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Contingencies - Schedule of Indemnification Obligations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Indemnification Obligations Liability [Roll Forward]    
Beginning balance $ 32.9 $ 41.6
Provision for (reversal of) representation and warranty obligations (0.3) 2.7
Provision for representation and warranty obligations - New production liability 0.3 0.3
Charge-offs and other 1.8 (2.7)
Ending balance 34.7 41.9
Servicing and subservicing fees $ 204.5 $ 232.2