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Other Comprehensive Income/Loss
 6 Months Ended
Jun. 30, 2020
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-tax
 
Tax Expense (Benefit)
 
Net of Tax
Three Months Ended June 30,
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
34.9

 
$
20.2

 
$
9.5

 
$
5.1

 
$
25.4

 
$
15.1

Unrealized loss on derivatives
0.2

 
—

 
—

 
—

 
0.2

 
—

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

 
—

 
(0.2
)
 
(0.2
)
Total other comprehensive income
$
34.9

 
$
20.0

 
$
9.5

 
$
5.1

 
$
25.4

 
$
14.9

 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Six Months Ended June 30,
2020
 
2019
 
2020
 
2019
 
2020
 
2019
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
74.1

 
$
53.8

 
$
19.8

 
$
14.0

 
$
54.3

 
$
39.8

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

 
(6.0
)
 
—

 
(1.6
)
 
—

 
(4.4
)
Unrealized loss on derivatives
0.2

 
—

 
—

 
—

 
0.2

 
—

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial gains
(0.4
)
 
(0.3
)
 
(0.1
)
 
—

 
(0.3
)
 
(0.3
)
Total other comprehensive income
$
73.9

 
$
47.5

 
$
19.7

 
$
12.4

 
$
54.2

 
$
35.1


The components of accumulated other comprehensive income, net of related tax effects, are as follows:
 
June 30, 2020
 
December 31, 2019
Net unrealized gains on investment securities available-for-sale
$
65.3

 
$
10.6

Net unrealized loss on derivatives
(0.2
)
 
—

Net actuarial gains on defined benefit post-retirement benefit plans
0.1

 
0.4

Net accumulated other comprehensive gains
$
65.2

 
$
11.0