Debt - Short-Term Borrowings (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Line of Credit Facility [Line Items]
Short-term borrowings	$ 220.0		$ 235.0
Interest expense, net	1.8	$ 1.4
Revolving Credit Facility
Line of Credit Facility [Line Items]
Short-term borrowings	220.0		$ 235.0
Minimum
Line of Credit Facility [Line Items]
Short-term borrowings	120.0	140.0
Maximum
Line of Credit Facility [Line Items]
Short-term borrowings	$ 250.0	$ 234.0