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Contingencies - Narrative (Details)
$ in Millions
 1 Months Ended 9 Months Ended
Apr. 30, 2017
state
Sep. 30, 2022
USD ($)
loan
case
issuer
Sep. 30, 2021
USD ($)
loan
Mar. 04, 2021
count
Loss Contingency [Abstract]        
Accrued penalty   $ 47.1    
Number of cases | case   5    
Number of counts granted summary judgement | count       9
Number of states charging with regulatory action | state 29      
Warranty repurchase demands unpaid principal balance   $ 53.3 $ 59.6  
Warranty repurchase demands number of loans | loan   280 301  
Number of mortgage issuers | issuer   5