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Other Comprehensive Income/Loss
 3 Months Ended
Mar. 31, 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 March 31,202420232024202320242023
Investment securities available-for sale:
Change in net unrealized (losses) gains during the period$(26.4)$78.2 $(6.6)$19.6 $(19.8)$58.6 
Reclassification adjustment for net losses included in income— 23.4 — 5.8 — 17.6 
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(0.2)(0.4)— (0.1)(0.2)(0.3)
Change in unrealized (gains) losses on derivatives(13.9)10.0 (3.5)2.5 (10.4)7.5 
Total other comprehensive (loss) income
$(40.5)$104.0 $(10.1)$26.0 $(30.4)$78.0 

The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
March 31, 2024December 31, 2023
Net unrealized loss on investment securities available-for-sale$(369.9)$(350.1)
Net unrealized loss on investment securities transferred to held-to-maturity(5.7)(5.6)
Net unrealized loss on derivatives(11.3)(0.8)
Net accumulated other comprehensive loss$(386.9)$(356.5)