General Information (Details) - USD ($)			1 Months Ended	3 Months Ended
	Mar. 13, 2017	Jan. 01, 2017	Feb. 10, 2017	Mar. 31, 2017	Mar. 31, 2016	Jan. 10, 2017	Dec. 31, 2016	Feb. 04, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Pre-2017 Excess Tax Benefit related to Share-Based Payments		$ 39,100,000		$ 2,000,000
Receivables sold and derecognized				346,000,000	$ 300,000,000
Amount collected on behalf of financial institution				353,000,000	290,000,000
Amount funded by financial institution				0	24,000,000
Amount of deferred proceeds				33,000,000	36,000,000
Receivables sold				18,000,000	$ 10,000,000
Amount transferred subject to continuing involvement				$ 370,000,000			$ 376,000,000
Dividends declared (in dollars per share)	$ 0.075			$ 0.075	$ 0.05
Share repurchase program, authorized amount						$ 250,000,000		$ 250,000,000
Shares repurchased (in shares)			1,440,697	2,956,121	3,712,552
Shares repurchased, average price (in dollars per share)				$ 12.98	$ 12.12
Stock repurchase program, remaining authorized repurchase amount				$ 230,000,000
Business Combinations [Abstract]
Charges Associated with Business Combinations				3,900,000	$ 5,100,000
Other Special Charges				4,700,000	5,400,000
Business Combinations and Other Special Charges				$ 8,600,000	$ 10,500,000