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Other Comprehensive Income/Loss
 3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Other Comprehensive Income/Loss Other Comprehensive Income/Loss
The gross amounts of each component of other comprehensive income and the related tax effects are as follows:
Pre-taxTax Expense (Benefit)Net of Tax
Three Months Ended March 31,202120202021202020212020
Investment securities available-for sale:
Change in net unrealized (loss) gain during period$(66.8)$39.2 $(17.0)$10.3 $(49.8)$28.9 
Unrealized gain on derivatives(0.1)— — — (0.1)— 
Defined benefits post-retirement benefit plan:
Change in net actuarial gains— (0.2)— (0.1)— (0.1)
Total other comprehensive (loss) income$(66.9)$39.0 $(17.0)$10.2 $(49.9)$28.8 

The components of accumulated other comprehensive income, net of related tax effects, are as follows:
March 31, 2021December 31, 2020
Net unrealized gains on investment securities available-for-sale$6.8 $56.8 
Net unrealized loss on derivatives(0.1)(0.2)
Net accumulated other comprehensive gains$6.7 $56.6