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Debt (Schedule of Principal Debt Outstanding) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | $ 4,644.3 | $ 4,568.7
Unamortized Debt Issuance Costs |  | (25.0) | (29.1)
Unamortized Discount |  | 0.0 | (0.8)
Carrying Amount |  | 4,619.3 | 4,538.8
Other Assets [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | (2.2) | (3.2)
Revolving Secured Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [1] | 125.7 | 0.0
Unamortized Debt Issuance Costs | [1] | 0.0 | 0.0
Unamortized Discount | [1] | 0.0 | 0.0
Carrying Amount | [1] | 125.7 | 0.0
Secured financings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [2] | 3,707.9 | 3,355.6
Unamortized Debt Issuance Costs | [2] | (15.1) | (15.9)
Unamortized Discount | [2] | 0.0 | 0.0
Carrying Amount | [2] | 3,692.8 | 3,339.7
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 800.0 | 1,201.8
Unamortized Debt Issuance Costs |  | (9.9) | (13.2)
Unamortized Discount |  | 0.0 | (0.8)
Carrying Amount |  | 790.1 | 1,187.8
Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 10.7 | 11.3
Unamortized Debt Issuance Costs |  | 0.0 | 0.0
Unamortized Discount |  | 0.0 | 0.0
Carrying Amount |  | $ 10.7 | $ 11.3
[1] | Excludes deferred debt issuance cost s of $2.2 million a nd $3.2 million as of September 30, 2020 and December 31, 2019, respectively, which are included in other assets.
[2] | Warehouse facilities and Term ABS.

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