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Other Comprehensive Income/Loss
 3 Months Ended
Mar. 31, 2018
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 March 31,
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
(23.7
)
 
$
9.3

 
$
(6.2
)
 
$
3.7

 
$
(17.5
)
 
$
5.6

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

 
0.5

 
0.2

 
0.2

 
0.3

 
0.3

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(0.1
)
 
(0.7
)
 
(0.1
)
 
(0.3
)
 
—

 
(0.4
)
Total other comprehensive income
$
(23.3
)
 
$
9.1

 
$
(6.1
)
 
$
3.6

 
$
(17.2
)
 
$
5.5

 
 
 
 
 
 
 
 
 
 
 
 
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
March 31,
2018
 
December 31,
2017
Net unrealized gain (loss) on investment securities available-for-sale
$
(33.5
)
 
$
(13.3
)
Net unrealized gain (loss) on derivatives
—

 
1.3

Net actuarial gain (loss) on defined benefit post-retirement benefit plans
1.2

 
—

Net accumulated other comprehensive gain (loss)
$
(32.3
)
 
$
(12.0
)