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Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | $ 5,652.3 | $ 5,106.6
Unamortized Debt Issuance Costs |  | (38.6) | (36.6)
Unamortized Discount |  | 2.2 | 2.5
Carrying Amount |  | 5,611.5 | 5,067.5
Revolving Secured Line of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [1] | 169.5 | 79.2
Unamortized Debt Issuance Costs | [1] | 0.0 | 0.0
Unamortized Discount | [1] | 0.0 | 0.0
Carrying Amount | [1] | 169.5 | 79.2
Secured Financings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding | [2] | 4,474.5 | 4,019.0
Unamortized Debt Issuance Costs | [2] | (28.2) | (25.6)
Unamortized Discount | [2] | 2.2 | 2.5
Carrying Amount | [2] | 4,444.1 | 3,990.9
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 1,000.0 | 1,000.0
Unamortized Debt Issuance Costs |  | (10.4) | (11.0)
Unamortized Discount |  | 0.0 | 0.0
Carrying Amount |  | 989.6 | 989.0
Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal Outstanding |  | 8.3 | 8.4
Unamortized Debt Issuance Costs |  | 0.0 | 0.0
Unamortized Discount |  | 0.0 | 0.0
Carrying Amount |  | 8.3 | 8.4
Other Assets [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Costs |  | $ (3.8) | $ (4.2)
[1] | Excludes deferred debt issuance costs of $3.8 million and $4.2 million as of March 31, 2024 and December 31, 2023, respectively, which are included in other assets.
[2] | Warehouse facilities and Term ABS financings.

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