General Information - Accounts Receivable and Allowances (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Receivables Sold and Derecognized	$ 811.2	$ 844.8
Proceeds Collected on Behalf of Financial Institutions	504.1	833.7
Net Proceeds Paid to Financial Institutions	(28.8)	(128.7)
Deferred Purchase Price	4.3	240.4
Pledged Receivables	144.2	0.0
Receivables sold	32.0	$ 30.0
Amount transferred subject to continuing involvement	$ 470.0		$ 602.0