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Other Comprehensive Income and Accumulated Other Comprehensive Income
 9 Months Ended
Sep. 30, 2018
Equity [Abstract]  
Other Comprehensive Income and Accumulated Other Comprehensive Income Other Comprehensive Loss and Accumulated Other Comprehensive Loss
The following tables set forth the changes in the Company’s accumulated other comprehensive (loss) income ("AOC(L)I"), net of tax, for the three and nine months ended September 30, 2018 and 2017:
($ millions)
 
 

Unrealized Gains
and Losses on
Available-for-Sale
 Securities
 
Benefit Plan Items
 
Total
Beginning balance at July 1, 2018
$
(20.3
)
 
$
(37.0
)
 
$
(57.3
)
Other comprehensive loss before reclassifications
(11.6
)
 
—

 
(11.6
)
Amounts reclassified from AOCI (a)
—

 
0.6

 
0.6

Net current period other comprehensive (loss) income
(11.6
)
 
0.6

 
(11.0
)
Ending balance at September 30, 2018
$
(31.9
)
 
$
(36.4
)
 
$
(68.3
)
 
 
 
 
 
 
Beginning balance at July 1, 2017
$
83.0

 
$
(29.6
)
 
$
53.4

Other comprehensive income before reclassifications
7.2

 
—

 
7.2

Amounts reclassified from AOCI (a)
(13.2
)
 
0.5

 
(12.7
)
Net current period other comprehensive (loss) income
(6.0
)
 
0.5

 
(5.5
)
Ending balance at September 30, 2017
$
77.0

 
$
(29.1
)
 
$
47.9

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

($ millions)
 
 

Unrealized Gains
and Losses on
Available-for-Sale
 Securities
 
Benefit Plan Items
 
Total
Beginning balance at January 1, 2018
$
66.0

 
$
(29.3
)
 
$
36.7

Cumulative effect of change in accounting for equity securities and other invested assets and reclassification of stranded tax effects as of January 1, 2018
(47.9
)
 
(8.9
)
 
(56.8
)
Adjusted beginning balance at January 1, 2018
18.1

 
(38.2
)
 
(20.1
)
Other comprehensive loss before reclassifications
(48.7
)
 
—

 
(48.7
)
Amounts reclassified from AOCI (a)
(1.3
)
 
1.8

 
0.5

Net current period other comprehensive (loss) income
(50.0
)
 
1.8

 
(48.2
)
Ending balance at September 30, 2018
$
(31.9
)
 
$
(36.4
)
 
$
(68.3
)
 
 
 
 
 
 
Beginning balance at January 1, 2017
$
62.8

 
$
(30.3
)
 
$
32.5

Other comprehensive income before reclassifications
42.7

 
—

 
42.7

Amounts reclassified from AOCI (a)
(28.5
)
 
1.2

 
(27.3
)
Net current period other comprehensive income
14.2

 
1.2

 
15.4

Ending balance at September 30, 2017
$
77.0

 
$
(29.1
)
 
$
47.9

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

The following tables set forth the reclassifications out of accumulated other comprehensive income, by component, to the Company’s condensed consolidated statement of income for the three and nine months ended September 30, 2018 and 2017:
($ millions)
 
 
 
 
Details about Accumulated Other 
 
Three months ended
 
Affected line item in the Condensed
Comprehensive Income Components
 
September 30
 
Consolidated Statements of Income
 
 
2018
 
 
Unrealized gains on available-for-sale fixed maturity investments
 
$
—

 
Realized gain on sale of securities
 
 
—

 
Total before tax
 
 
—

 
Tax expense
 
 
—

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

 
(b)
Net actuarial loss
 
(2.2
)
 
(b)
 
 
(0.8
)
 
Total before tax
 
 
0.2

 
Tax benefit
 
 
(0.6
)
 
Net of tax
Total reclassifications for the period
 
$
(0.6
)
 
 
 
 
 
 
 
 
(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).
 
 
 
 
 
 
($ millions)
 
 
 
 
Details about Accumulated Other 
 
Nine months ended
 
Affected line item in the Condensed
Comprehensive Income Components
 
September 30
 
Consolidated Statements of Income
 
 
2018
 
 
Unrealized gains on available-for-sale fixed maturity investments
 
$
1.7

 
Realized gains on sale of securities
 
 
1.7

 
Total before tax
 
 
(0.4
)
 
Tax expense
 
 
1.3

 
Net of tax
Amortization of benefit plan items
 
 
 
 
Negative prior service cost
 
4.1

 
(b)
Net actuarial loss
 
(6.4
)
 
(b)
 
 
(2.3
)
 
Total before tax
 
 
0.5

 
Tax benefit
 
 
(1.8
)
 
Net of tax
Total reclassifications for the period
 
$
(0.5
)
 
 
 
 
 
 
 
 
(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).

($ millions)
 
 
 
 
Details about Accumulated Other 
 
Three months ended
 
Affected line item in the Condensed
Comprehensive Income Components
 
September 30
 
Consolidated Statements of Income
 
 
2017
 
 
Unrealized gains on available for sale securities
 
$
20.2

 
Realized gain on sale of securities
 
 
20.2

 
Total before tax
 
 
(7.0
)
 
Tax expense
 
 
13.2

 
Net of tax
Amortization of benefit plan items
 
 
 
 
Negative prior service cost
 
1.3

 
(b)
Net actuarial loss
 
(2.1
)
 
(b)
 
 
(0.8
)
 
Total before tax
 
 
0.3

 
Tax benefit
 
 
(0.5
)
 
Net of tax
Total reclassifications for the period
 
$
12.7

 
 
 
 
 
 
 
 
(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).
 
 
 
 
 
 
($ millions)
 
 
 
 
Details about Accumulated Other 
 
Nine Months Ended
 
Affected line item in the Condensed
Comprehensive Income Components
 
September 30
 
Consolidated Statements of Income
 
 
2017
 
 
Unrealized gains on available for sale securities
 
$
43.8

 
Realized gain on sale of securities
 
 
43.8

 
Total before tax
 
 
(15.3
)
 
Tax expense
 
 
28.5

 
Net of tax
Amortization of benefit plan items
 
 
 
 
Negative prior service cost
 
4.1

 
(b)
Net actuarial loss
 
(6.1
)
 
(b)
 
 
(2.0
)
 
Total before tax
 
 
0.8

 
Tax benefit
 
 
(1.2
)
 
Net of tax
Total reclassifications for the period
 
$
27.3

 
 
 
 
 
 
 
 
(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).