Sale of Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sale of Receivables [Abstract]
Sale of receivables to financial institutions	$ 224.3	$ 201.7	$ 404.1	$ 367.6
Charge related to sale of receivables	$ 6.4	$ 4.9	$ 11.6	$ 8.9