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Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Debt facility financing amount |  | $ 2,557.4 |  | $ 2,086.3 |
Deferred Debt Issuance Costs |  | (17.5) |  | (16.8) |
Unamortized debt discount |  | (1.6) |  | (1.7) |
Carrying Amount |  | 2,538.3 |  | 2,067.8 |
Revolving Secured Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt facility financing amount | [1] | 0.0 |  | 57.7 |
Deferred Debt Issuance Costs | [1] | 0.0 |  | 0.0 |
Unamortized debt discount | [1] | 0.0 |  | 0.0 |
Carrying Amount | [1] | 0.0 |  | 57.7 |
Secured financings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt facility financing amount |  | 2,007.4 | [1] | 1,478.6 | [2],[3]
Deferred Debt Issuance Costs |  | (9.7) | [1] | (8.5) | [2],[3]
Unamortized debt discount |  | 0.0 | [1] | 0.0 | [2],[3]
Carrying Amount |  | 1,997.7 | [1] | 1,470.1 | [2],[3]
Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt facility financing amount |  | 550.0 |  | 550.0 | [2]
Deferred Debt Issuance Costs |  | (7.8) |  | (8.3) | [2]
Unamortized debt discount |  | (1.6) |  | (1.7) | [2]
Carrying Amount |  | $ 540.6 |  | $ 540.0 | [2]
[1] | Excludes deferred debt issuance costs of $2.9 million and $2.2 million as of June 30, 2016 and December 31, 2015, respectively, which are included in other assets.
[2] | Prior year amounts have been reclassified to reflect the adoption of ASU 2015-03, as amended by ASU No. 2015-15, which resulted in a reclassification of certain deferred debt issuance costs from other assets to secured financing and senior notes.
[3] | Warehouse facilities and asset-backed secured financings ("Term ABS").

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