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Other Comprehensive Income/Loss (Tables)
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Schedule of Other Comprehensive Income and Related Tax Effects
The gross amounts of each component of other comprehensive income and the related tax effects are as follows:
 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Three Months Ended March 31,
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
39.2

 
$
33.6

 
$
10.3

 
$
8.8

 
$
28.9

 
$
24.8

Reclassification adjustment for securities transferred from held-to-maturity to available-for-sale
—

 
(6.0
)
 
—

 
(1.6
)
 
—

 
(4.4
)
Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial gains
(0.2
)
 
(0.2
)
 
(0.1
)
 
—

 
(0.1
)
 
(0.2
)
Total other comprehensive income
$
39.0

 
$
27.4

 
$
10.2

 
$
7.2

 
$
28.8

 
$
20.2
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
March 31, 2020
 
December 31, 2019
Net unrealized gains on investment securities available-for-sale
$
39.6

 
$
10.6

Net actuarial gains on defined benefit post-retirement benefit plans
0.2

 
0.4

Net accumulated other comprehensive gains
$
39.8

 
$
11.0