Accumulated Other Comprehensive (Loss) Income, Accumulated Other Comprehensive (Loss) Income Balances (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Before-Tax Amount [Abstract]
Foreign currency translation adjustments, net		$ 4.5	$ 29.7
Unrecognized (losses) gains on cash flow hedges, net		1.3	15.1
Pension and other postretirement benefit prior service cost and gain or loss, net		0.1	(1.2)
Other comprehensive income		5.9	43.6
Tax (Expense) or Benefit [Abstract]
Foreign currency translation adjustments, net		(4.6)	4.7
Unrecognized (losses) gains on cash flow hedges, net		0.6	(3.7)
Pension and other postretirement benefit prior service cost and gain or loss, net		0.1	1.6
Other comprehensive income		(3.9)	2.6
Net of Tax Amount [Abstract]
Foreign currency translation adjustments, net		(0.1)	34.4
Unrecognized (losses) gains on cash flow hedges, net		1.9	11.4
Pension and other postretirement benefit prior service cost and gain or loss, net		0.2	0.4
Total other comprehensive income, net of tax	[1]	$ 2.0	$ 46.2

[1] All amounts are net of tax. Amounts in parentheses indicate debits.