35	1429.07	1388.29	1409.22	1434.94	1427.45	1411.22	1392.16	1387.17	1372.41	1350.63	1334.41	1334.26	1358.86	NA	NA	1420.92	NA	NA	NA
Common Stocks Including Additional Paid In Capital		754.36	750.13	744.28	740.03	734.43	736.41	731.21	727.90	722.31	720.93	717.71	712.32	704.67	703.78	695.00	690.07	686.81	NA	680.80	692.59	690.91	688.17	682.54	679.77	672.59	668.97	664.92	662.34	657.35	657.66	649.62	645.91	641.64	635.22	631.08	628.88	626.52	624.81	621.96	620.80	618.51	617.70	NA	NA	609.76	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Retained Earnings Accumulated Deficit		2271.21	2253.70	2230.22	2214.80	2236.87	2283.97	2235.60	2181.65	2163.92	2159.58	2149.90	2087.91	2052.01	2098.46	2064.79	2090.51	2079.18	NA	1927.41	1845.47	1776.59	1714.62	1636.77	1566.11	1516.96	1231.17	1181.60	1135.27	1103.75	1376.59	1337.85	1300.18	1275.14	1236.63	1202.44	1173.03	1165.48	1195.35	1156.07	1172.87	1197.82	1191.27	1166.92	1148.28	1147.12	1135.23	1116.35	1101.42	1104.14	1124.07	1126.11	NA	1139.74	NA	NA	NA
Accumulated Other Comprehensive Income Loss Net Of Tax		0.33	-0.18	-0.81	-2.32	-3.80	-4.57	-1.95	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	-0.03	-0.02	-0.02	-0.10	-0.05	-0.00	-0.01	-0.03	-0.07	-0.04	-0.03	-0.10	-0.26	-0.05	-0.21	0.01	-0.29	0.27	1.62	1.58	1.56	1.44	1.01	1.57	1.51	1.71	2.00	1.82	1.44	2.77	2.13	NA	1.20	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Net Cash Provided By Used In Operating Activities		224.43	178.88	182.82	150.20	136.84	128.26	194.77	20.51	144.87	188.27	267.10	231.59	84.86	56.42	222.80	269.48	138.56	220.34	207.21	154.91	229.41	222.31	184.93	165.90	151.84	200.51	187.84	143.94	107.35	171.28	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Net Cash Provided By Used In Investing Activities		-84.23	-8.99	66.96	3.03	-40.33	-307.98	-431.92	-124.67	-301.74	-214.40	-60.97	-121.41	-422.02	-190.82	-125.61	54.99	-351.74	-56.24	-172.14	-76.91	-241.05	-194.62	-447.66	-100.07	-56.28	-166.71	-279.43	-248.91	-326.35	-537.54	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Net Cash Provided By Used In Financing Activities		-117.25	-159.00	-209.87	-181.69	-32.38	122.50	87.22	91.74	143.46	-47.89	-91.27	-94.90	134.66	100.39	65.51	-122.13	-7.53	-109.85	-72.29	-115.51	15.46	121.15	187.01	3.83	-11.85	-79.16	139.59	53.65	316.00	188.04	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Net Cash Provided By Used In Operating Activities		224.43	178.88	182.82	150.20	136.84	128.26	194.77	20.51	144.87	188.27	267.10	231.59	84.86	56.42	222.80	269.48	138.56	220.34	207.21	154.91	229.41	222.31	184.93	165.90	151.84	200.51	187.84	143.94	107.35	171.28	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Depreciation Depletion And Amortization		95.24	96.56	97.17	94.15	97.12	97.43	97.25	102.75	111.11	109.60	109.89	109.60	110.15	121.47	131.64	111.71	95.17	92.80	90.15	89.99	88.20	86.09	82.71	77.58	77.35	74.09	71.21	70.11	75.54	71.74	69.89	67.80	67.55	66.60	64.66	65.69	67.25	65.82	64.25	62.32	61.70	61.13	61.17	61.00	60.76	62.70	64.18	64.31	63.90	63.39	63.70	63.19	61.20	58.77	58.38	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Net Cash Provided By Used In Investing Activities		-84.23	-8.99	66.96	3.03	-40.33	-307.98	-431.92	-124.67	-301.74	-214.40	-60.97	-121.41	-422.02	-190.82	-125.61	54.99	-351.74	-56.24	-172.14	-76.91	-241.05	-194.62	-447.66	-100.07	-56.28	-166.71	-279.43	-248.91	-326.35	-537.54	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Payments To Acquire Property Plant And Equipment		-0.72	2.64	1.02	10.32	1.67	1.84	7.29	2.24	7.65	1.77	4.48	4.22	3.28	0.70	5.15	3.54	19.57	5.16	3.79	52.08	-1.47	16.80	9.77	9.30	19.19	5.86	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Payments To Acquire Productive Assets		81.72	48.25	26.02	107.92	112.47	221.09	201.18	127.58	319.79	163.30	26.44	57.51	272.16	4.94	72.26	111.12	194.24	101.99	135.66	414.58	202.21	321.57	364.72	267.79	117.00	53.50	295.80	223.10	527.94	309.10	222.67	99.29	42.52	149.50	253.80	269.14	190.56	192.83	242.36	73.52	47.46	30.87	33.42	30.29	33.77	16.18	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Net Cash Provided By Used In Financing Activities		-117.25	-159.00	-209.87	-181.69	-32.38	122.50	87.22	91.74	143.46	-47.89	-91.27	-94.90	134.66	100.39	65.51	-122.13	-7.53	-109.85	-72.29	-115.51	15.46	121.15	187.01	3.83	-11.85	-79.16	139.59	53.65	316.00	188.04	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

		2023-12-31	2023-09-30	2023-06-30	2023-03-31	2022-12-31	2022-09-30	2022-06-30	2022-03-31	2021-12-31	2021-09-30	2021-06-30	2021-03-31	2020-12-31	2020-09-30	2020-06-30	2020-03-31	2019-12-31	2019-09-30	2019-06-30	2019-03-31	2018-12-31	2018-09-30	2018-06-30	2018-03-31	2017-12-31	2017-09-30	2017-06-30	2017-03-31	2016-12-31	2016-09-30	2016-06-30	2016-03-31	2015-12-31	2015-09-30	2015-06-30	2015-03-31	2014-12-31	2014-09-30	2014-06-30	2014-03-31	2013-12-31	2013-09-30	2013-06-30	2013-03-31	2012-12-31	2012-09-30	2012-06-30	2012-03-31	2011-12-31	2011-09-30	2011-06-30	2011-03-31	2010-12-31	2010-09-30	2010-06-30	2010-03-31
Revenues		751.79	766.17	725.64	691.83	681.25	789.44	799.09	735.15	777.16	744.78	656.99	534.55	589.64	457.49	350.04	729.94	743.59	760.29	744.38	723.69	803.49	829.27	805.51	783.40	771.24	812.67	791.51	747.17	758.02	799.78	801.34	762.08	752.74	794.00	788.42	760.40	813.85	834.63	816.57	772.39	804.37	850.74	839.13	803.49	810.73	865.26	937.21	921.17	899.85	955.42	933.70	865.95	796.28	686.86	649.76	632.24
Revenue From Contract With Customer Including Assessed Tax		751.79	766.17	725.64	691.83	681.25	789.44	799.09	735.15	777.16	744.78	656.99	534.55	589.64	457.49	350.04	729.94	743.59	760.29	744.38	723.69	803.49	829.27	805.51	783.40	771.24	812.67	791.51	747.17	758.02	799.78	801.34	762.08	752.74	794.00	788.42	760.40	813.85	834.63	816.57	772.39	804.37	850.74	839.13	803.49	810.73	865.26	937.21	921.17	899.85	955.42	933.70	865.95	796.28	686.86	649.76	632.24
Airport Customer Service And Other Revenue		6.99	8.18	8.46	11.43	9.93	10.00	8.86	10.53	7.95	7.95	7.57	8.41	6.41	5.31	4.18	9.90	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Capacity Purchase Agreements Fixed Aircraft Lease Revenue		73.73	73.79	74.04	74.48	116.95	133.99	129.50	124.08	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Capacity Purchase Agreements Variable Aircraft Lease Revenue		45.63	46.49	44.98	43.10	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Flying Agreements		728.27	741.90	700.39	663.84	654.49	763.51	773.77	708.06	751.83	719.08	632.97	511.19	569.89	445.05	336.37	709.49	725.09	738.84	725.34	700.00	791.86	816.06	793.64	767.96	761.08	800.97	781.72	734.53	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Lease Airport Service And Other		23.52	24.27	25.25	27.99	26.76	25.93	25.31	27.09	25.33	25.70	24.02	23.36	19.75	12.45	13.67	20.44	18.50	21.46	19.05	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Lease Airport Services And Other		23.52	24.27	25.25	27.99	26.76	25.93	25.31	27.09	25.33	25.70	24.02	23.36	19.75	12.45	13.67	20.44	18.50	21.46	19.05	23.69	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Prorate Agreements		112.15	109.68	82.23	77.34	80.69	94.74	94.73	79.17	109.49	128.31	103.23	68.65	71.52	60.78	36.21	100.35	134.12	145.83	134.93	106.08	125.08	134.29	129.51	109.87	110.20	124.17	113.70	90.35	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Sky West Airlines		610.75	626.78	586.48	568.17	573.57	651.49	664.20	603.05	644.01	614.38	527.60	406.45	464.14	337.98	227.81	606.84	623.88	641.95	627.09	585.77	595.42	607.05	587.48	556.29	548.75	558.99	519.71	464.92	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Skywest Leasing		141.04	139.39	139.17	123.66	107.67	137.95	134.88	132.10	133.15	130.41	129.40	128.10	125.50	119.52	122.23	123.09	119.71	118.35	117.30	113.88	88.81	82.07	74.33	66.03	63.84	62.31	59.98	53.80	45.22	36.81	30.99	27.97	18.59	25.22	19.34	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA

Plots across concepts

Line plots across dimensions of each concept