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Debt (Schedule of Principal Debt Outstanding) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | $ 4,746.4 | $ 4,635.1
Unamortized Debt Issuance Costs |  | (30.4) | (26.5)
Carrying Amount |  | 4,716.0 | 4,608.6
Revolving Secured Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [1] | 0.0 | 95.9
Unamortized Debt Issuance Costs | [1] | 0.0 | 0.0
Carrying Amount | [1] | 0.0 | 95.9
Secured financings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [2] | 3,936.1 | 3,728.7
Unamortized Debt Issuance Costs | [2] | (21.5) | (17.1)
Carrying Amount | [2] | 3,914.6 | 3,711.6
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 800.0 | 800.0
Unamortized Debt Issuance Costs |  | (8.9) | (9.4)
Carrying Amount |  | 791.1 | 790.6
Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 10.3 | 10.5
Unamortized Debt Issuance Costs |  | 0.0 | 0.0
Carrying Amount |  | 10.3 | 10.5
Other Assets [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | $ (2.9) | $ (3.2)
[1] | Excludes deferred debt issuance cost s of $2.9 million an d $3.2 million as of March 31, 2021 and December 31, 2020, respectively, which are included in other assets.
[2] | Warehouse facilities and Term ABS.

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