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Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Debt facility financing amount |  | $ 3,469.9 | $ 3,093.0
Deferred Debt Issuance Costs |  | (22.2) | (20.9)
Unamortized debt discount |  | (1.3) | (1.3)
Carrying Amount |  | 3,446.4 | 3,070.8
Other Assets [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Deferred Debt Issuance Costs |  | (2.5) | (2.8)
Revolving Secured Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt facility financing amount | [1] | 23.0 | 13.9
Deferred Debt Issuance Costs | [1] | 0.0 | 0.0
Unamortized debt discount | [1] | 0.0 | 0.0
Carrying Amount | [1] | 23.0 | 13.9
Secured financings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt facility financing amount |  | 2,896.9 | 2,529.1
Deferred Debt Issuance Costs |  | (16.7) | (15.0)
Unamortized debt discount |  | 0.0 | 0.0
Carrying Amount |  | 2,880.2 | 2,514.1
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt facility financing amount |  | 550.0 | 550.0
Deferred Debt Issuance Costs |  | (5.5) | (5.9)
Unamortized debt discount |  | (1.3) | (1.3)
Carrying Amount |  | $ 543.2 | $ 542.8
[1] | Warehouse facilities and Term ABS.

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