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Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | $ 4,257.8 | $ 3,842.5
Unamortized Debt Issuance Costs |  | (24.7) | (20.5)
Unamortized Discount |  | (0.9) | (1.1)
Carrying Amount |  | 4,232.2 | 3,820.9
Other Assets [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | (3.5) | (2.9)
Revolving Secured Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [1] | 52.2 | 171.9
Unamortized Debt Issuance Costs | [1] | 0.0 | 0.0
Unamortized Discount | [1] | 0.0 | 0.0
Carrying Amount | [1] | 52.2 | 171.9
Secured financings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [2] | 3,244.1 | 3,108.7
Unamortized Debt Issuance Costs | [2] | (15.8) | (16.0)
Unamortized Discount | [2] | 0.0 | 0.0
Carrying Amount | [2] | 3,228.3 | 3,092.7
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 950.0 | 550.0
Unamortized Debt Issuance Costs |  | (8.9) | (4.5)
Unamortized Discount |  | (0.9) | (1.1)
Carrying Amount |  | 940.2 | 544.4
Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 11.5 | 11.9
Unamortized Debt Issuance Costs |  | 0.0 | 0.0
Unamortized Discount |  | 0.0 | 0.0
Carrying Amount |  | $ 11.5 | $ 11.9
[1] | Excludes deferred debt issuance costs of $3.5 million and $2.9 million as of September 30, 2019 and December 31, 2018, respectively, which are included in other assets.
[2] | Warehouse facilities and Term ABS.

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