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Debt (Schedule of Principal Debt Outstanding) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | $ 4,816.3 | $ 4,642.7
Unamortized Debt Issuance Costs |  | (24.1) | (26.4)
Carrying Amount |  | 4,792.2 | 4,616.3
Revolving Secured Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [1] | 220.7 | 2.6
Unamortized Debt Issuance Costs | [1] | 0.0 | 0.0
Carrying Amount | [1] | 220.7 | 2.6
Secured Financings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [2] | 3,786.4 | 3,830.4
Unamortized Debt Issuance Costs | [2] | (17.5) | (18.9)
Carrying Amount | [2] | 3,768.9 | 3,811.5
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 800.0 | 800.0
Unamortized Debt Issuance Costs |  | (6.6) | (7.5)
Carrying Amount |  | 793.4 | 792.5
Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 9.2 | 9.7
Unamortized Debt Issuance Costs |  | 0.0 | 0.0
Carrying Amount |  | 9.2 | 9.7
Other Assets [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | $ (4.7) | $ (3.6)
[1] | Excludes deferred debt issuance cost s of $4.7 million and $3.6 million as of June 30, 2022 and December 31, 2021, respectively, which are included in other assets.
[2] | Warehouse facilities and Term ABS.

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