Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 203.1	$ 133.1	$ 428.6	$ 265.2
Discounts and Fees
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 2.0	$ 0.8	$ 3.8	$ 1.5