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Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Principal Outstanding $ 6,404.2 $ 6,391.9
Unamortized Debt Issuance Costs (34.8) (37.7)
Unamortized Discount 0.4 1.3
Carrying Amount 6,369.0 6,352.9
Revolving Secured Line of Credit [Member]    
Debt Instrument [Line Items]    
Principal Outstanding [1] 148.7 0.1
Unamortized Debt Issuance Costs [1] 0.0 0.0
Unamortized Discount [1] 0.0 0.0
Carrying Amount [1] 148.7 0.1
Secured Financings [Member]    
Debt Instrument [Line Items]    
Principal Outstanding [2] 5,155.5 5,391.8
Unamortized Debt Issuance Costs [2] (22.0) (29.0)
Unamortized Discount [2] 0.4 1.3
Carrying Amount [2] 5,133.1 5,361.5
Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal Outstanding 1,100.0 1,000.0
Unamortized Debt Issuance Costs (12.8) (8.7)
Unamortized Discount 0.0 0.0
Carrying Amount 1,087.2 991.3
Other Assets [Member]    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs $ (4.9) $ (4.4)
[1] Excludes deferred debt issuance costs of $4.9 million and $4.4 million as of September 30, 2025 and December 31, 2024, respectively, which are included in other assets.
[2] Warehouse facilities and Term ABS financings.