v3.25.2
Derivatives and Hedging Activities - Net Gain (Loss) on Derivatives Included in Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives $ (4.5) $ 6.5 $ (41.5) $ 13.7
Net gain on loan origination and sale activities        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives $ (4.5) $ 6.5 $ (41.5) $ 13.7
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net gain on loan origination and sale activities Net gain on loan origination and sale activities Net gain on loan origination and sale activities Net gain on loan origination and sale activities
Loan servicing fees, net        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives $ 6.6 $ (24.2) $ 34.5 $ (66.1)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net loan servicing revenue Net loan servicing revenue Net loan servicing revenue Net loan servicing revenue
Interest rate lock commitments        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives $ 10.8 $ (2.3) $ 25.8 $ (10.3)
Forward Contracts | Net gain on loan origination and sale activities        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives (17.5) 9.3 (73.0) 26.0
Forward Contracts | Loan servicing fees, net        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives (9.3) (11.2) (1.9) (27.5)
Interest rate contracts | Net gain on loan origination and sale activities        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives 2.3 (0.7) 2.3 (2.9)
Interest rate contracts | Loan servicing fees, net        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives 16.5 (16.7) 42.8 (53.0)
Other Contract        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives (0.1) 0.2 3.4 0.9
Future        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Total change in fair value of derivatives $ (0.6) $ 3.7 $ (6.4) $ 14.4