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Fair Value of Financial Instruments (Schedule of Assets and Liabilities, Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] $ 528.8 $ 343.7
Restricted cash and cash equivalents [1] 591.8 501.3
Debt Securities, Available-for-sale [2] 109.0 106.4
Loans receivable, net [1] 9,058.0 8,922.7
Revolving secured lines of credit [1] 1.4 0.1
Secured financing [1] 5,700.2 5,431.9
Senior notes [1] 1,127.4 1,035.3
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] 528.8 343.7
Restricted cash and cash equivalents [1] 591.8 501.3
Debt Securities, Available-for-sale [2] 88.0 84.5
Loans receivable, net [1] 0.0 0.0
Secured financing [1] 4,100.1 3,831.7
Senior notes [1] 1,127.4 1,035.3
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-sale [2] 21.0 21.9
Loans receivable, net [1] 0.0 0.0
Revolving secured lines of credit [1] 1.4 0.1
Secured financing [1] 1,600.1 1,600.2
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable, net [1] $ 9,058.0 $ 8,922.7
[1] Measured at amortized cost with fair value disclosed.
[2] Measured at fair value on a recurring basis.