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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
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] $ 1.4 $ 22.8
Restricted cash and cash equivalents [1] 490.7 477.9
Debt Securities, Available-for-sale [2] 116.6 106.2
Loans receivable, net [1] 9,010.3 8,974.1
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
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] 1.4 22.8
Restricted cash and cash equivalents [1] 490.7 477.9
Debt Securities, Available-for-sale [2] 99.7 84.7
Loans receivable, net [1] 0.0 0.0
Secured financing [1] 3,521.2 3,825.1
Senior notes [1] 1,128.6 1,131.4
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-sale [2] 16.9 21.5
Loans receivable, net [1] 0.0 0.0
Revolving secured lines of credit [1] 177.8 107.3
Secured financing [1] 1,525.2 1,400.2
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable, net [1] $ 9,010.3 $ 8,974.1
[1] Measured at amortized cost with fair value disclosed.
[2] Measured at fair value on a recurring basis.