Accumulated Other Comprehensive Loss, Net of Tax Changes in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative instruments, before reclassifications	$ 11.3	$ 0.0	$ 0.0
Total other comprehensive income, before reclassifications	22.3	(2.7)
Total reclassification from AOCI	27.5	13.8	22.1
Accumulated other comprehensive loss, net of tax	(880.2)	(930.0)	(941.1)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Foreign currency translation adjustment, before reclassifications	40.1	12.0
Foreign currency translation adjustment, amount reclassified from AOCI, net of tax	20.0	6.7
Foreign currency translation adjustment, net of tax	(637.6)	(697.7)	(716.4)
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Derivative instruments, before reclassifications	8.5	0.0
Derivative instruments, amount reclassified from AOCI, net of tax	1.8	1.8
Derivative Instruments, net of tax	6.8	(3.5)	(5.3)
Defined Benefit and Postretirement Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Defined Benefit and Postretirement Plans, before reclassifications	(26.3)	(14.7)
Defined benefit and Postretirement Plans, amount reclassified from AOCI, net of tax	5.7	5.3
Pension and Other Postretirement Benefit Plans, net of tax	$ (249.4)	$ (228.8)	$ (219.4)