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Other Comprehensive Income and Accumulated Other Comprehensive Income
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Other Comprehensive Income and Accumulated Other Comprehensive Income Other Comprehensive Income and Accumulated Other Comprehensive Income
The following table sets forth the changes in the Company’s accumulated other comprehensive income component ("AOCI"), net of tax, for the three months ended March 31, 2017 and 2016:
($ millions)
 
 

Unrealized Gains
and Losses on
Available-for-Sale
Securities
 
Benefit Plan Items
 
Total
Beginning balance at January 1, 2017
$
62.8

 
$
(30.3
)
 
$
32.5

 
 
 
 
 
 
Other comprehensive income before reclassifications
20.1

 
—

 
20.1

Amounts reclassified from AOCI (a)
(5.1
)
 
0.4

 
(4.7
)
Net current period other comprehensive income
15.0

 
0.4

 
15.4

Ending balance at March 31, 2017
$
77.8

 
$
(29.9
)
 
$
47.9

 
 
 
 
 
 
Beginning balance at January 1, 2016
$
68.5

 
$
(30.9
)
 
$
37.6

 
 
 
 
 
 
Other comprehensive loss before reclassifications
24.0

 
—

 
24.0

Amounts reclassified from AOCI (a)
(0.8
)
 
0.6

 
(0.2
)
Net current period other comprehensive income
23.2

 
0.6

 
23.8

Ending balance at March 31, 2016
$
91.7

 
$
(30.3
)
 
$
61.4

 
 
 
 
 
 
 
(a)
See separate table below for details about these reclassifications

The following table sets forth the reclassifications out of accumulated other comprehensive income, by component, to the Company’s condensed consolidated statement of income for the three months ended March 31, 2017 and 2016:
($ millions)
 
 
 
 
 
 
Details about Accumulated Other 
 
Three months ended
 
Affected line item in the Condensed
Comprehensive Income Components
 
March 31
 
Consolidated Statements of Income
 
 
2017
 
2016
 
 
Unrealized gains on available for sale securities
 
$
7.8

 
$
1.3

 
Realized gain on sale of securities
 
 
7.8

 
1.3

 
Total before tax
 
 
(2.7
)
 
(0.5
)
 
Tax expense
 
 
5.1

 
0.8

 
Net of tax
Amortization of benefit plan items
 
 
 
 
 
 
Negative prior service cost
 
1.4

 
1.4

 
(b)
Net actuarial loss
 
(2.1
)
 
(2.4
)
 
(b)
 
 
(0.7
)
 
(1.0
)
 
Total before tax
 
 
0.3

 
0.4

 
Tax benefit
 
 
(0.4
)
 
(0.6
)
 
Net of tax
Total reclassifications for the period
 
$
4.7

 
$
0.2

 
 
 
 
 
 
 
 
 
 
(b)
These accumulated other comprehensive income components are included in the computation of net periodic pension cost (see pension and postretirement benefit plans footnote for additional details).