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Other Comprehensive Income
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Other Comprehensive Income
OTHER COMPREHENSIVE INCOME

The gross amounts of each component of other comprehensive income and the related tax effects for the periods indicated are as follows:
Year Ended December 31, 2019
Before Tax Amount
Tax Expense (Benefit)
Net of Tax Amount
Investment securities available-for sale:
 
 
 
Change in net unrealized gain during period
$
54.9

$
14.1

$
40.8

Reclassification adjustment for net gain included in net income
(0.1
)
—

(0.1
)
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
(0.8
)
(0.1
)
(0.7
)
Total other comprehensive income
$
48.0

$
12.4

$
35.6

Year Ended December 31, 2018
Before Tax Amount
Tax Expense (Benefit)
Net of Tax Amount
Investment securities available-for sale:
 
 
 
Change in net unrealized loss during period
$
(13.9
)
$
(3.6
)
$
(10.3
)
Reclassification adjustment for net loss included in net income
0.1

—

0.1

Change in unamortized loss on available-for-sale securities transferred into held-to-maturity
1.6

0.4

1.2

Defined benefits post-retirement benefit plan:
 
 
 
Change in net actuarial gains
(0.6
)
(0.1
)
(0.5
)
Total other comprehensive loss
$
(12.8
)
$
(3.3
)
$
(9.5
)
Year Ended December 31, 2017
Before Tax Amount
Tax Expense (Benefit)
Net of Tax Amount
Investment securities available-for sale:
 
 
 
Change in net unrealized loss during period
$
(6.5
)
$
(2.7
)
$
(3.8
)
Reclassification adjustment for net gain included in net income
(0.7
)
(0.3
)
(0.4
)
Change in unamortized loss on available-for-sale securities transferred into held-to-maturity
1.9

0.7

1.2

Change in net unrealized loss on derivatives
(1.1
)
(0.4
)
(0.7
)
Reclassification adjustment for derivative net loss included in income
1.1

0.4

0.7

Defined benefits post-retirement benefit plan:
 
 
 
Change in net actuarial loss
(1.3
)
(0.5
)
(0.8
)
Total other comprehensive loss
$
(6.6
)
$
(2.8
)
$
(3.8
)


The components of accumulated other comprehensive income (loss), net of income taxes, are as follows:
Year ended December 31,
2019
 
2018
Net unrealized gain (loss) on investment securities available-for-sale
$
10.6

 
$
(25.5
)
Net actuarial gain on defined benefit post-retirement benefit plans
0.4

 
0.9

Net accumulated other comprehensive income (loss)
$
11.0

 
$
(24.6
)