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Debt (Schedule of Principal Debt Outstanding) (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Principal Outstanding $ 6,290.6 $ 5,106.6
Unamortized Debt Issuance Costs (40.1) (36.6)
Unamortized Discount 1.6 2.5
Carrying Amount 6,248.9 5,067.5
Revolving Secured Line of Credit [Member]    
Debt Instrument [Line Items]    
Principal Outstanding [1] 1.0 79.2
Unamortized Debt Issuance Costs [1] 0.0 0.0
Unamortized Discount [1] 0.0 0.0
Carrying Amount [1] 1.0 79.2
Secured Financings [Member]    
Debt Instrument [Line Items]    
Principal Outstanding [2] 5,289.6 4,019.0
Unamortized Debt Issuance Costs [2] (30.9) (25.6)
Unamortized Discount [2] 1.6 2.5
Carrying Amount [2] 5,257.1 3,990.9
Senior Notes [Member]    
Debt Instrument [Line Items]    
Principal Outstanding 1,000.0 1,000.0
Unamortized Debt Issuance Costs (9.2) (11.0)
Unamortized Discount 0.0 0.0
Carrying Amount 990.8 989.0
Mortgages [Member]    
Debt Instrument [Line Items]    
Principal Outstanding 0.0 8.4
Unamortized Debt Issuance Costs 0.0 0.0
Unamortized Discount 0.0 0.0
Carrying Amount 0.0 8.4
Other Assets [Member]    
Debt Instrument [Line Items]    
Unamortized Debt Issuance Costs $ (4.8) $ (4.2)
[1] Excludes deferred debt issuance costs of $4.8 million and $4.2 million as of September 30, 2024 and December 31, 2023, respectively, which are included in other assets.
[2] Warehouse facilities and Term ABS financings.