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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Comprehensive Income (Loss)
The components of Other Comprehensive Income (Loss) Before Income Taxes for the years ended December 31, 2017, 2016 and 2015 were:
DOLLARS IN MILLIONS
 
2017
 
2016
 
2015
Other Comprehensive Income (Loss) Before Income Taxes:
 
 
 
 
 
 
Unrealized Holding Gains (Losses) Arising During the Year Before Reclassification Adjustment
 
$
119.1

 
$
(2.4
)
 
$
(151.9
)
Reclassification Adjustment for Amounts Included in Net Income
 
(35.3
)
 
0.2

 
(25.4
)
Unrealized Holding Gains (Losses)
 
83.8

 
(2.2
)
 
(177.3
)
Foreign Currency Translation Adjustments Arising During the Year Before Reclassification Adjustment
 
1.7

 
(0.3
)
 
(1.4
)
Reclassification Adjustment for Amounts Included in Net Income
 
—

 
—

 
—

Foreign Currency Translation Adjustments
 
1.7

 
(0.3
)
 
(1.4
)
Net Unrecognized Postretirement Benefit Costs Arising During the Year
 
3.9

 
14.2

 
3.0

Reclassification Adjustments for Amounts Included in Net Income:
 
 
 
 
 
 
Curtailment Cost Recognized
 
—

 
1.0

 
—

Amortization of Net Unrecognized Postretirement Benefit Costs
 
(0.6
)
 
5.3

 
23.1

Total Reclassification Adjustments for Amounts Included in Net Income
 
(0.6
)
 
6.3

 
23.1

Net Unrecognized Postretirement Benefit Costs
 
3.3

 
20.5

 
26.1

Gains (Losses) on Cash Flow Hedges During the Year Before Reclassification Adjustment
 
(8.0
)
 
1.6

 
—

Reclassification Adjustment for Amounts Included in Net Income
 
1.3

 
—

 
—

Gain (Loss) on Cash Flow Hedges
 
(6.7
)
 
1.6

 
—

Other Comprehensive Income (Loss) Before Income Taxes
 
$
82.1

 
$
19.6

 
$
(152.6
)

NOTE 12. OTHER COMPREHENSIVE INCOME (LOSS) AND ACCUMULATED OTHER COMPREHENSIVE INCOME (Continued)
The components of Other Comprehensive Income Tax Benefit (Expense) for the years ended December 31, 2017, 2016 and 2015 were:
DOLLARS IN MILLIONS
 
2017
 
2016
 
2015
Income Tax Benefit (Expense):
 
 
 
 
 
 
Unrealized Holding Gains and Losses Arising During the Year Before Reclassification Adjustment
 
$
(38.2
)
 
$
1.0

 
$
53.9

Reclassification Adjustment for Amounts Included in Net Income
 
12.3

 
(0.1
)
 
8.9

Unrealized Holding Gains and Losses
 
(25.9
)
 
0.9

 
62.8

Foreign Currency Translation Adjustments Arising During the Year Before Reclassification Adjustment
 
(0.6
)
 
0.1

 
0.5

Reclassification Adjustment for Amounts Included in Net Income
 
—

 
—

 
—

Foreign Currency Translation Adjustment
 
(0.6
)
 
0.1

 
0.5

Net Unrecognized Postretirement Benefit Costs Arising During the Year
 
(0.8
)
 
(5.0
)
 
(1.1
)
Reclassification Adjustments for Amounts Included in Net Income:
 
 
 
 
 
 
Curtailment Cost Recognized
 
—

 
(0.4
)
 
—

Amortization of Net Unrecognized Postretirement Benefit Costs
 
0.2

 
(1.9
)
 
(8.0
)
Total Reclassification Adjustments for Amounts Included in Net Income
 
0.2

 
(2.3
)
 
(8.0
)
Net Unrecognized Postretirement Benefit Costs
 
(0.6
)
 
(7.3
)
 
(9.1
)
Gains and Losses on Cash Flow Hedges During the Year Before Reclassification Adjustment
 
2.8

 
(0.6
)
 
—

Reclassification Adjustment for Amounts Included in Net Income
 
(0.4
)
 
—

 
—

Gains and Losses on Cash Flow Hedges
 
2.4

 
(0.6
)
 
—

Other Comprehensive Income Tax Benefit (Expense)
 
$
(24.7
)
 
$
(6.9
)
 
$
54.2
Schedule of Accumulated Other Comprehensive Income (Loss)
The components of AOCI at December 31, 2017 and 2016 were:
DOLLARS IN MILLIONS
 
2017
 
2016
Net Unrealized Gains on Investments, Net of Income Taxes:
 
 
 
 
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings
 
$
0.2

 
$
0.1

Other Net Unrealized Gains on Investments
 
269.5

 
211.7

Foreign Currency Translation Adjustments, Net of Income Taxes
 
0.2

 
(0.9
)
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes
 
(72.2
)
 
(74.9
)
Gain (Loss) on Cash Flow Hedges, Net of Income Taxes
 
(3.3
)
 
1.0

Accumulated Other Comprehensive Income
 
$
194.4

 
$
137.0
Reclassification out of Accumulated Other Comprehensive Income
DOLLARS IN MILLIONS
 
2017
 
2016
 
2015
Reclassification of AOCI from Net Unrealized Gains and Losses on Available For Sale Securities to:
 
 
 
 
 
 
Net Realized Gains on Sales of Investments
 
$
49.6

 
$
32.0

 
$
52.6

Net Impairment Losses Recognized in Earnings
 
(14.3
)
 
(32.2
)
 
(27.2
)
Total Before Income Taxes
 
35.3

 
(0.2
)
 
25.4

Income Tax Benefit (Expense)
 
(12.3
)
 
0.1

 
(8.9
)
Reclassification from AOCI, Net of Income Taxes
 
23.0

 
(0.1
)
 
16.5

Reclassification of AOCI Unrecognized Postretirement Benefit Costs to:
 
 
 
 
 
 
Interest and Other Expenses
 
0.6

 
(6.3
)
 
(23.1
)
Income Tax Benefit (Expense)
 
(0.2
)
 
2.3

 
8.0

Reclassification from AOCI, Net of Income Taxes
 
0.4

 
(4.0
)
 
(15.1
)
Reclassification of AOCI from Loss on Cash Flow Hedges to:
 
 
 
 
 
 
Interest and Other Expenses
 
(1.3
)
 
—

 
—

Income Tax Benefit
 
0.4

 
—

 
—

Reclassification from AOCI, Net of Income Taxes
 
(0.9
)
 
—

 
—

Total Reclassification from AOCI to Net Income
 
$
22.5

 
$
(4.1
)
 
$
1.4