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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,077.3	$ 1,181.4	$ 1,236.1	$ 984.7	$ 990.5	$ 1,002.4	$ 983.9	$ 774.0	$ 4,479.5	$ 3,750.8	$ 3,425.2
Gross margin	278.8	314.3	332.2	249.4	251.1	284.6	286.5	226.1	1,174.7	1,048.3
Operating Income (Loss)	114.6	140.0	159.7	94.7	93.4	134.8	146.3	89.5	509.0	464.0	404.2
Income from continuing operations	89.1	96.9	114.7	57.9	108.9	79.1	94.7	57.9	358.6	340.6	231.1
Income from discontinued operations	(1.0)	2.8	(1.0)	251.7	6.2	7.2	7.6	3.9	252.5	24.9	$ 19.0
Net income	$ 88.1	$ 99.7	$ 113.7	$ 309.6	$ 115.1	$ 86.3	$ 102.3	$ 61.8	$ 611.1	$ 365.5
Basic earnings per share:
Income from continuing operations (in dollars per share)	$ 1.50	$ 1.61	$ 1.88	$ 0.93	$ 1.75	$ 1.27	$ 1.47	$ 0.89	$ 5.92	$ 5.36	$ 3.57
Income (loss) from discontinued operations (in dollars per share)	(0.02)	0.05	(0.02)	4.05	0.09	0.11	0.12	0.06	4.17	0.39	0.29
Basic earnings per share (in dollars per share)	1.48	1.66	1.86	4.98	1.84	1.38	1.59	0.95	10.09	5.75	3.86
Diluted earnings per share:
Income from continuing operations (in dollars per share)	1.49	1.59	1.87	0.92	1.73	1.26	1.46	0.88	5.88	5.32	3.53
Income (loss) from discontinued operations (in dollars per share)	(0.02)	0.05	(0.02)	4.02	0.09	0.11	0.12	0.06	4.14	0.39	0.29
Diluted earnings per share (in dollars per share)	$ 1.47	$ 1.64	$ 1.85	$ 4.94	$ 1.82	$ 1.37	$ 1.58	$ 0.94	$ 10.02	$ 5.71	$ 3.82

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration