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Other Comprehensive Income and Accumulated Other Comprehensive Income
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Other Comprehensive Income and Accumulated Other Comprehensive Income Other Comprehensive Income 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 months ended March 31, 2020 and 2019:
($ millions)
 
 

Unrealized Gains
and Losses on
Available-for-Sale
 Securities
 
Benefit Plan Items
 
Total
Beginning balance at January 1, 2020
$
40.4

 
$
(78.3
)
 
$
(37.9
)
Other comprehensive income before reclassifications
24.5

 
—

 
24.5

Amounts reclassified from AOCI (a)
(1.9
)
 
1.6

 
(0.3
)
Net current period other comprehensive income
22.6

 
1.6

 
24.2

Ending balance at March 31, 2020
$
63.0

 
$
(76.7
)
 
$
(13.7
)
 
 
 
 
 
 
Beginning balance at January 1, 2019
$
(20.2
)
 
$
(76.2
)
 
$
(96.4
)
Other comprehensive income before reclassifications
27.3

 
—

 
27.3

Amounts reclassified from AOCI (a)
(0.1
)
 
0.6

 
0.5

Net current period other comprehensive income
27.2

 
0.6

 
27.8

Ending balance at March 31, 2019
$
7.0

 
$
(75.6
)
 
$
(68.6
)
 
 
 
 
 
 
 
(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 months ended March 31, 2020 and 2019:
($ millions)
 
 
 
 
 
 
Details about Accumulated Other 
 
Three months ended March 31
 
Affected line item in the Condensed
Comprehensive Income Components
 
 
Consolidated Statements of Income
 
 
2020
 
2019
 
 
Unrealized gains on available-for-sale fixed maturity investments
 
$
2.4

 
$
0.1

 
Realized gains on sale of securities
 
 
2.4

 
0.1

 
Total before tax
 
 
(0.5
)
 
—

 
Tax expense
 
 
1.9

 
0.1

 
Net of tax
Amortization of benefit plan items
 
 
 
 
 
 
Negative prior service cost
 
1.6

 
1.6

 
(b)
Net actuarial loss
 
(3.7
)
 
(2.4
)
 
(b)
 
 
(2.1
)
 
(0.8
)
 
Total before tax
 
 
0.5

 
0.2

 
Tax benefit
 
 
(1.6
)
 
(0.6
)
 
Net of tax
Total reclassifications for the period
 
$
0.3

 
$
(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).