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LOAN SERVICING - Schedule of Mortgage Servicing Rights Activity (Details) - Mortgage Servicing Rights - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Servicing Assets at Fair Value [Line Items]      
Mortgage loans sold with servicing retained $ 7,062.0 $ 6,429.0  
Mortgage loans sold with servicing retained 1,382.0 1,280.0 $ 980.0
Pre-tax net gains (losses) resulting from above loan sales 22.0 21.0 3.0
Mortgage servicing fees 17.0 15.0 14.0
Servicing Asset at Amortized Cost, Balance [Roll Forward]      
Balance at beginning of period 70.5 59.5 52.8
Additions 14.5 16.6 11.3
Payoffs and curtailments (5.2) (3.4) (2.2)
Impairment (charge) / recovery 0.0 0.1 (0.2)
Amortization / other (6.3) (2.3) (2.2)
Balance at end of period 73.5 70.5 59.5
Fair value, beginning of period 86.3 71.8 68.6
Fair value, end of period 88.2 86.3 $ 71.8
Valuation allowance for servicing rights $ 0.1 $ 0.1