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Commitments - Schedule of Activity Related to HMBS Repurchases (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security $ 7,621.8  
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 186.0  
Additions, repurchase securities, amount 41.9 $ 91.9
Recoveries, net, repurchase securities, amount (51.1)  
Transfers, repurchase securities, amount 0.0  
Change in value, repurchase securities, amount (1.1)  
Ending balance, repurchase securities, amount 175.7  
Maximum Claim Amount, Less Than 92%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 7,163.9  
Maximum Claim Amount, Greater than 92% and Less Than 95%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 259.9  
Maximum Claim Amount, Greater than 95% and less Than 98%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 198.0  
Active    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 55.4  
Additions, repurchase securities, amount 26.1  
Recoveries, net, repurchase securities, amount (36.6)  
Transfers, repurchase securities, amount 0.8  
Change in value, repurchase securities, amount 0.0  
Ending balance, repurchase securities, amount 45.7  
Inactive    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 130.6  
Additions, repurchase securities, amount 15.8  
Recoveries, net, repurchase securities, amount (14.5)  
Transfers, repurchase securities, amount (0.8)  
Change in value, repurchase securities, amount (1.1)  
Ending balance, repurchase securities, amount $ 130.0