Factoring of Accounts Receivable Factoring of Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Total Factored
Factoring of Accounts Receivable [Line Items]
Accounts Receivable Sold without Recourse	$ 873.9	$ 611.2
Factoring Fees
Factoring of Accounts Receivable [Line Items]
Accounts Receivable Sold without Recourse	$ 7.0	$ 4.6