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Other Comprehensive Income/Loss (Tables)
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Schedule of 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 September 30,
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
(6.3
)
 
$
(1.8
)
 
$
(1.7
)
 
$
(0.8
)
 
$
(4.6
)
 
$
(1.0
)
Reclassification adjustment for net gains included in net income
—

 
(0.8
)
 
—

 
(0.3
)
 
—

 
(0.5
)
Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
0.5

 
0.5

 
0.1

 
0.2

 
0.4

 
0.3

Unrealized (gain) loss on derivatives
—

 
(0.6
)
 
—

 
(0.3
)
 
—

 
(0.3
)
Reclassification adjustment for derivatives net (gains) losses included in income
—

 
1.1

 
—

 
0.5

 
—

 
0.6

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

 
(0.1
)
 
(0.2
)
 
(0.1
)
Total other comprehensive income (loss)
$
(6.0
)
 
$
(1.8
)
 
$
(1.6
)
 
$
(0.8
)
 
$
(4.4
)
 
$
(1.0
)
 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Nine Months Ended September 30,
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
(33.9
)
 
$
15.6

 
$
(8.9
)
 
$
6.1

 
$
(25.0
)
 
$
9.5

Reclassification adjustment for net gains included in net income
—

 
(0.8
)
 
—

 
(0.3
)
 
—

 
(0.5
)
Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
1.5

 
1.4

 
0.4

 
0.6

 
1.1

 
0.8

Unrealized (gain) loss on derivatives
—

 
(1.1
)
 
—

 
(0.4
)
 
—

 
(0.7
)
Reclassification adjustment for derivatives net (gains) losses included in income
—

 
1.1

 
—

 
0.4

 
—

 
0.7

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(0.5
)
 
(1.1
)
 
(0.1
)
 
(0.4
)
 
(0.4
)
 
(0.7
)
Total other comprehensive income (loss)
$
(32.9
)
 
$
15.1

 
$
(8.6
)
 
$
6.0

 
$
(24.3
)
 
$
9.1
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
September 30,
2018
 
December 31,
2017
Net unrealized gain (loss) on investment securities available-for-sale
$
(40.3
)
 
$
(13.3
)
Net unrealized gain (loss) on derivatives
—

 
1.3

Net actuarial gain (loss) on defined benefit post-retirement benefit plans
0.9

 
—

Net accumulated other comprehensive gain (loss)
$
(39.4
)
 
$
(12.0
)