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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
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] $ 159.7 $ 13.2
Restricted cash and cash equivalents [1] 556.6 457.7
Debt Securities, Available-for-sale [2] 113.9 93.2
Loans receivable, net [1] 8,882.3 7,759.1
Revolving secured lines of credit [1] 1.0 79.2
Secured financing [1] 5,360.4 4,025.9
Senior notes [1] 1,042.8 1,039.8
Mortgage note 0.0 8.4 [1]
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] 159.7 13.2
Restricted cash and cash equivalents [1] 556.6 457.7
Debt Securities, Available-for-sale [2] 90.7 75.1
Loans receivable, net [1] 0.0 0.0
Secured financing [1] 4,460.2 3,225.8
Senior notes [1] 1,042.8 1,039.8
Mortgage note [1]   0.0
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt Securities, Available-for-sale [2] 23.2 18.1
Loans receivable, net [1] 0.0 0.0
Revolving secured lines of credit [1] 1.0 79.2
Secured financing [1] 900.2 800.1
Mortgage note [1]   8.4
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans receivable, net [1] $ 8,882.3 $ 7,759.1
[1] Measured at amortized cost with fair value disclosed.
[2] Measured at fair value on a recurring basis.