Accumulated Other Comprehensive Income (Loss) - Balances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Before-Tax Amount
Foreign currency translation adjustments, net	$ (107.2)	$ (89.5)
Unrecognized gains on cash flow hedges, net	0.0	1.6
Pension and other postretirement benefit prior service cost and gain or loss, net	1.5	3.5
Other comprehensive loss	(105.7)	(84.4)
Tax Benefit or (Expense)
Foreign currency translation adjustments, net	7.4	(2.7)
Unrecognized gains on cash flow hedges, net	0.0	(0.4)
Pension and other postretirement benefit prior service cost and gain or loss, net	(0.3)	(0.6)
Other comprehensive loss	7.1	(3.7)
Net of Tax Amount
Foreign currency translation adjustments, net	(99.8)	(92.2)
Unrecognized gains on cash flow hedges, net	0.0	1.2
Pension and other postretirement benefit prior service cost and gain or loss, net	1.2	2.9
Total other comprehensive loss, net of tax	(98.6)	(88.1)
Other comprehensive income, net of tax [Abstract]
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	$ (1.1)	$ (4.0)