Fair Value Measurements - Narrative (Details) $ in Millions	Jun. 30, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost of non-recourse securitization obligations	$ 981.2
Fair value of non-recourse securitization obligations	916.6
Difference between amortized cost and fair value of non-recourse securitization obligations	64.6
Residential mortgage loans in securitization trust
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Difference between amortized cost and fair value of non-recourse securitization obligations	$ 32.8