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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]  
Schedule of Comprehensive Income [Table Text Block]
The components of Other Comprehensive Income (Loss) Before Income Taxes for the six and three months ended June 30, 2018 and 2017 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2018
 
Jun 30,
2017
 
Jun 30,
2018
 
Jun 30,
2017
Other Comprehensive Income (Loss) Before Income Taxes:
 
 
 
 
 
 
 
 
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment
 
$
(181.0
)
 
$
91.3

 
$
(61.5
)
 
$
57.7

Reclassification Adjustment for Amounts Included in Net Income
 
(1.2
)
 
(24.1
)
 
0.7

 
(19.0
)
Unrealized Holding Gains (Losses)
 
(182.2
)
 
67.2

 
(60.8
)
 
38.7

Foreign Currency Translation Adjustments
 
0.3

 
0.8

 
1.2

 
0.7

Net Unrecognized Postretirement Benefit Costs
 
0.6

 
(0.3
)
 
0.3

 
(0.2
)
Gain (Loss) on Cash Flow Hedges During the Period Before Reclassification Adjustment
 
(0.1
)
 
(7.6
)
 
(0.7
)
 
(5.6
)
Reclassification Adjustment for Amounts Included in Net Income
 
0.3

 
1.1

 
—

 
1.1

Gain (Loss) on Cash Flow Hedges
 
0.2

 
(6.5
)
 
(0.7
)
 
(4.5
)
Other Comprehensive Income (Loss) Before Income Taxes
 
$
(181.1
)
 
$
61.2

 
$
(60.0
)
 
$
34.7

The components of Other Comprehensive Income Tax Benefit (Expense) for the six and three months ended June 30, 2018 and 2017 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2018
 
Jun 30,
2017
 
Jun 30,
2018
 
Jun 30,
2017
Other Comprehensive Income Tax Benefit (Expense):
 
 
 
 
 
 
 
 
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment
 
$
38.0

 
$
(32.1
)
 
$
13.0

 
$
(20.2
)
Reclassification Adjustment for Amounts Included in Net Income
 
0.3

 
8.4

 
(0.1
)
 
6.6

Unrealized Holding Gains
 
38.3

 
(23.7
)
 
12.9

 
(13.6
)
Foreign Currency Translation Adjustments
 
(0.1
)
 
(0.3
)
 
(0.3
)
 
(0.3
)
Net Unrecognized Postretirement Benefit Costs
 
(0.1
)
 
0.1

 
(0.1
)
 
0.1

Gain and Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment
 
—

 
2.7

 
0.1

 
2.0

Reclassification Adjustment for Amounts Included in Net Income
 
—

 
(0.4
)
 
0.1

 
(0.4
)
Gain and Loss on Cash Flow Hedges
 
—

 
2.3

 
0.2

 
1.6

Other Comprehensive Income Tax Benefit (Expense)
 
$
38.1

 
$
(21.6
)
 
$
12.7

 
$
(12.2
)
Schedule of Accumulated Other Comprehensive Income [Table Text Block]
The components of AOCI at June 30, 2018 and December 31, 2017 were:
(Dollars in Millions)
 
Jun 30,
2018
 
Dec 31,
2017
Net Unrealized Gains on Investments, Net of Income Taxes:
 
 
 
 
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings
 
$
—

 
$
0.2

Other Net Unrealized Gains on Investments
 
161.7

 
269.5

Foreign Currency Translation Adjustments, Net of Income Taxes
 
0.4

 
0.2

Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes
 
(88.7
)
 
(72.2
)
Loss on Cash Flow Hedges, Net of Income Taxes
 
(3.8
)
 
(3.3
)
Accumulated Other Comprehensive Income
 
$
69.6

 
$
194.4
Reclassification out of Accumulated Comprehensive Income [Table Text Block]
The components of AOCI at June 30, 2018 and December 31, 2017 were:
(Dollars in Millions)
 
Jun 30,
2018
 
Dec 31,
2017
Net Unrealized Gains on Investments, Net of Income Taxes:
 
 
 
 
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings
 
$
—

 
$
0.2

Other Net Unrealized Gains on Investments
 
161.7

 
269.5

Foreign Currency Translation Adjustments, Net of Income Taxes
 
0.4

 
0.2

Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes
 
(88.7
)
 
(72.2
)
Loss on Cash Flow Hedges, Net of Income Taxes
 
(3.8
)
 
(3.3
)
Accumulated Other Comprehensive Income
 
$
69.6

 
$
194.4


Note 6 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (continued)
Components of AOCI were reclassified to the following lines of the Condensed Consolidated Sta