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Other Comprehensive Income/Loss
 6 Months Ended
Jun. 30, 2024
Equity [Abstract]  
Other Comprehensive Income/Loss Other Comprehensive Loss
The gross amounts of each component of other comprehensive loss and the related tax effects are as follows:
Pre-taxTax Expense (Benefit)Net of Tax
Three Months Ended June 30,202420232024202320242023
Investment securities available-for sale:
Change in net unrealized gains (losses) during the period$2.5 $(57.5)$(0.7)$14.4 $1.8 $(43.1)
Reclassification adjustment for net losses included in income— 0.1 — — — 0.1 
Net change in unamortized losses on available-for-sale investment securities transferred into held-to-maturity(0.1)(0.4)— 0.1 (0.1)(0.3)
Cash flow hedge:
Change in unrealized gains on derivatives(5.1)(23.6)1.4 5.9 (3.7)(17.7)
Reclassification adjustment for derivatives net losses included in income4.6 1.5 (1.2)(0.4)3.4 1.1 
Total other comprehensive income (loss)$1.9 $(79.9)$(0.5)$20.0 $1.4 $(59.9)
Pre-taxTax Expense (Benefit)Net of Tax
Six Months Ended June 30,202420232024202320242023
Investment securities available-for sale:
Change in net unrealized gains (losses) during the period$(23.9)$20.7 $5.9 $(5.2)$(18.0)$15.5 
Reclassification adjustment for net losses included in income— 23.5 — (5.8)— 17.7 
Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale— (7.2)— 1.8 — (5.4)
Net change in unamortized losses on available-for-sale investment securities transferred into held-to-maturity(0.3)(0.8)— 0.2 (0.3)(0.6)
Cash flow hedge:
Change in unrealized gains on derivatives(22.5)(14.1)5.8 3.5 (16.7)(10.6)
Reclassification adjustment for derivatives net losses included in income8.1 2.0 (2.1)(0.5)6.0 1.5 
Total other comprehensive income (loss)$(38.6)$24.1 $9.6 $(6.0)$(29.0)$18.1 
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
June 30, 2024December 31, 2023
Net unrealized loss on investment securities available-for-sale$(368.1)$(350.1)
Net unrealized loss on investment securities transferred to held-to-maturity(5.8)(5.6)
Net unrealized loss on derivatives(11.6)(0.8)
Net accumulated other comprehensive loss$(385.5)$(356.5)