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Guarantees - Credit recourse - Additional Information (Details) - Guarantee on loans sold or serviced with credit recourse - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Guarantor Obligations [Line Items]          
Valuation allowances and reserves balance $ 2.0   $ 2.0   $ 3.0
Serviced mortgage loans          
Guarantor Obligations [Line Items]          
Loans serviced 8,400.0   8,400.0   9,000.0
Loans with recourse | Serviced mortgage loans          
Guarantor Obligations [Line Items]          
Repurchased loans 0.2 $ 0.5 1.1 $ 1.5  
Loans with recourse | Residential mortgage loans          
Guarantor Obligations [Line Items]          
Loans serviced $ 445.0   $ 445.0   $ 495.0