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Other Comprehensive Income/Loss (Tables)
 9 Months Ended
Sep. 30, 2019
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 September 30,
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
4.2

 
$
(6.3
)
 
$
1.0

 
$
(1.7
)
 
$
3.2

 
$
(4.6
)
Reclassification adjustment for net gains included in net income
(0.1
)
 
—

 
—

 
—

 
(0.1
)
 
—

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

 
0.5

 
—

 
0.1

 
—

 
0.4

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

 
—

 
(0.2
)
 
(0.2
)
Total other comprehensive income (loss)
$
3.9

 
$
(6.0
)
 
$
1.0

 
$
(1.6
)
 
$
2.9

 
$
(4.4
)
 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Nine Months Ended September 30,
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
58.0

 
$
(33.9
)
 
$
15.0

 
$
(8.9
)
 
$
43.0

 
$
(25.0
)
Reclassification adjustment for net gains 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
)
 
—

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

 
1.5

 
—

 
0.4

 
—

 
1.1

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(0.5
)
 
(0.5
)
 
—

 
(0.1
)
 
(0.5
)
 
(0.4
)
Total other comprehensive income (loss)
$
51.4

 
$
(32.9
)
 
$
13.4

 
$
(8.6
)
 
$
38.0

 
$
(24.3
)
Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
September 30, 2019
 
December 31, 2018
Net unrealized gain (loss) on investment securities available-for-sale
$
12.9

 
$
(25.5
)
Net actuarial gain (loss) on defined benefit post-retirement benefit plans
0.5

 
0.9

Net accumulated other comprehensive gain (loss)
$
13.4

 
$
(24.6
)