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Other Comprehensive Income/Loss (Tables)
9 Months Ended
Sep. 30, 2024
Equity [Abstract]  
Schedule of Other Comprehensive Income and Related Tax Effects
The gross amounts of each component of other comprehensive loss and the related tax effects are as follows:
Pre-taxTax (Expense) BenefitNet of Tax
Three Months Ended September 30,202420232024202320242023
Investment securities available-for sale:
Change in net unrealized gains (losses) during the period$158.5 $(72.1)$(39.4)$17.9 $119.1 $(54.2)
Net change in unamortized losses on available-for-sale investment securities transferred into held-to-maturity(0.2)(0.3)— 0.1 (0.2)(0.2)
Cash flow hedge:
Change in unrealized gains (losses) on derivatives12.4 (13.1)(3.0)3.2 9.4 (9.9)
Reclassification adjustment for derivatives net losses included in income3.1 2.1 (0.8)(0.5)2.3 1.6 
Total other comprehensive income (loss)$173.8 $(83.4)$(43.2)$20.7 $130.6 $(62.7)
Pre-taxTax (Expense) BenefitNet of Tax
Nine Months Ended September 30,202420232024202320242023
Investment securities available-for sale:
Change in net unrealized gains (losses) during the period$134.6 $(51.4)$(33.5)$12.7 $101.1 $(38.7)
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(0.5)(1.1)— 0.3 (0.5)(0.8)
Cash flow hedge:
Change in unrealized gains on derivatives(10.1)(27.2)2.8 6.7 (7.3)(20.5)
Reclassification adjustment for derivatives net losses included in income11.2 4.1 (2.9)(1.0)8.3 3.1 
Total other comprehensive income (loss)$135.2 $(59.3)$(33.6)$14.7 $101.6 $(44.6)
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
September 30, 2024December 31, 2023
Net unrealized loss on investment securities available-for-sale$(249.0)$(350.1)
Net unrealized loss on investment securities transferred to held-to-maturity(5.9)(5.6)
Net unrealized loss on derivatives— (0.8)
Net accumulated other comprehensive loss$(254.9)$(356.5)