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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, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | [1] | $ 8.4 | $ 13.2
Restricted cash and cash equivalents | [1] | 559.2 | 457.7
Debt Securities, Available-for-sale | [2] | 99.9 | 93.2
Loans receivable, net | [1] | 8,215.3 | 7,759.1
Revolving secured lines of credit | [1] | 169.5 | 79.2
Secured financing | [1] | 4,304.6 | 4,025.9
Senior notes | [1] | 1,045.8 | 1,039.8
Mortgage note | [1] | 8.3 | 8.4
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | [1] | 8.4 | 13.2
Restricted cash and cash equivalents | [1] | 559.2 | 457.7
Debt Securities, Available-for-sale | [2] | 79.1 | 75.1
Secured financing | [1] | 3,444.5 | 3,225.8
Senior notes | [1] | 1,045.8 | 1,039.8
Mortgage note | [1] | 0.0 | 0.0
Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt Securities, Available-for-sale | [2] | 20.8 | 18.1
Revolving secured lines of credit | [1] | 169.5 | 79.2
Secured financing | [1] | 860.1 | 800.1
Mortgage note | [1] | 8.3 | 8.4
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans receivable, net | [1] | $ 8,215.3 | $ 7,759.1
[1] | Measured at amortized cost with fair value disclosed.
[2] | Measured at fair value on a recurring basis.

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