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Contingencies - Schedule of Indemnification Obligations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Indemnification Obligations Liability [Roll Forward]        
Beginning balance     $ 41.6 $ 49.4
Provision for (reversal of) representation and warranty obligations     2.9 1.8
New production liability     1.3 2.3
Charge-offs and other     (8.3) (2.7)
Ending balance $ 37.5 $ 50.8 37.5 50.8
Servicing and subservicing fees $ 237.8 $ 215.6 $ 707.5 $ 643.3