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Other Comprehensive Income/Loss (Tables)
 6 Months Ended
Jun. 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 June 30,
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
(3.8
)
 
$
8.0

 
$
(1.0
)
 
$
3.3

 
$
(2.8
)
 
$
4.7

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
—

 
(0.5
)
 
—

 
(0.2
)
 
—

 
(0.3
)
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)
$
(3.5
)
 
$
7.8

 
$
(0.9
)
 
$
3.2

 
$
(2.6
)
 
$
4.6

 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Six Months Ended June 30,
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
(27.6
)
 
$
17.4

 
$
(7.2
)
 
$
7.0

 
$
(20.4
)
 
$
10.4

Change in unamortized loss on available-
 for-sale securities transferred into held-to-
 maturity
1.0

 
0.9

 
0.3

 
0.4

 
0.7

 
0.5

Unrealized (gain) loss on derivatives
—

 
(0.5
)
 
—

 
(0.2
)
 
—

 
(0.3
)
Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(0.3
)
 
(0.9
)
 
(0.1
)
 
(0.4
)
 
(0.2
)
 
(0.5
)
Total other comprehensive income (loss)
$
(26.9
)
 
$
16.9

 
$
(7.0
)
 
$
6.8

 
$
(19.9
)
 
$
10.1
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
June 30,
2018
 
December 31,
2017
Net unrealized gain (loss) on investment securities available-for-sale
$
(36.0
)
 
$
(13.3
)
Net unrealized gain (loss) on derivatives
—

 
1.3

Net actuarial gain (loss) on defined benefit post-retirement benefit plans
1.0

 
—

Net accumulated other comprehensive gain (loss)
$
(35.0
)
 
$
(12.0
)