v3.26.1
Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Principal Outstanding $ 6,438.0 $ 6,387.9
Unamortized Debt Issuance Costs (29.4) (33.9)
Unamortized Discount 0.0 0.1
Carrying Amount 6,408.6 6,353.9
Revolving Secured Line of Credit [Member]    
Debt Instrument [Line Items]    
Principal Outstanding [1] 219.6 107.3
Unamortized Debt Issuance Costs [1] 0.0 0.0
Unamortized Discount [1] 0.0 0.0
Carrying Amount [1] 219.6 107.3
Secured Financings [Member]    
Debt Instrument [Line Items]    
Principal Outstanding [2] 5,118.4 5,180.6
Unamortized Debt Issuance Costs [2] (18.1) (21.7)
Unamortized Discount [2] 0.0 0.1
Carrying Amount [2] 5,100.3 5,158.8
Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal Outstanding 1,100.0 1,100.0
Unamortized Debt Issuance Costs (11.3) (12.2)
Unamortized Discount 0.0 0.0
Carrying Amount 1,088.7 1,087.8
Deferred Debt Issuance Cost    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs $ (4.0) $ (4.5)
[1] Excludes deferred debt issuance costs of $4.0 million and $4.5 million as of March 31, 2026 and December 31, 2025, respectively, which are included in other assets.
[2] Warehouse facilities and Term ABS financings.