Unaudited Quarterly Results (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,053.8	$ 1,073.8	$ 974.9	$ 907.0	$ 900.4	$ 904.4	$ 831.9	$ 865.4	$ 4,009.5	$ 3,502.1	$ 3,415.6
Gross profit	313.7	308.7	276.3	243.7	240.8	236.3	227.5	242.6	1,142.4	947.2	971.5
Income from continuing operations	65.4	66.3	57.3	42.8	48.3	46.7	43.5	39.1	231.8	177.6	149.7
Income from discontinued operations, net of income taxes	19.6	145.7	6.9	5.9	7.1	5.6	5.3	4.7	178.1	22.7	25.0
Net income	$ 85.0	$ 212.0	$ 64.2	$ 48.7	$ 55.4	$ 52.3	$ 48.8	$ 43.8	$ 409.9	$ 200.3	$ 174.7
Continuing operations (in dollars per share)	$ 1.26	$ 1.26	$ 1.08	$ 0.81	$ 0.91	$ 0.89	$ 0.83	$ 0.74	$ 4.40	$ 3.37	$ 2.84
Discontinued operations (in dollars per share)	0.38	2.76	0.13	0.11	0.14	0.11	0.10	0.09	3.38	0.43	0.47
Earnings per share (in dollars per share)	1.64	4.02	1.21	0.92	1.05	1.00	0.93	0.83	7.78	3.80	3.31
Continuing operations (in dollars per share)	1.24	1.24	1.06	0.80	0.90	0.88	0.82	0.73	4.33	3.33	2.80
Discontinued operations (in dollars per share)	0.38	2.73	0.13	0.11	0.14	0.11	0.10	0.09	3.33	0.43	0.48
Earnings per share (in dollars per share)	$ 1.62	$ 3.97	$ 1.19	$ 0.91	$ 1.04	$ 0.99	$ 0.92	$ 0.82	$ 7.66	$ 3.76	$ 3.28
Basic (in shares)	52.0	52.7	53.2	53.0	52.8	52.5	52.5	52.8	52.7	52.7	52.8
Weighted Average Number of Shares Outstanding, Diluted	52.9	53.4	53.9	53.7	53.5	53.0	53.0	53.3	53.5	53.3	53.4