Fair Value Measurements - Narrative (Details) $ in Millions	Mar. 31, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized cost of non-recourse securitization obligations	$ 1,050.0
Fair value of non-recourse securitization obligations	1,010.0
Difference between amortized cost and fair value of non-recourse securitization obligations	40.2
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	$ 22.7