Sale of Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Sale of Receivables [Abstract]
Sale of receivables to financial institutions	$ 720.0	$ 780.5
Charge related to sale of receivables	$ 24.4	$ 22.6	$ 19.3