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Debt Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt facility financing amount |  | $ 2,924.2 | $ 2,622.1
Deferred Debt Issuance Costs |  | (17.4) | (16.8)
Unamortized debt discount |  | (1.5) | (1.6)
Carrying Amount |  | 2,905.3 | 2,603.7
Revolving Secured Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt facility financing amount | [1] | 134.1 |
Deferred Debt Issuance Costs | [1] | 0.0 |
Unamortized debt discount | [1] | 0.0 |
Carrying Amount | [1] | 134.1 |
Secured financings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt facility financing amount | [2] | 2,240.1 | 2,072.1
Deferred Debt Issuance Costs | [2] | (10.6) | (9.7)
Unamortized debt discount | [2] | 0.0 | 0.0
Carrying Amount | [2] | 2,229.5 | 2,062.4
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt facility financing amount |  | 550.0 | 550.0
Deferred Debt Issuance Costs |  | (6.8) | (7.1)
Unamortized debt discount |  | (1.5) | (1.6)
Carrying Amount |  | $ 541.7 | $ 541.3
[1] | Excludes deferred debt issuance costs of $2.1 million and $2.4 million as of March 31, 2017 and December 31, 2016, respectively, which are included in other assets.
[2] | Warehouse facilities and asset-backed secured financings ("Term ABS").

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