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Debt (Schedule of Outstanding Debt Amount) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Mar. 30, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 0.0 |  | $ 119.5
Balance outstanding |  | 1,532.9 |  | 1,333.0
Balance outstanding |  | 548.3 |  | 300.0
Restricted cash and cash equivalents pledged as collateral |  | 176.0 |  | 157.6
Revolving Secured Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | 0.0 |  | 119.5
Amount available for borrowing | [1] | $ 310.0 |  | $ 115.5
Interest rate |  | 2.06% |  | 2.16%
Warehouse Facility II [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 0.0 |  | $ 81.3
Amount available for borrowing | [1] | 400.0 |  | 243.7
Loans pledged as collateral |  | 0.0 |  | 104.1
Restricted cash and cash equivalents pledged as collateral |  | $ 1.7 |  | $ 2.0
Senior notes yield to maturity |  | 2.20% |  | 2.16%
Warehouse Facility IV [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 12.0 |  | $ 19.9
Amount available for borrowing | [1] | 63.0 |  | 55.1
Loans pledged as collateral |  | 22.8 |  | 44.9
Restricted cash and cash equivalents pledged as collateral |  | $ 0.9 |  | $ 1.4
Senior notes yield to maturity |  | 2.19% |  | 2.17%
Warehouse Facility V [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 0.0 |  | $ 17.9
Amount available for borrowing | [1] | 100.0 |  | 57.1
Loans pledged as collateral |  | 0.0 |  | 34.9
Restricted cash and cash equivalents pledged as collateral |  | $ 1.1 |  | $ 1.2
Senior notes yield to maturity |  | 1.80% |  | 1.77%
Warehouse Facility VI [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 0.0 |  |
Amount available for borrowing | [1] | 75.0 |  | $ 0.0
Loans pledged as collateral |  | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.1 |  | $ 0.0
Senior notes yield to maturity |  | 2.20% |  | 0.00%
Term ABS 2012-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 0.0 |  | $ 43.8
Loans pledged as collateral |  | 0.0 |  | 145.1
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 |  | $ 19.3
Senior notes yield to maturity |  | 0.00% |  | 3.04%
Term ABS 2012-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 0.0 |  | $ 184.0
Loans pledged as collateral |  | 0.0 |  | 278.6
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 |  | $ 27.8
Senior notes yield to maturity |  | 0.00% |  | 1.67%
Term ABS 2013-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 74.3 |  | $ 140.3
Loans pledged as collateral |  | 159.1 |  | 186.7
Restricted cash and cash equivalents pledged as collateral |  | $ 16.5 |  | $ 16.7
Senior notes yield to maturity |  | 1.40% |  | 1.31%
Term ABS 2013-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 197.8 |  | $ 197.8
Loans pledged as collateral |  | 246.2 |  | 248.9
Restricted cash and cash equivalents pledged as collateral |  | $ 23.4 |  | $ 21.2
Senior notes yield to maturity |  | 1.67% |  | 1.67%
Term ABS 2014-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 299.0 |  | $ 299.0
Loans pledged as collateral |  | 364.5 |  | 426.2
Restricted cash and cash equivalents pledged as collateral |  | $ 33.6 |  | $ 31.6
Senior notes yield to maturity |  | 1.72% |  | 1.72%
Term ABS 2014-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 349.0 |  | $ 349.0
Loans pledged as collateral |  | 433.2 |  | 440.7
Restricted cash and cash equivalents pledged as collateral |  | $ 38.9 |  | $ 36.2
Senior notes yield to maturity |  | 2.05% |  | 2.05%
Term ABS 2015-1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 300.6 |  |
Loans pledged as collateral |  | 372.7 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 30.3 |  |
Senior notes yield to maturity |  | 2.26% |  |
Term ABS 2015-2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 300.2 |  |
Loans pledged as collateral |  | 401.4 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 28.9 |  |
Senior notes yield to maturity |  | 2.63% |  |
2021 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding |  | $ 300.0 |  | $ 300.0
Senior notes yield to maturity |  | 6.125% |  | 6.125%
2023 Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance outstanding | [2] | $ 248.3 |  | $ 0.0
Senior notes yield to maturity |  | 7.375% | 7.50% | 0.00%
[1] | Availability may be limited by the amount of assets pledged as collateral.
[2] | As of September 30, 2015 the outstanding balance presented for the 2023 Senior Notes includes an unamortized debt discount of $1.7 million.

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