Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (153.0)	$ (171.0)	$ 1,957.4		$ 1,957.4
Change in component	(14.3)	14.7	(31.8)
Reclassification adjustments into earnings	2.8	(4.1)	0.8
Income tax effect	0.9	0.8	0.9	$ 22.3		$ 3.4
Ending balance	1,976.9	(153.0)	(171.0)	1,930.0	1,976.9	1,930.0
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(153.0)		(137.5)	(182.5)	(137.5)	(163.6)
Income tax effect	(18.0)			22.3	(33.5)	3.4
Ending balance	(171.0)	(153.0)		$ (160.2)	(171.0)	$ (160.2)
Foreign Currency Translation Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(65.0)	(80.3)	(43.7)		(43.7)
Change in component	(20.7)	15.3	(36.6)
Reclassification adjustments into earnings	0.0	0.0	0.0
Income tax effect	0.0	0.0	0.0
Ending balance	(85.7)	(65.0)	(80.3)		(85.7)
Unrealized Loss on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(13.6)	(14.0)	(14.6)		(14.6)
Change in component	6.4	(0.6)	4.8
Reclassification adjustments into earnings	(6.0)	1.0	(4.1)
Income tax effect	0.1	0.0	0.1
Ending balance	(13.3)	(13.6)	(14.0)		(13.3)
Post-Retirement Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	74.4	76.7	79.2		79.2
Change in component	0.0	0.0	0.0
Reclassification adjustments into earnings	3.2	3.1	3.3
Income tax effect	(0.8)	(0.8)	(0.8)
Ending balance	$ 72.0	$ 74.4	$ 76.7		$ 72.0