Accumulated Other Comprehensive Income (Loss) - Balances (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Before-Tax Amount
Foreign currency translation adjustments, net	$ 51.0	$ 41.9	$ (56.2)	$ (47.7)
Unrecognized gains on cash flow hedges, net	0.0	7.3	0.0	8.8
Pension and other postretirement benefit prior service cost and gain or loss, net	1.5	0.4	3.0	3.9
Other comprehensive income (loss)	52.5	49.6	(53.2)	(35.0)
Tax Benefit or (Expense)
Foreign currency translation adjustments, net	(1.9)	3.0	5.5	0.4
Unrecognized gains on cash flow hedges, net	0.0	(1.8)	0.0	(2.1)
Pension and other postretirement benefit prior service cost and gain or loss, net	(0.2)	0.1	(0.5)	(0.5)
Other comprehensive income (loss)	(2.1)	1.3	5.0	(2.2)
Net of Tax Amount
Foreign currency translation adjustments, net	49.1	44.9	(50.7)	(47.3)
Unrecognized gains on cash flow hedges, net	0.0	5.5	0.0	6.7
Pension and other postretirement benefit prior service cost and gain or loss, net	1.3	0.5	2.5	3.4
Total other comprehensive income (loss), net of tax	50.4	50.9	(48.2)	(37.2)
Other comprehensive income, net of tax [Abstract]
Other comprehensive income (loss), net of tax, attributable to noncontrolling interest	$ (1.2)	$ (0.4)	$ (2.3)	$ (4.4)