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Other Comprehensive Income/Loss - Schedule of Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Investment securities available-for sale:                
Change in net unrealized gain during period, pre-tax $ 38.1 $ 158.5 $ 153.5 $ 134.6        
Change in net unrealized gain during period, tax expense (benefit) (9.5) (39.4) (38.3) (33.5)        
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax 28.6 119.1 115.2 101.1        
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax 0.1 (0.2) 0.0 (0.5)        
Unrealized loss on derivatives, tax expense (benefit) (0.1) (0.8) (0.5) (2.9)        
Unrealized loss on derivatives, net of tax 0.0 9.4 1.5 (7.3)        
Other comprehensive income, before tax 38.4 173.8 157.0 135.2        
Other Comprehensive Income (Loss), tax expense (benefit) (9.6) (43.2) (39.2) (33.6)        
Other Comprehensive Income (Loss), Net of Tax 28.8 130.6 117.8 101.6        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0.0 12.4 1.9 (10.1)        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0.2 3.1 1.6 11.2        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 0.1 2.3 1.1 8.3        
Total stockholders’ equity 3,448.7 3,365.8 3,448.7 3,365.8 $ 3,421.8 $ 3,304.0 $ 3,225.3 $ 3,227.5
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax 0.1 (0.2) 0.0 (0.5)        
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit) 0.0 0.0 0.0 0.0        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax $ 0.0 $ (3.0) $ (0.4) $ 2.8