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Reverse Mortgages - Schedule of Loans Held For Investment and HMBS Related Borrowings (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Receivables [Abstract]      
Unpaid principal balance $ 7,664.7 $ 7,261.2  
Fair value adjustments 305.3 242.9  
Loans held for investment - reverse mortgages, beginning balance 7,504.1 7,199.8 $ 6,997.1
Originations 1,033.4 1,658.1 1,763.4
Securitization of HECM loans accounted for as a financing (1,054.6) (1,780.4) (1,674.9)
Additional proceeds from securitization of HECM loans and tails (11.0) (25.2) (44.6)
HMBS related borrowings, acquisitions. 0.0 (209.1)  
Repayments (principal payments received) (1,076.9) (1,579.9) (1,626.4)
Loans held for sale, at fair value (6.1) (8.0) (3.4)
Receivables, net (3.4) 2.1 (0.3)
REO (Other assets) (0.1) (0.4) (0.3)
Change in fair value 519.0 21.1 69.7
Loans held for investment, reverse mortgages, ending balance 7,970.0 7,504.1 7,199.8
HMBS Related Borrowings, Beginning Balance (7,326.8) (6,885.0) (6,772.7)
Repayments (principal payments received) 1,070.1 1,568.4 1,614.3
Change in fair value (475.0) 4.5 (7.1)
HMBS Related Borrowings, Ending Balance (7,797.3) (7,326.8) $ (6,885.0)
Loans held for investment, reverse mortgages, acquisitions. 0.0 211.3  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale ($674.2 and $617.8 carried at fair value) ($269.6 and $0.0 related to VIEs) 7,975.5 7,510.8  
Loans held for sale ($674.2 and $617.8 carried at fair value) ($269.6 and $0.0 related to VIEs) 7,975.5 7,510.8  
Senior Lien      
Receivables [Abstract]      
Loans held for investment - securitized 7,868.5 7,392.6  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment - securitized 7,868.5 7,392.6  
Loans held for sale ($674.2 and $617.8 carried at fair value) ($269.6 and $0.0 related to VIEs) 101.5 111.5  
Loans held for sale ($674.2 and $617.8 carried at fair value) ($269.6 and $0.0 related to VIEs) $ 101.5 $ 111.5