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Fair Value of Financial Instruments (Schedule of Comparison of the Carrying Value and Estimated Fair Value of Financial Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Assets    
Cash and cash equivalents [1] $ 528.8 $ 343.7
Restricted cash and cash equivalents [1] 591.8 501.3
Debt Securities, Available-for-sale, Restricted 109.0 106.4
Loans receivable, net [1] 9,058.0 8,922.7
Liabilities    
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
Carrying Amount [Member]    
Assets    
Cash and cash equivalents 528.8 343.7
Restricted cash and cash equivalents 591.8 501.3
Debt Securities, Available-for-sale, Restricted 109.0 106.4
Loans receivable, net 7,978.2 7,850.3
Liabilities    
Revolving secured lines of credit 1.4 0.1
Secured financing 5,618.0 5,361.5
Senior notes 1,085.8 991.3
Estimated Fair Value [Member]    
Assets    
Cash and cash equivalents 528.8 343.7
Restricted cash and cash equivalents 591.8 501.3
Debt Securities, Available-for-sale, Restricted 109.0 106.4
Loans receivable, net 9,058.0 8,922.7
Liabilities    
Revolving secured lines of credit 1.4 0.1
Secured financing 5,700.2 5,431.9
Senior notes $ 1,127.4 $ 1,035.3
[1] Measured at amortized cost with fair value disclosed.