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Other Comprehensive Income and Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) The following tables set forth the changes in the Company’s accumulated other comprehensive income component (AOCI), net of tax, for the years ended December 31, 2016, 2015 and 2014:
($ millions)
 
 

Unrealized Gains and Losses on Available-for-Sale Securities
 
Benefit Plan Items
 
Total
Beginning balance at January 1, 2016
$
68.5

 
$
(30.9
)
 
$
37.6

Other comprehensive income before reclassifications
18.0

 
(3.0
)
 
15.0

Amounts reclassified from AOCI (a)
(23.7
)
 
3.6

 
(20.1
)
Net current period other comprehensive income
(5.7
)
 
0.6

 
(5.1
)
Ending balance at December 31, 2016
$
62.8

 
$
(30.3
)
 
$
32.5

 
 
 
 
 
 
 
Beginning balance at January 1, 2015
$
110.0

 
$
(38.3
)
 
$
71.7

Other comprehensive income before reclassifications
(25.4
)
 
5.3

 
(20.1
)
Amounts reclassified from AOCI (a)
(16.1
)
 
2.1

 
(14.0
)
Net current period other comprehensive income
(41.5
)
 
7.4

 
(34.1
)
Ending balance at December 31, 2015
$
68.5

 
$
(30.9
)
 
$
37.6

 
 
 
 
 
 
 
Beginning balance at January 1, 2014
$
84.6

 
$
(3.8
)
 
$
80.8

Other comprehensive income before reclassifications
38.9

 
(54.4
)
 
(15.5
)
Amounts reclassified from AOCI (a)
(13.5
)
 
19.9

 
6.4

Net current period other comprehensive income
25.4

 
(34.5
)
 
(9.1
)
Ending balance at December 31, 2014
$
110.0

 
$
(38.3
)
 
$
71.7

 
 
 
 
 
 
 
(a)
See separate table below for details about these reclassifications
Reclassification out of Accumulated Other Comprehensive Income The following tables set forth the reclassifications out of accumulated other comprehensive income, by component, to the Company’s consolidated statement of income for the years ended December 31, 2016, 2015 and 2014:
($ millions)
 
 
 
 
 
 
 
 
Details about Accumulated Other 
 
December 31
 
Affected line item in the Condensed
Comprehensive Income Components
 
2016
 
2015
 
2014
 
Consolidated Statements of Income
Unrealized gains on available for sale securities
 
$
36.5

 
$
24.7

 
$
20.7

 
Realized gain on sale of securities
 
 
 
36.5

 
24.7

 
20.7

 
Total before tax
 
 
 
(12.8
)
 
(8.6
)
 
(7.2
)
 
Tax expense
 
 
 
23.7

 
16.1

 
13.5

 
Net of tax
Amortization of benefit plan items:
 
 
 
 
 
 
 
 
Negative prior service costs
 
5.5

 
5.4

 
5.5

 
(a)
Net loss
 
(9.4
)
 
(11.5
)
 
(6.9
)
 
(a)
 
 
 
(3.9
)
 
(6.1
)
 
(1.4
)
 
Total before tax
 
 
 
0.3

 
4.0

 
(18.5
)
 
Tax benefit (expense)
 
 
 
(3.6
)
 
(2.1
)
 
(19.9
)
 
Net of tax
Total reclassifications for the period
 
$
20.1

 
$
14.0

 
$
(6.4
)
 
 
 
 
 
 
 
 
 
 
 
 
(a)
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).