Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 193.6	$ 135.1	$ 622.2	$ 400.4
Discounts and Fees
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold	$ 1.6	$ 1.3	$ 5.4	$ 2.9