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Other Assets (Narrative) (Details)
$ in Millions
Oct. 01, 2021
USD ($)
Employees
Loan
Dec. 31, 2021
USD ($)
Employees
Jun. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]          
Intangible assets   $ 13.7      
Accumulated amortization   $ 0.7      
Total number of employees | Employees   5,700      
UPB of portfolio loans acquired   $ 75,600.0 $ 46,800.0 $ 31,700.0 $ 14,600.0
Intangible assets, gross $ 14.5        
Reverse Mortgage Solutions Inc          
Acquired Finite-Lived Intangible Assets [Line Items]          
Total number of employees | Employees 350        
Number Of Reverse Mortgage Loans Acquired Under SubServicing Agreement | Loan 57,000        
UPB of portfolio loans acquired $ 14,300.0        
Other Payments to Acquire Businesses $ 14.3