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Contingencies - Narrative (Details)
$ in Millions
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Commitments and Contingencies Disclosure [Abstract]        
Accrued legal fees and settlements $ 8.3 $ 42.2    
Outstanding representation and warranty repurchase demands $ 20.7 $ 66.7    
Outstanding representation and warranty repurchase demands, number of loans | loan 71 354    
Representation warranty and compensatory fees obligations $ 32.9 $ 41.5 $ 49.4 $ 40.4