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Commitments - Schedule of Activity Related to HMBS Repurchases (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security $ 7,772.9  
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 186.0  
Additions, repurchase securities, amount 125.0 $ 224.9
Recoveries, net, repurchase securities, amount (122.4)  
Transfers, repurchase securities, amount 0.0  
Change in value, repurchase securities, amount (3.2)  
Ending balance, repurchase securities, amount 185.4  
Maximum Claim Amount, Less Than 92%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 7,236.1  
Maximum Claim Amount, Greater than 92% and Less Than 95%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 276.8  
Maximum Claim Amount, Greater than 95% and less Than 98%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 260.1  
Active    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 55.4  
Additions, repurchase securities, amount 74.0  
Recoveries, net, repurchase securities, amount (81.1)  
Transfers, repurchase securities, amount 2.4  
Change in value, repurchase securities, amount 0.2  
Ending balance, repurchase securities, amount 51.0  
Inactive    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 130.6  
Additions, repurchase securities, amount 51.0  
Recoveries, net, repurchase securities, amount (41.3)  
Transfers, repurchase securities, amount (2.4)  
Change in value, repurchase securities, amount (3.4)  
Ending balance, repurchase securities, amount $ 134.4