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Contingencies - Schedule of Indemnification Obligations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Indemnification Obligations Liability [Roll Forward]        
Beginning balance     $ 41.6 $ 49.4
Provision for (reversal of) representation and warranty obligations     2.1 (2.2)
New production liability     0.6 1.4
Charge-offs and other     (6.2) (5.9)
Ending balance $ 38.1 $ 42.7 38.1 42.7
Servicing and subservicing fees $ 237.6 $ 215.1 $ 469.7 $ 427.8