Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance, Foreign Currency Translation Gain (Loss)	$ 68.1	$ 58.0	$ 10.5
Change in Foreign Currency Translation Gain (Loss)	24.4	(10.1)	(47.5)
Foreign currency translation gain loss before reclassification adjustment into earnings	0.0	0.0	0.0
Foreign Currency Translation Gain (Loss), Income tax effect	0.0	0.0	0.0
Ending Balance, Foreign Currency Translation Gain (Loss)	43.7	68.1	58.0
Beginning Balance, Unrealized Loss on Derivative Instruments	10.1	14.0	15.5
Change in Unrealized Loss on Derivative Instruments	(20.4)	17.4	12.9
Unrealized Loss on Derivative Instruments, Reclassification adjustments into earnings	14.9	(11.8)	(7.4)
Unrealized Loss on Derivative Instruments, Income tax effect	1.0	(1.7)	(1.0)
Ending Balance, Unrealized Loss on Derivative Instruments	14.6	10.1	14.0
Beginning Balance, Post-Retirement Benefit Plans	(85.4)	(92.6)	(83.6)
Change in Post-Retirement Benefit Plans	(3.8)	1.5	2.1
Post-Retirement Benefit Plans, Reclassification adjustments into earnings	12.1	7.6	9.9
Post-Retirement Benefit Plans, Income tax effect	(2.1)	(1.9)	(4.6)
Ending Balance, Post-Retirement Benefit Plans	(79.2)	(85.4)	(92.6)
Other Comprehensive Income Change in Component	0.2	8.8	(32.5)
Reclassification adjustments into earnings, Total	27.0	(4.2)	2.5
Income tax effect, Total	(1.1)	(3.6)	(5.6)
Accumulated other comprehensive income (loss), net of tax	$ 137.5	$ 163.6	$ 164.6	$ 109.6
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201802Member
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign currency translation gain loss before reclassification adjustment into earnings			$ 0.0
Unrealized Loss on Derivative Instruments, Reclassification adjustments into earnings			3.0
Post-Retirement Benefit Plans, Reclassification adjustments into earnings			(16.4)
Reclassification adjustments into earnings, Total			$ (19.4)