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Tables

		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	2013-03-30	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
Common Stock Value		0.24	0.24	0.25	0.24	0.24	0.25	0.25	0.25	0.25	0.25	0.25	0.24	0.24	0.22	0.22	0.22	0.22	0.22	0.22	0.22	0.22	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	NA	0.11	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.13	NA	NA	NA
Weighted Average Number Of Diluted Shares Outstanding		23.87	23.96	23.43	NA	23.90	24.06	24.11	NA	24.11	24.13	24.15	NA	23.21	22.01	22.07	NA	22.13	22.11	22.05	NA	17.80	11.38	11.31	NA	11.21	11.19	11.12	NA	10.83	10.80	10.78	NA	10.74	10.71	10.74	NA	10.66	10.62	10.58	NA	10.55	10.54	10.85	NA	NA	11.49	0.01	11.48	NA	11.65	11.74	12.79	NA	13.56	13.70	13.73
Weighted Average Number Of Shares Outstanding Basic		23.36	23.45	23.43	NA	23.55	23.80	23.95	NA	23.95	23.98	23.97	NA	23.00	21.76	21.81	NA	21.81	21.78	21.50	NA	17.80	10.88	10.74	NA	10.70	10.68	10.63	NA	10.62	10.61	10.60	NA	10.59	10.59	10.58	NA	10.57	10.56	10.53	NA	10.51	10.50	10.81	NA	NA	11.43	0.01	11.42	NA	11.62	11.69	12.74	NA	13.47	13.56	13.60
Earnings Per Share Basic		0.79	0.61	-0.09	0.78	0.26	0.64	0.29	0.91	0.16	0.83	0.40	0.25	0.48	1.57	1.62	1.31	0.77	1.12	0.53	1.05	-2.97	0.48	0.88	-0.61	0.58	0.96	1.00	1.10	0.27	0.73	1.17	1.23	0.35	1.12	1.08	1.22	0.47	1.29	1.40	-1.80	0.30	1.43	1.59	1.59	1.47	0.36	1.86	2.10	2.31	1.20	2.54	2.81	2.74	1.73	2.63	2.68
Earnings Per Share Diluted		0.77	0.59	-0.09	0.76	0.25	0.63	0.29	0.90	0.16	0.83	0.40	0.25	0.47	1.55	1.60	1.29	0.75	1.10	0.52	1.02	-2.97	0.46	0.84	-0.61	0.56	0.92	0.95	1.07	0.27	0.72	1.15	1.21	0.35	1.11	1.06	1.21	0.46	1.29	1.40	-1.80	0.30	1.42	1.59	1.59	1.47	0.36	1.85	2.09	2.30	1.20	2.53	2.80	2.73	1.72	2.60	2.65

		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	2013-03-30	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 Excluding Assessed Tax		285.94	287.68	256.61	269.94	263.12	273.56	258.86	272.10	270.08	299.17	290.34	267.49	239.03	255.83	265.30	263.77	241.75	245.11	246.51	242.10	160.94	114.67	116.47	118.71	108.51	112.72	114.91	119.28	102.16	108.49	111.17	113.66	99.14	109.75	111.89	116.07	100.76	112.75	116.47	124.08	110.03	131.98	137.51	137.51	141.93	124.26	146.25	149.53	155.82	135.87	163.79	171.96	171.95	147.60	159.28	157.90
Revenues		285.94	287.68	256.61	269.94	263.12	273.56	258.86	272.10	270.08	299.17	290.34	267.49	239.03	255.83	265.30	263.77	241.75	245.11	246.51	242.10	160.94	114.67	116.47	118.71	108.51	112.72	114.91	119.28	102.16	108.49	111.17	113.66	99.14	109.75	111.89	116.07	100.76	112.75	116.47	124.08	110.03	131.98	137.51	137.51	141.93	124.26	146.25	149.53	155.82	135.87	163.79	171.96	171.95	147.60	159.28	157.90
Operating Costs And Expenses		155.74	161.48	152.94	152.17	153.16	147.37	144.62	148.87	153.65	152.94	152.81	147.01	127.17	125.54	132.94	133.32	132.53	130.70	134.05	130.71	93.29	64.69	63.78	65.12	59.76	63.65	61.42	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
Costs And Expenses		260.31	270.86	257.95	242.29	255.32	251.70	245.41	244.24	262.73	272.47	278.34	263.89	223.60	209.44	221.34	226.56	221.75	217.51	220.78	223.23	218.07	110.48	105.14	107.02	100.29	98.87	96.47	99.62	97.33	95.59	91.07	92.00	91.89	88.82	92.03	93.45	91.54	88.75	90.56	154.18	103.41	105.72	107.59	NA	113.21	116.42	110.09	108.67	NA	NA	NA	NA	NA	NA	NA	NA
General And Administrative Expense		97.60	99.00	95.47	90.56	97.75	96.72	94.78	85.39	95.71	93.39	86.84	84.64	74.07	67.30	69.23	67.59	72.30	68.37	64.14	68.54	15.81	11.06	11.22	19.38	11.19	13.21	11.62	12.52	10.95	11.93	10.33	10.83	10.93	10.84	11.65	11.64	11.03	11.16	11.01	29.10	11.47	12.98	11.09	NA	10.71	13.77	12.93	12.65	12.96	13.41	14.58	14.52	59.70	13.38	13.81	14.69
Operating Income Loss		25.63	16.82	-1.35	27.65	7.81	21.86	13.44	27.86	7.35	26.70	12.00	3.61	15.42	46.40	43.96	37.21	20.00	27.60	25.72	18.88	-57.13	4.18	11.33	11.69	8.22	13.85	18.44	19.65	4.83	12.90	20.09	21.66	7.25	20.93	19.86	22.62	9.22	24.00	25.91	-30.10	6.62	26.26	29.92	29.92	28.73	7.84	36.17	40.86	45.37	24.41	50.15	59.23	58.91	38.25	58.69	59.93
Income Tax Expense Benefit		8.01	5.76	1.08	9.26	1.45	6.95	5.24	7.79	1.65	7.48	4.59	-2.41	5.37	13.88	10.84	11.17	6.55	7.31	17.55	-1.82	-3.24	-0.56	2.15	18.36	2.14	3.65	7.89	7.91	1.91	5.06	7.61	8.52	2.43	7.88	7.28	8.45	2.99	9.04	9.77	-12.53	2.08	9.92	11.39	NA	10.86	2.68	13.85	15.66	17.49	9.27	19.36	23.37	23.43	15.24	23.28	23.79
Income Taxes Paid		8.90	22.90	3.80	6.60	6.40	13.30	0.50	5.50	4.80	16.60	0.40	13.00	16.20	15.50	0.70	12.20	11.90	24.00	0.70	2.50	4.20	6.60	0.10	4.40	5.60	16.00	0.20	6.60	6.80	14.50	3.70	7.50	7.40	13.40	0.20	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Net Income Loss		18.46	14.23	-2.03	18.33	6.09	15.22	7.03	21.68	3.85	19.98	9.58	5.92	10.96	34.15	35.24	28.54	16.69	24.41	11.50	22.45	-52.78	5.19	9.47	-6.50	6.23	10.30	10.58	11.72	2.88	7.79	12.42	13.04	3.72	11.87	11.38	12.94	4.95	13.68	14.78	-18.96	3.15	15.00	17.23	17.23	16.63	4.10	21.21	23.99	26.67	13.94	29.65	35.79	35.88	23.34	35.66	36.38
Comprehensive Income Net Of Tax		6.67	7.45	-11.26	49.63	-32.27	-41.97	27.01	28.93	-25.01	10.73	0.76	54.04	11.06	34.56	35.26	28.32	16.69	24.59	11.73	22.51	-52.80	5.19	9.47	-6.50	6.23	NA	NA	11.72	2.88	7.79	12.42	13.04	3.87	11.85	11.18	12.85	5.20	13.51	14.86	-18.91	2.84	15.88	17.37	NA	16.44	4.12	21.31	23.95	26.90	13.74	29.00	35.79	35.63	23.35	35.66	36.36

		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	2013-03-30	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		2114.10	2142.11	2165.77	2161.75	2215.25	2260.26	2367.88	2305.88	2316.12	2363.31	2369.44	2295.81	2047.32	1791.56	1783.82	1789.41	1781.20	1784.57	1775.39	1661.03	1645.70	336.76	331.81	321.28	328.57	318.48	313.97	298.70	286.50	277.55	277.70	248.43	230.27	336.00	327.78	307.81	295.48	282.19	277.61	254.27	240.95	229.82	216.03	NA	227.79	231.61	220.14	224.23	231.13	224.21	217.35	237.62	412.77	NA	NA	NA
Liabilities		519.35	543.51	555.34	525.96	616.77	608.34	643.57	591.89	621.07	630.13	633.52	547.49	342.26	307.01	324.67	326.70	336.54	346.69	351.95	235.81	237.37	112.92	113.52	112.08	113.09	109.28	115.45	110.32	113.28	109.61	119.58	105.58	103.10	215.35	221.41	215.08	217.77	212.23	223.45	215.36	183.99	178.87	183.70	NA	186.80	166.62	150.90	168.21	188.84	180.46	178.99	164.31	236.76	NA	NA	NA
Liabilities And Stockholders Equity		2114.10	2142.11	2165.77	2161.75	2215.25	2260.26	2367.88	2305.88	2316.12	2363.31	2369.44	2295.81	2047.32	1791.56	1783.82	1789.41	1781.20	1784.57	1775.39	1661.03	1645.70	336.76	331.81	321.28	328.57	318.48	313.97	298.70	286.50	277.55	277.70	248.43	230.27	336.00	327.78	307.81	295.48	282.19	277.61	254.27	240.95	229.82	216.03	NA	227.79	231.61	220.14	224.23	231.13	224.21	217.35	237.62	412.77	NA	NA	NA
Stockholders Equity		1594.75	1598.61	1610.43	1635.79	1598.48	1651.92	1724.31	1713.99	1695.06	1733.18	1735.92	1748.32	1705.06	1484.55	1459.15	1462.71	1444.66	1437.88	1423.44	1425.22	1408.33	223.84	218.29	209.20	215.49	209.20	198.53	188.37	173.22	167.94	158.12	142.86	127.18	120.66	106.36	92.73	77.72	69.96	54.17	38.90	56.97	50.95	32.32	NA	40.99	64.99	69.25	56.03	42.29	43.75	38.37	73.30	176.00	192.98	227.16	205.80

		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	2013-03-30	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		350.63	350.91	357.01	329.06	402.75	395.82	417.85	367.79	406.48	393.63	352.93	286.12	806.38	553.50	532.78	524.09	505.61	490.32	456.59	420.36	391.41	214.17	201.42	190.35	186.76	180.05	177.40	160.54	152.70	145.78	144.49	138.80	119.73	225.30	217.58	196.65	182.68	166.48	157.78	127.34	118.32	102.26	85.00	NA	89.66	91.94	84.93	89.39	94.67	91.06	83.79	108.22	286.32	NA	NA	NA
Cash And Cash Equivalents At Carrying Value		167.71	181.02	202.82	213.67	262.76	262.94	293.42	268.92	274.77	261.58	238.29	187.51	717.80	470.32	442.85	419.69	397.09	375.51	352.39	311.73	276.38	171.60	165.87	155.93	150.48	147.87	147.10	129.25	120.50	117.42	117.50	106.89	86.92	195.56	188.28	162.28	150.47	136.08	126.20	94.76	85.22	67.54	50.76	NA	47.52	45.61	48.69	52.70	57.14	57.07	50.56	71.09	64.11	84.12	88.01	91.27
Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents		181.44	198.08	218.81	227.45	278.40	276.36	307.31	279.21	286.83	273.91	252.04	202.02	718.65	471.62	444.19	420.50	397.60	376.02	352.89	312.24	276.90	172.10	166.38	156.45	150.99	148.38	147.60	129.76	NA	NA	NA	107.39	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Marketable Securities Current		28.96	25.47	24.49	9.16	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	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Accounts Receivable Net Current		97.43	82.37	71.86	62.95	81.68	75.94	64.80	51.28	87.12	78.61	63.47	50.17	45.96	41.00	41.34	51.52	50.96	47.34	50.84	55.69	52.53	25.59	25.00	23.12	20.63	20.34	20.32	20.53	18.93	19.05	18.61	18.52	17.06	15.22	14.96	16.94	15.71	15.01	15.48	15.84	19.69	23.34	22.18	NA	23.26	24.11	24.22	23.32	25.01	21.20	22.35	25.71	199.60	NA	NA	NA
Other Assets Current		48.69	52.33	54.05	43.28	46.93	48.09	52.85	40.78	39.78	43.60	44.71	39.46	22.16	19.07	21.76	18.00	17.13	17.66	16.87	15.81	17.37	11.38	10.56	11.29	12.92	10.36	9.98	10.77	10.84	8.41	8.38	13.39	15.74	14.52	14.34	17.43	16.50	15.40	16.09	16.74	12.50	11.38	12.05	NA	14.42	14.26	11.89	13.37	12.13	12.79	10.88	11.41	10.23	NA	NA	NA
Available For Sale Securities Debt Securities		14.47	17.52	20.46	22.28	26.04	26.79	28.06	29.88	30.20	32.10	35.73	37.83	51.12	55.02	63.43	71.51	59.99	65.03	68.35	74.80	71.46	NA	NA	0.00	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

		2023-09-30	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	2013-03-30	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		NA	NA	NA	357.91	NA	NA	NA	387.81	NA	NA	NA	385.78	NA	NA	NA	306.11	NA	NA	NA	300.51	NA	NA	NA	244.06	NA	NA	NA	230.25	NA	NA	NA	219.73	NA	NA	NA	220.23	NA	NA	NA	225.49	NA	NA	NA	NA	217.96	NA	NA	NA	206.19	NA	NA	NA	190.59	NA	NA	NA
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment		NA	NA	NA	225.07	NA	NA	NA	237.22	NA	NA	NA	226.93	NA	NA	NA	189.08	NA	NA	NA	177.83	NA	NA	NA	170.30	NA	NA	NA	157.13	NA	NA	NA	142.59	NA	NA	NA	137.96	NA	NA	NA	131.07	NA	NA	NA	NA	96.44	NA	NA	NA	85.04	NA	NA	NA	74.53	NA	NA	NA
Amortization Of Intangible Assets		3.38	3.45	3.53	3.40	3.52	3.69	3.74	3.76	8.93	19.39	19.41	17.97	15.42	15.42	15.42	15.42	15.42	15.42	15.42	15.42	10.28	0.00	0.00	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
Property Plant And Equipment Net		117.87	121.07	124.30	132.84	136.07	141.74	152.74	150.59	147.25	153.81	164.28	158.85	115.61	117.25	117.28	117.03	116.49	118.46	119.04	122.68	124.61	72.12	73.69	73.76	74.33	72.71	72.80	73.12	71.72	72.58	74.95	77.14	78.59	80.34	80.80	82.27	84.40	87.10	90.53	94.42	109.96	114.20	117.91	NA	121.52	122.62	118.84	119.54	121.15	121.90	120.77	118.96	116.06	NA	NA	NA
Goodwill		1228.43	1237.98	1243.33	1251.28	1226.50	1256.43	1303.17	1285.86	1280.22	1303.86	1311.49	1318.53	732.08	732.08	732.08	732.08	732.08	732.10	732.80	732.54	730.73	17.92	20.74	20.74	20.74	20.74	20.74	20.74	20.79	20.79	21.04	6.80	6.80	6.80	6.80	6.80	6.80	6.80	6.80	6.80	6.80	6.80	6.80	NA	6.80	6.80	6.80	6.80	6.80	NA	NA	NA	NA	NA	NA	NA
Intangible Assets Net Excluding Goodwill		249.51	253.35	256.71	260.54	259.86	266.08	276.27	276.38	278.37	289.99	308.19	326.42	231.51	245.34	259.18	273.01	286.84	300.68	314.51	328.34	342.48	NA	NA	7.26	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 Assets Noncurrent		54.95	54.81	51.18	49.65	50.35	49.30	50.07	52.30	54.42	59.89	60.28	54.93	50.37	30.07	23.57	21.79	20.43	19.78	19.05	19.43	23.14	9.70	12.15	11.97	12.13	12.54	12.91	13.19	13.39	13.89	14.28	5.69	5.69	5.47	5.58	5.86	6.39	6.94	7.52	8.58	5.87	6.57	6.32	NA	6.54	4.64	4.87	5.12	5.19	3.34	3.61	2.17	1.51	NA	NA	NA
Available For Sale Debt Securities Amortized Cost Basis		14.86	18.04	21.03	22.99	26.82	27.32	28.33	29.44	29.46	31.38	35.06	37.01	50.37	54.41	63.38	71.48	59.68	64.72	68.27	75.06	71.80	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
Held To Maturity Securities Debt Maturities Within One Year Fair Value		16.40	16.55	16.73	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	NA

		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	2013-03-30	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		265.49	242.09	241.71	209.94	259.92	235.63	254.84	195.75	255.65	252.19	249.76	200.05	195.29	148.88	160.89	156.75	157.83	153.82	153.52	125.13	116.12	69.20	72.28	69.07	72.30	61.30	66.23	59.84	61.65	59.54	62.49	57.59	57.53	60.47	63.56	56.34	58.76	49.26	55.57	45.16	43.05	35.96	39.42	NA	43.02	71.81	59.20	83.89	77.18	82.89	64.54	71.17	224.12	NA	NA	NA
Accounts Payable And Accrued Liabilities Current		102.12	90.06	93.15	90.59	101.36	85.21	103.93	95.52	103.38	100.12	97.45	104.74	115.83	67.26	81.86	90.83	86.09	86.07	80.08	85.98	78.09	46.66	45.81	46.18	50.51	41.29	38.40	41.13	44.82	42.13	38.11	42.25	44.46	40.73	42.91	43.84	47.71	33.17	38.50	38.53	39.06	31.62	31.08	NA	39.12	40.36	25.76	36.52	34.04	NA	NA	NA	41.79	NA	NA	NA
Taxes Payable Current		NA	NA	2.37	6.99	3.32	4.38	9.42	NA	2.62	4.01	11.35	NA	12.09	16.72	13.73	1.35	0.00	0.00	6.14	0.42	NA	NA	2.54	1.04	NA	NA	8.60	1.88	NA	NA	7.23	2.68	1.05	4.24	8.54	1.29	1.04	7.74	10.94	2.57	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Contract With Customer Liability Current		140.25	128.65	122.98	88.49	131.71	121.03	115.65	73.23	123.91	118.77	108.07	60.50	42.63	40.05	40.49	39.28	45.57	40.92	40.83	38.73	38.02	22.55	23.93	21.85	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

		2023-09-30	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	2013-03-30	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		61.25	101.31	101.34	101.40	141.23	141.44	141.74	141.63	141.59	141.75	141.80	141.82	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	109.38	110.94	112.50	114.06	115.62	117.19	118.75	NA	NA	NA	NA	121.88	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Deferred Income Tax Liabilities Net		28.25	31.34	36.34	34.60	33.69	38.61	39.97	44.59	41.02	42.81	44.26	53.41	34.01	40.11	44.58	47.94	57.02	66.32	70.30	59.36	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
Other Liabilities Noncurrent		42.96	41.79	44.04	46.01	45.14	46.81	48.09	47.09	43.77	45.00	44.72	46.05	36.15	40.56	40.44	1.76	1.99	1.98	1.42	1.26	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	51.46	NA	NA	NA	NA	21.91	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA
Operating Lease Liability Noncurrent		121.39	126.97	131.91	134.01	136.79	145.84	158.93	162.82	139.03	148.38	152.98	106.15	76.80	77.46	78.77	80.56	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

		2023-09-30	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	2013-03-30	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		1594.75	1598.61	1610.43	1635.79	1598.48	1651.92	1724.31	1713.99	1695.06	1733.18	1735.92	1748.32	1705.06	1484.55	1459.15	1462.71	1444.66	1437.88	1423.44	1425.22	1408.33	223.84	218.29	209.20	215.49	209.20	198.53	188.37	173.22	167.94	158.12	142.86	127.18	120.66	106.36	92.73	77.72	69.96	54.17	38.90	56.97	50.95	32.32	NA	40.99	64.99	69.25	56.03	42.29	43.75	38.37	73.30	176.00	192.98	227.16	205.80
Common Stock Value		0.24	0.24	0.25	0.24	0.24	0.25	0.25	0.25	0.25	0.25	0.25	0.24	0.24	0.22	0.22	0.22	0.22	0.22	0.22	0.22	0.22	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	0.11	NA	0.11	0.12	0.12	0.12	0.12	0.12	0.12	0.12	0.13	NA	NA	NA
Additional Paid In Capital Common Stock		1513.02	1509.08	1511.59	1510.92	1507.90	1513.51	1528.33	1529.97	1525.19	1523.02	1521.14	1519.55	1515.66	1291.60	1287.41	1309.44	1306.35	1305.15	1304.17	1306.65	1301.23	53.02	49.77	47.08	44.02	41.11	37.88	35.45	32.02	29.61	27.58	24.74	22.10	19.45	17.00	14.55	12.38	9.83	7.54	7.14	6.29	3.12	0.38	NA	0.30	9.23	5.73	1.94	0.29	6.06	2.44	0.00	1.21	NA	NA	NA
Retained Earnings Accumulated Deficit		144.37	140.37	142.89	159.69	156.70	166.18	166.55	174.57	167.66	179.09	174.47	179.65	188.39	192.07	171.27	152.82	137.64	132.06	118.78	118.32	106.91	170.71	168.41	162.01	171.36	167.98	160.53	152.81	141.09	138.21	130.43	118.01	104.97	101.24	89.37	77.98	65.04	60.09	46.41	31.63	50.59	47.44	32.44	NA	41.31	56.19	63.95	54.62	42.49	38.41	36.45	73.18	174.62	NA	NA	NA
Accumulated Other Comprehensive Income Loss Net Of Tax		-62.88	-51.08	-44.30	-35.07	-66.37	-28.01	29.18	9.20	1.96	30.82	40.06	48.88	0.76	0.66	0.25	0.23	0.45	0.45	0.27	0.03	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	-0.14	-0.12	0.09	0.18	-0.07	0.10	0.03	-0.02	0.29	-0.60	NA	-0.74	-0.55	-0.56	-0.65	-0.61	-0.84	-0.65	0.00	0.04	NA	NA	NA
Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value		4.08	5.49	5.63	5.58	5.61	5.53	5.07	5.43	4.65	4.17	3.90	3.85	3.88	3.86	3.02	3.09	3.02	3.15	2.85	3.96	5.10	3.25	2.69	3.06	2.92	3.23	2.43	3.44	2.40	2.04	2.89	2.64	2.65	2.47	2.45	2.40	2.55	2.55	1.96	0.89	3.17	2.98	2.25	NA	-3.89	3.53	3.44	2.39	3.44	3.47	3.44	2.89	3.00	2.89	3.04	3.06

		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	2013-03-30	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		46.44	5.50	35.24	1.32	44.06	24.08	56.59	19.36	35.33	47.05	78.78	-15.88	46.84	43.25	68.69	60.74	38.34	44.41	58.66	61.51	-44.67	12.98	17.05	11.78	11.61	8.23	24.54	14.40	7.68	7.75	14.68	23.08	10.37	13.06	30.39	15.44	16.92	11.98	33.22	11.93	20.58	20.18	31.39	NA	24.82	14.59	6.18	36.48	31.61	35.32	20.26	67.17	21.38	53.59	24.75	63.11
Net Cash Provided By Used In Investing Activities		-6.71	-0.47	-23.29	-1.04	-9.51	-12.05	-8.76	-12.50	-2.79	-7.01	-10.79	-627.64	-5.40	-2.82	-6.33	-24.51	-4.07	-7.01	-2.47	-16.55	155.28	-4.36	-4.23	-3.48	-6.14	-4.59	-3.84	-5.66	-3.65	-7.82	-3.67	-3.10	-2.53	-4.22	-2.83	-2.84	-1.74	-1.32	-1.00	-1.61	-2.12	-2.63	-2.37	NA	-6.57	-8.29	-5.82	-4.05	-12.10	-6.83	-6.68	1.00	14.22	2.94	-10.67	-12.36
Net Cash Provided By Used In Financing Activities		-54.63	-24.71	-19.72	-57.87	-26.75	-35.91	-21.83	-15.41	-17.74	-17.63	-17.10	125.27	205.59	-13.00	-38.66	-13.33	-12.69	-14.27	-15.53	-9.62	-5.81	-2.89	-2.89	-2.85	-2.85	-2.85	-2.85	0.00	-0.95	0.00	-0.41	0.00	-116.47	-1.56	-1.56	-0.78	-0.78	-0.78	-0.78	-0.78	-0.78	-0.78	-25.78	NA	-16.34	-9.37	-4.37	-36.87	-19.44	-21.98	-34.12	-61.19	-55.61	-60.42	-17.33	-23.44

		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	2013-03-30	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		46.44	5.50	35.24	1.32	44.06	24.08	56.59	19.36	35.33	47.05	78.78	-15.88	46.84	43.25	68.69	60.74	38.34	44.41	58.66	61.51	-44.67	12.98	17.05	11.78	11.61	8.23	24.54	14.40	7.68	7.75	14.68	23.08	10.37	13.06	30.39	15.44	16.92	11.98	33.22	11.93	20.58	20.18	31.39	NA	24.82	14.59	6.18	36.48	31.61	35.32	20.26	67.17	21.38	53.59	24.75	63.11
Net Income Loss		18.46	14.23	-2.03	18.33	6.09	15.22	7.03	21.68	3.85	19.98	9.58	5.92	10.96	34.15	35.24	28.54	16.69	24.41	11.50	22.45	-52.78	5.19	9.47	-6.50	6.23	10.30	10.58	11.72	2.88	7.79	12.42	13.04	3.72	11.87	11.38	12.94	4.95	13.68	14.78	-18.96	3.15	15.00	17.23	17.23	16.63	4.10	21.21	23.99	26.67	13.94	29.65	35.79	35.88	23.34	35.66	36.38
Increase Decrease In Accounts Receivable		15.49	10.73	8.89	-20.76	8.16	12.49	12.67	-38.29	9.54	15.53	13.42	-20.88	5.04	-0.27	-3.55	0.49	3.52	-0.93	-4.85	0.35	-11.14	0.67	2.25	2.80	0.32	0.16	-0.02	1.88	-0.18	0.47	-0.72	1.56	1.99	0.36	-1.91	-2.50	3.83	-0.68	-1.34	-0.45	-3.65	1.16	-1.08	NA	-0.85	-0.11	0.90	-1.69	3.81	-1.15	-3.36	3.70	30.98	2.19	-1.63	2.91
Deferred Income Tax Expense Benefit		-2.91	-4.91	1.87	0.55	-4.30	0.05	-4.96	4.49	-1.70	-1.60	-8.90	-0.56	-6.13	-4.63	-2.11	-9.01	-8.94	-0.93	10.83	-11.88	-2.86	0.26	-1.84	10.16	-2.17	-2.32	0.76	-3.15	-3.38	-1.52	-0.63	-0.59	-1.74	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	1.51	-1.30	NA	NA	3.11	1.20	-1.07	0.82	3.83	-1.13	-1.60	-0.74
Share Based Compensation		4.08	5.49	5.63	5.58	5.61	5.53	5.07	5.43	4.65	4.17	3.90	3.85	3.88	3.86	3.02	3.08	2.50	3.57	3.01	3.75	5.84	3.25	2.69	3.06	2.91	3.23	2.43	3.44	2.40	2.04	2.89	2.64	2.65	2.47	2.45	2.40	2.55	2.55	1.96	0.89	3.17	2.98	2.25	NA	-3.89	3.53	3.44	2.39	3.44	3.47	3.44	2.89	3.00	2.89	3.04	3.06
Amortization Of Financing Costs		0.14	0.14	0.14	0.14	0.14	0.14	0.14	0.14	0.14	0.14	0.14	0.22	0.08	0.08	0.08	0.08	0.08	0.08	0.08	0.08	0.08	0.07	0.07	0.07	0.07	0.07	0.07	0.07	0.07	0.07	0.07	0.07	0.77	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20	NA	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.07	NA	NA	NA	NA

		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	2013-03-30	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		-6.71	-0.47	-23.29	-1.04	-9.51	-12.05	-8.76	-12.50	-2.79	-7.01	-10.79	-627.64	-5.40	-2.82	-6.33	-24.51	-4.07	-7.01	-2.47	-16.55	155.28	-4.36	-4.23	-3.48	-6.14	-4.59	-3.84	-5.66	-3.65	-7.82	-3.67	-3.10	-2.53	-4.22	-2.83	-2.84	-1.74	-1.32	-1.00	-1.61	-2.12	-2.63	-2.37	NA	-6.57	-8.29	-5.82	-4.05	-12.10	-6.83	-6.68	1.00	14.22	2.94	-10.67	-12.36
Payments To Acquire Property Plant And Equipment		9.52	9.52	8.27	10.66	9.82	13.00	9.69	15.80	10.49	10.49	12.65	12.03	9.32	11.21	14.26	10.92	8.91	10.10	8.76	11.52	7.43	4.36	4.23	3.48	6.14	4.59	3.84	5.66	3.65	1.82	2.03	3.10	2.53	4.22	2.83	2.84	1.74	1.32	1.00	1.61	2.12	2.63	2.37	NA	6.57	8.29	5.82	4.05	5.10	6.83	6.68	11.38	13.95	9.42	10.48	12.17

		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	2013-03-30	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		-54.63	-24.71	-19.72	-57.87	-26.75	-35.91	-21.83	-15.41	-17.74	-17.63	-17.10	125.27	205.59	-13.00	-38.66	-13.33	-12.69	-14.27	-15.53	-9.62	-5.81	-2.89	-2.89	-2.85	-2.85	-2.85	-2.85	0.00	-0.95	0.00	-0.41	0.00	-116.47	-1.56	-1.56	-0.78	-0.78	-0.78	-0.78	-0.78	-0.78	-0.78	-25.78	NA	-16.34	-9.37	-4.37	-36.87	-19.44	-21.98	-34.12	-61.19	-55.61	-60.42	-17.33	-23.44
Payments Of Dividends Common Stock		14.67	14.71	14.76	14.64	14.71	14.87	15.02	14.76	14.74	14.77	14.78	14.65	14.64	13.34	13.33	13.33	11.10	11.10	11.09	11.04	11.02	2.89	2.89	2.85	2.85	2.85	2.85	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	11.72	11.87	11.87	11.87	11.94	11.98	12.01	13.17	13.32	10.33	10.43	10.47
Payments For Repurchase Of Common Stock		0.00	NA	NA	3.20	11.94	21.01	3.96	0.00	3.00	NA	NA	0.00	0.00	0.00	0.25	NA	NA	0.00	0.00	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	NA	0.00	0.00	0.00	25.00	NA	NA	NA	NA	NA	20.00	0.00	55.43	127.24	42.29	51.23	7.00	15.00