Accumulated Other Comprehensive Income (Loss) - Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 1,869.9
Before tax income (loss)	255.8	$ 3.0	$ (36.7)
Income tax effect	14.4	(3.8)	(10.8)
Other comprehensive income (loss), net of tax	270.2	(0.8)	(47.5)
Ending balance	9,119.7	1,869.9
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		(8.2)	0.3
Ending balance			(8.2)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(256.0)	(247.0)	(199.8)
Ending balance	14.2	(256.0)	(247.0)
Foreign Currency Translation Adjustments, Net
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(193.6)	(190.6)	(129.6)
Before tax income (loss)	253.1	4.1	(54.3)
Income tax effect	15.1	(5.6)	(6.7)
Other comprehensive income (loss), net of tax	268.2	(1.5)	(61.0)
Ending balance	74.6	(193.6)	(190.6)
Foreign Currency Translation Adjustments, Net | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		(1.5)	0.0
Ending balance			(1.5)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(10.9)	(11.4)	(29.8)
Before tax income (loss)	14.2	8.2	25.3
Income tax effect	(3.3)	(1.0)	(7.2)
Other comprehensive income (loss), net of tax	10.9	7.2	18.1
Ending balance	0.0	(10.9)	(11.4)
Unrealized Gains (Losses) on Cash Flow Hedges | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		(6.7)	0.3
Ending balance			(6.7)
Pension and Postretirement Benefit Plans
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(51.5)	(45.0)	(40.4)
Before tax income (loss)	(11.5)	(9.3)	(7.7)
Income tax effect	2.6	2.8	3.1
Other comprehensive income (loss), net of tax	(8.9)	(6.5)	(4.6)
Ending balance	$ (60.4)	(51.5)	(45.0)
Pension and Postretirement Benefit Plans | Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance		$ 0.0	0.0
Ending balance			$ 0.0