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Receivables - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Delinquent FHA or VA Insured Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Allowance for losses related to defaulted FHA or VA insured loans $ 41.5 $ 38.3