Debt - Credit Facility (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Corporate Credit Agreement	$ 0.0
Line of Credit Facility, Remaining Borrowing Capacity	150.0
Receivables facility amount outstanding	0.0	$ 89.5
Letters of Credit Outstanding, Amount	6.3
Receivables facility remaining borrowing capacity	100.1
Receivables facility maximum borrowing availability	$ 106.4
Accounts Receivable Facility, Renewal Term	364
Receivables facility maximum borrowing capacity	$ 120.0