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Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Comprehensive Income (Loss)
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, 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 loss (gain)
(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 gains 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 (gains) losses included in net income
1.1

0.4

0.7

Defined benefits post-retirement benefit plan:
 
 
 
Change in net actuarial loss (gain)
(1.3
)
(0.5
)
(0.8
)
Total other comprehensive loss
$
(6.6
)
$
(2.8
)
$
(3.8
)
Year Ended December 31, 2016
Before Tax Amount
Tax Expense (Benefit)
Net of Tax Amount
Investment securities available-for sale:
 
 
 
Change in net unrealized loss during period
$
(19.4
)
$
(7.6
)
$
(11.8
)
Reclassification adjustment for net gains included in net income
(0.3
)
(0.1
)
(0.2
)
Change in unamortized gain on available-for-sale securities transferred into held-to-maturity
1.9

0.7

1.2

Change in net unrealized loss on derivatives
(0.2
)
(0.1
)
(0.1
)
Defined benefits post-retirement benefit plan:
 
 
 
Change in net actuarial loss (gain)
3.9

1.6

2.3

Total other comprehensive income
$
(14.1
)
$
(5.5
)
$
(8.6
)
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive income (loss), net of income taxes, are as follows:
Year ended December 31,
2018
 
2017
Net unrealized gain (loss) on investment securities available-for-sale
$
(25.5
)
 
$
(13.3
)
Net actuarial gain (loss) on defined benefit post-retirement benefit plans
0.9

 
1.3

Net accumulated other comprehensive income (loss)
$
(24.6
)
 
$
(12.0
)