Factoring of Accounts Receivable - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Total Factored [Member]
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold without recourse	$ 135.1	$ 161.6	$ 400.4	$ 431.8
Factoring Fees [Member]
Factoring of Accounts Receivable [Line Items]
Accounts receivable sold without recourse	$ 1.3	$ 0.8	$ 2.9	$ 1.7