Other Comprehensive Loss - Components of OCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Pre-Tax Amount
Other comprehensive (loss) income, pre-tax amount	$ (14.3)	$ (8.8)	$ (15.1)	$ (27.7)
Tax Benefit/ (Expense)
Other comprehensive (loss) income, tax	(0.5)	(0.1)	(0.4)	0.1
After-Tax Amount
Total other comprehensive loss	(14.8)	(8.9)	(15.5)	(27.6)
Defined benefit pension and other postretirement plans
Pre-Tax Amount
Other comprehensive (loss) income, pre-tax amount		0.3		(0.5)
Tax Benefit/ (Expense)
Other comprehensive (loss) income, tax		(0.1)		0.1
After-Tax Amount
Total other comprehensive loss		0.2	0.0	(0.4)
Currency translation adjustments
Pre-Tax Amount
Other comprehensive (loss) income, pre-tax amount	(14.4)	(9.1)	(15.1)	(27.3)
Tax Benefit/ (Expense)
Other comprehensive (loss) income, tax	(0.5)	0.0	(0.4)	0.0
After-Tax Amount
Total other comprehensive loss	(14.9)	$ (9.1)	$ (15.5)	(27.3)
Gain from hedging activities
Pre-Tax Amount
Other comprehensive (loss) income, pre-tax amount	0.1			0.1
Tax Benefit/ (Expense)
Other comprehensive (loss) income, tax	0.0			0.0
After-Tax Amount
Total other comprehensive loss	$ 0.1			$ 0.1