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Debt (Schedule of Outstanding Debt Amount) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Balance outstanding $ 106.2 $ 102.8
Balance outstanding 1,248.5 935.6
Balance outstanding 300.0 350.2
Restricted cash and cash equivalents pledged as collateral 156.6 111.3
Revolving Secured Line of Credit [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 106.2 102.8
Amount available for borrowing 128.8 [1] 132.2 [1]
Interest rate 2.03% 2.04%
Warehouse Facility II [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 154.5 0
Amount available for borrowing 170.5 [1] 325.0 [1]
Loans pledged as collateral 209.8 0
Restricted cash and cash equivalents pledged as collateral 3.6 1.2
Interest rate 2.15% 2.17%
Warehouse Facility III [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 0   
Amount available for borrowing 75.0 [1] 75.0 [1]
Loans pledged as collateral 0   
Restricted cash and cash equivalents pledged as collateral 0.2 0.3
Interest rate 1.76% 1.77%
Warehouse Facility IV [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 25.0 0
Amount available for borrowing 50.0 [1] 75.0 [1]
Loans pledged as collateral 45.2 0
Restricted cash and cash equivalents pledged as collateral 1.4 0.2
Interest rate 2.15% 2.17%
Term ABS 2011-1 [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 40.2 144.2
Loans pledged as collateral 162.0 215.3
Restricted cash and cash equivalents pledged as collateral 22.2 23.2
Interest rate 3.96% 3.01%
Term ABS 2012-1 [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 139.7 201.3
Loans pledged as collateral 201.8 240.4
Restricted cash and cash equivalents pledged as collateral 25.0 23.5
Interest rate 2.46% 2.38%
Term ABS 2012-2 [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 252.0 252.0
Loans pledged as collateral 300.8 303.8
Restricted cash and cash equivalents pledged as collateral 31.8 27.7
Interest rate 1.63% 1.63%
Term ABS 2013-1 [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 140.3 140.3
Loans pledged as collateral 183.4 184.3
Restricted cash and cash equivalents pledged as collateral 17.6 15.3
Interest rate 1.31% 1.31%
Term ABS 2013-2 [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 197.8 197.8
Loans pledged as collateral 244.3 250.5
Restricted cash and cash equivalents pledged as collateral 21.3 18.7
Interest rate 1.67% 1.67%
Term ABS 2014-1 [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 299.0   
Loans pledged as collateral 445.1   
Restricted cash and cash equivalents pledged as collateral 33.1   
Interest rate 1.72%   
2017 Senior Notes [Member]
    
Debt Instrument [Line Items]    
Balance outstanding 0 [2] 350.2 [2]
Interest rate 0.00% 9.125%
Unamortized debt premium net   0.2
2021 Senior Notes [Member]
    
Debt Instrument [Line Items]    
Balance outstanding $ 300.0 [2] $ 0 [2]
Interest rate 6.125% 0.00%
[1] Availability may be limited by the amount of assets pledged as collateral.
[2] As of December 31, 2013, the outstanding balance presented for the 2017 Senior Notes includes a net unamortized debt premium of $0.2 million.