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Other Comprehensive Income/Loss
 3 Months Ended
Mar. 31, 2025
Equity [Abstract]  
Other Comprehensive Income/Loss
The gross amounts of each component of other comprehensive loss and the related tax effects for the periods indicated are as follows:
Pre-taxTax (Expense) BenefitNet of Tax
Three Months Ended March 31,202520242025202420252024
Investment securities available-for sale:
Change in net unrealized gains (losses) during the period$70.7 $(26.4)$(17.7)$6.6 $53.0 $(19.8)
Net change in unamortized losses on available-for-sale securities transferred into held-to-maturity— (0.2)— — — (0.2)
Cash flow hedge:
Change in unrealized gains (losses) on derivatives1.0 (17.4)(0.3)4.4 0.7 (13.0)
Reclassification adjustment for derivatives net losses included in net income1.0 3.5 (0.3)(0.9)0.7 2.6 
Total other comprehensive income (loss)$72.7 $(40.5)$(18.3)$10.1 $54.4 $(30.4)
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
March 31, 2025December 31, 2024
Net unrealized loss on investment securities available-for-sale$(260.6)$(313.6)
Net unrealized loss on investment securities transferred to held-to-maturity(5.9)(5.9)
Net unrealized loss on derivatives(1.0)(2.4)
Net accumulated other comprehensive loss$(267.5)$(321.9)