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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
Jun. 30, 2026
Dec. 31, 2025
Assets    
Cash and cash equivalents [1] $ 1.4 $ 22.8
Restricted cash and cash equivalents [1] 490.7 477.9
Debt Securities, Available-for-sale, Restricted 116.6 106.2
Loans receivable, net [1] 9,010.3 8,974.1
Liabilities    
Revolving secured lines of credit [1] 177.8 107.3
Secured financing [1] 5,046.4 5,225.3
Senior notes [1] 1,128.6 1,131.4
Carrying Amount [Member]    
Assets    
Cash and cash equivalents 1.4 22.8
Restricted cash and cash equivalents 490.7 477.9
Debt Securities, Available-for-sale, Restricted 116.6 106.2
Loans receivable, net 7,959.2 7,909.2
Liabilities    
Revolving secured lines of credit 177.8 107.3
Secured financing 5,019.0 5,158.8
Senior notes 1,089.4 1,087.8
Estimated Fair Value [Member]    
Assets    
Cash and cash equivalents 1.4 22.8
Restricted cash and cash equivalents 490.7 477.9
Debt Securities, Available-for-sale, Restricted 116.6 106.2
Loans receivable, net 9,010.3 8,974.1
Liabilities    
Revolving secured lines of credit 177.8 107.3
Secured financing 5,046.4 5,225.3
Senior notes $ 1,128.6 $ 1,131.4
[1] Measured at amortized cost with fair value disclosed.