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Commitments - Schedule of Activity Related to HMBS Repurchases (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security $ 7,488.1  
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 178.4  
Additions, repurchase securities, amount 224.9 $ 154.3
Recoveries, net, repurchase securities, amount (230.1)  
Transfers, repurchase securities, amount 0.0  
Change in value, repurchase securities, amount (3.2)  
Ending balance, repurchase securities, amount 170.0  
Maximum Claim Amount, Less Than 92%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 7,053.3  
Maximum Claim Amount, Greater than 92% and Less Than 95%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 211.9  
Maximum Claim Amount, Greater than 95% and less Than 98%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 222.9  
Active    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 70.7  
Additions, repurchase securities, amount 159.3  
Recoveries, net, repurchase securities, amount (187.9)  
Transfers, repurchase securities, amount 3.8  
Change in value, repurchase securities, amount 0.3  
Ending balance, repurchase securities, amount 46.2  
Inactive    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 107.7  
Additions, repurchase securities, amount 65.6  
Recoveries, net, repurchase securities, amount (42.2)  
Transfers, repurchase securities, amount (3.8)  
Change in value, repurchase securities, amount (3.4)  
Ending balance, repurchase securities, amount $ 123.9