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Other Comprehensive Income/Loss
 6 Months Ended
Jun. 30, 2019
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,
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
20.2

 
$
(3.9
)
 
$
5.1

 
$
(1.0
)
 
$
15.1

 
$
(2.9
)
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)
$
20.0

 
$
(3.6
)
 
$
5.1

 
$
(0.9
)
 
$
14.9

 
$
(2.7
)
 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Six Months Ended June 30,
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
53.8

 
$
(27.6
)
 
$
14.0

 
$
(7.2
)
 
$
39.8

 
$
(20.4
)
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
—

 
1.0

 
—

 
0.3

 
—

 
0.7

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(0.3
)
 
(0.3
)
 
—

 
(0.1
)
 
(0.3
)
 
(0.2
)
Total other comprehensive income (loss)
$
47.5

 
$
(26.9
)
 
$
12.4

 
$
(7.0
)
 
$
35.1

 
$
(19.9
)

The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
June 30, 2019
 
December 31, 2018
Net unrealized gain (loss) on investment securities available-for-sale
$
9.9

 
$
(25.5
)
Net actuarial gain (loss) on defined benefit post-retirement benefit plans
0.6

 
0.9

Net accumulated other comprehensive gain (loss)
$
10.5

 
$
(24.6
)