Debt - Credit Facility (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Line of Credit Facility [Line Items]
Credit Agreement	$ 15.0	$ 18.0
Line of Credit Facility, Remaining Borrowing Capacity	185.0
Receivables facility maximum borrowing capacity	225.0
Receivables Facility Maximum Borrowing Availability	187.1
Receivables facility amount outstanding	175.8	$ 176.6
Letters of Credit Outstanding, Amount	9.9
Receivables Facility Remaining Borrowing Capacity	$ 1.4
Accounts Receivable Facility, Renewal Term	364
Accounts Receivable Sold	$ 16.3