Debt (Schedule of Outstanding Term ABS Financings) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Term ABS 2012-2 [Member]
Debt Instrument [Line Items]
Close Date	Sep. 20, 2012
Net Book Value of Loans Contributed at Closing	$ 315.1
Maturity Date	Sep. 15, 2014	[1],[2]
Term ABS 2013-1 [Member]
Debt Instrument [Line Items]
Close Date	Apr. 25, 2013
Net Book Value of Loans Contributed at Closing	187.8
Maturity Date	Apr. 15, 2015	[1],[2]
Term ABS 2013-2 [Member]
Debt Instrument [Line Items]
Close Date	Oct. 31, 2013
Net Book Value of Loans Contributed at Closing	250.1
Maturity Date	Oct. 15, 2015	[1],[2]
Term ABS 2014-1 [Member]
Debt Instrument [Line Items]
Close Date	Apr. 16, 2014
Net Book Value of Loans Contributed at Closing	374.7
Maturity Date	Apr. 15, 2016	[1],[2]
Term ABS 2014-2 [Member]
Debt Instrument [Line Items]
Close Date	Sep. 25, 2014
Net Book Value of Loans Contributed at Closing	437.6
Maturity Date	Sep. 15, 2016	[1],[2]
Term ABS 2015-1 [Member]
Debt Instrument [Line Items]
Close Date	Jan. 29, 2015
Net Book Value of Loans Contributed at Closing	$ 375.9
Maturity Date	Jan. 16, 2017	[1],[2]

[1] Represents the revolving maturity date. The outstanding balance will amortize after the maturity date based on the cash flows of the pledged assets.

[2] Financing made available only to a specified subsidiary of the Company.