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Commitments and Contingencies (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]      
Loss Contingency, Receivable $ 2.2   $ 22.5
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount 20,500.0   18,300.0
Loan loss accrual 31.1   29.0
Loan loss guarantee reserve 24.8    
Level of risk retained (per claim) 10.0    
Loss Contingency Accrual [Roll Forward]      
Loss Contingency, Receivable 2.2   $ 22.5
Insurance Claims [Member]      
Loss Contingency Accrual [Roll Forward]      
Loss Contingency Accrual 2.2 $ 1.2  
Loss Contingency Accrual, Provision 0.6 0.0  
Loss Contingency Accrual, Provision Adjustment 5.2 (0.1)  
Loss Contingency Accrual, Payments (2.3) (0.2)  
Loss Contingency Accrual $ 5.7 $ 0.9