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Debt Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Principal Outstanding |  | $ 2,622.1 | $ 2,086.3 |
Unamortized Debt Issuance Costs |  | 16.8 | 16.8 |
Unamortized Discount |  | (1.6) | (1.7) |
Debt Instrument, Carrying Amount |  | 2,603.7 | 2,067.8 |
Other Assets [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Debt Issuance Costs | [1] | 2.4 | 2.2 | [2]
Revolving Secured Line Of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Outstanding | [3] | 0.0 | 57.7 |
Unamortized Debt Issuance Costs | [3] | 0.0 | 0.0 |
Unamortized Discount | [3] | 0.0 | 0.0 |
Debt Instrument, Carrying Amount | [3] | 0.0 | 57.7 |
Secured financings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Outstanding | [1] | 2,072.1 | 1,478.6 | [2]
Unamortized Debt Issuance Costs | [1] | 9.7 | 8.5 | [2]
Unamortized Discount | [1] | 0.0 | 0.0 | [2]
Debt Instrument, Carrying Amount | [1] | 2,062.4 | 1,470.1 | [2]
Senior Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal Outstanding |  | 550.0 | 550.0 | [2]
Unamortized Debt Issuance Costs |  | 7.1 | 8.3 | [2]
Unamortized Discount |  | (1.6) | (1.7) | [2]
Debt Instrument, Carrying Amount |  | $ 541.3 | $ 540.0 | [2]
[1] | Warehouse facilities and Term ABS financings.
[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] | Excludes deferred debt issuance costs of $2.4 million and $2.2 million as of December 31, 2016 and December 31, 2015, respectively, which are included in other assets.

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