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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 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 nine and three months ended September 30, 2018 and 2017 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2018
 
Sep 30,
2017
 
Sep 30,
2018
 
Sep 30,
2017
Other Comprehensive Income (Loss) Before Income Taxes:
 
 
 
 
 
 
 
 
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment
 
$
(224.4
)
 
$
110.5

 
$
(43.4
)
 
$
19.2

Reclassification Adjustment for Amounts Included in Net Income
 
(7.7
)
 
(27.7
)
 
(6.5
)
 
(3.6
)
Unrealized Holding Gains (Losses)
 
(232.1
)
 
82.8

 
(49.9
)
 
15.6

Foreign Currency Translation Adjustments
 
0.3

 
0.9

 
—

 
0.1

Net Unrecognized Postretirement Benefit Costs
 
0.8

 
(0.4
)
 
0.2

 
(0.1
)
Gain (Loss) on Cash Flow Hedges During the Period Before Reclassification Adjustment
 
0.8

 
(7.9
)
 
0.9

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

 
1.3

 
—

 
0.2

Gain (Loss) on Cash Flow Hedges
 
1.1

 
(6.6
)
 
0.9

 
(0.1
)
Other Comprehensive Income (Loss) Before Income Taxes
 
$
(229.9
)
 
$
76.7

 
$
(48.8
)
 
$
15.5

The components of Other Comprehensive Income Tax Benefit (Expense) for the nine and three months ended September 30, 2018 and 2017 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2018
 
Sep 30,
2017
 
Sep 30,
2018
 
Sep 30,
2017
Other Comprehensive Income Tax Benefit (Expense):
 
 
 
 
 
 
 
 
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment
 
$
47.2

 
$
(39.1
)
 
$
9.2

 
$
(7.0
)
Reclassification Adjustment for Amounts Included in Net Income
 
1.6

 
9.7

 
1.3

 
1.3

Unrealized Holding Gains
 
48.8

 
(29.4
)
 
10.5

 
(5.7
)
Foreign Currency Translation Adjustments
 
(0.1
)
 
(0.4
)
 
—

 
(0.1
)
Net Unrecognized Postretirement Benefit Costs
 
(0.1
)
 
0.2

 
—

 
0.1

Gain and Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment
 
(0.2
)
 
2.7

 
(0.2
)
 
—

Reclassification Adjustment for Amounts Included in Net Income
 
(0.1
)
 
(0.4
)
 
(0.1
)
 
—

Gain and Loss on Cash Flow Hedges
 
(0.3
)
 
2.3

 
(0.3
)
 
—

Other Comprehensive Income Tax Benefit (Expense)
 
$
48.3

 
$
(27.3
)
 
$
10.2

 
$
(5.7
)
Schedule of Accumulated Other Comprehensive Income [Table Text Block]
The components of AOCI at September 30, 2018 and December 31, 2017 were:
(Dollars in Millions)
 
Sep 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
 
122.6

 
269.5

Foreign Currency Translation Adjustments, Net of Income Taxes
 
—

 
0.2

Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes
 
(88.5
)
 
(72.2
)
Loss on Cash Flow Hedges, Net of Income Taxes
 
(3.2
)
 
(3.3
)
Accumulated Other Comprehensive Income
 
$
30.9

 
$
194.4
Reclassification out of Accumulated Comprehensive Income [Table Text Block]
The components of AOCI at September 30, 2018 and December 31, 2017 were:
(Dollars in Millions)
 
Sep 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
 
122.6

 
269.5

Foreign Currency Translation Adjustments, Net of Income Taxes
 
—

 
0.2

Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes
 
(88.5
)
 
(72.2
)
Loss on Cash Flow Hedges, Net of Income Taxes
 
(3.2
)
 
(3.3
)
Accumulated Other Comprehensive Income
 
$
30.9

 
$
194.4


Note 7 - Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (continued)
Components of AOCI were reclassified to the following lines of the Condensed Consolidated Sta