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Other Comprehensive Income/Loss
 3 Months Ended
Mar. 31, 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 March 31,
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gains during period
$
33.6

 
$
(23.7
)
 
$
8.8

 
$
(6.2
)
 
$
24.8

 
$
(17.5
)
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
—

 
0.5

 
—

 
0.2

 
—

 
0.3

Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial (gain) loss
(0.2
)
 
(0.1
)
 
—

 
(0.1
)
 
(0.2
)
 
—

Total other comprehensive income (loss)
$
27.4

 
$
(23.3
)
 
$
7.2

 
$
(6.1
)
 
$
20.2

 
$
(17.2
)
 
 
 
 
 
 
 
 
 
 
 
 
The components of accumulated other comprehensive loss, net of related tax effects, are as follows:
 
March 31, 2019
 
December 31, 2018
Net unrealized gain (loss) on investment securities available-for-sale
$
(5.1
)
 
$
(25.5
)
Net actuarial gain (loss) on defined benefit post-retirement benefit plans
0.7

 
0.9

Net accumulated other comprehensive gain (loss)
$
(4.4
)
 
$
(24.6
)