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Other Comprehensive Income and Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]  
Schedule of Comprehensive Income [Table Text Block]
The components of Other Comprehensive Income Before Income Taxes for the six and three months ended June 30, 2017 and 2016 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2017
 
Jun 30,
2016
 
Jun 30,
2017
 
Jun 30,
2016
Other Comprehensive Income (Loss) Before Income Taxes:
 
 
 
 
 
 
 
 
Unrealized Holding Gains Arising During the Period Before Reclassification Adjustment
 
$
91.3

 
$
221.3

 
$
57.7

 
$
123.1

Reclassification Adjustment for Amounts Included in Net Income
 
(24.1
)
 
4.2

 
(19.0
)
 
1.7

Unrealized Holding Gains
 
67.2

 
225.5

 
38.7

 
124.8

Foreign Currency Translation Adjustments
 
0.8

 
—

 
0.7

 
(0.1
)
Net Unrecognized Postretirement Benefit Costs Arising During the Period
 
—

 
(19.5
)
 
—

 
(18.7
)
Reclassification Adjustments for Amounts Included in Net Income:
 
 
 
 
 
 
 
 
Curtailment Cost Recognized
 
—

 
1.0

 
—

 
1.0

Amortization of Net Unrecognized Postretirement Benefit Costs
 
(0.3
)
 
4.3

 
(0.2
)
 
1.7

Total Reclassification Adjustments for Amounts Included in Net Income
 
(0.3
)
 
5.3

 
(0.2
)
 
2.7

Net Unrecognized Postretirement Benefit Costs
 
(0.3
)
 
(14.2
)
 
(0.2
)
 
(16.0
)
Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment
 
(7.6
)
 
—

 
(5.6
)
 
—

Reclassification Adjustment for Amounts Included in Net Income
 
1.1

 
—

 
1.1

 
—

Loss on Cash Flow Hedges
 
(6.5
)
 
—

 
(4.5
)
 
—

Other Comprehensive Income Before Income Taxes
 
$
61.2

 
$
211.3

 
$
34.7

 
$
108.7

The components of Other Comprehensive Income Tax Benefit (Expense) for the six and three months ended June 30, 2017 and 2016 were:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2017
 
Jun 30,
2016
 
Jun 30,
2017
 
Jun 30,
2016
Other Comprehensive Income Tax Benefit (Expense):
 
 
 
 
 
 
 
 
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment
 
$
(32.1
)
 
$
(78.0
)
 
$
(20.2
)
 
$
(43.4
)
Reclassification Adjustment for Amounts Included in Net Income
 
8.4

 
(1.5
)
 
6.6

 
(0.6
)
Unrealized Holding Gains
 
(23.7
)
 
(79.5
)
 
(13.6
)
 
(44.0
)
Foreign Currency Translation Adjustments
 
(0.3
)
 
—

 
(0.3
)
 
—

Net Unrecognized Postretirement Benefit Costs Arising During the Period
 
—

 
6.9

 
—

 
6.6

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

 
(0.4
)
 
—

 
(0.4
)
Amortization of Net Unrecognized Postretirement Benefit Costs
 
0.1

 
(1.5
)
 
0.1

 
(0.5
)
Total Reclassification Adjustments for Amounts Included in Net Income
 
0.1

 
(1.9
)
 
0.1

 
(0.9
)
Net Unrecognized Postretirement Benefit Costs
 
0.1

 
5.0

 
0.1

 
5.7

Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment
 
2.7

 
—

 
2.0

 
—

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

 
(0.4
)
 
—

Loss on Cash Flow Hedges
 
2.3

 
—

 
1.6

 
—

Other Comprehensive Income Tax Expense
 
$
(21.6
)
 
$
(74.5
)
 
$
(12.2
)
 
$
(38.3
)
Schedule of Accumulated Other Comprehensive Income [Table Text Block]
The components of AOCI at June 30, 2017 and December 31, 2016 were:
(Dollars in Millions)
 
Jun 30,
2017
 
Dec 31,
2016
Net Unrealized Gains on Investments, Net of Income Taxes:
 
 
 
 
Available for Sale Fixed Maturities with Portion of OTTI Recognized in Earnings
 
$
(0.1
)
 
$
0.1

Other Net Unrealized Gains on Investments
 
255.4

 
211.7

Foreign Currency Translation Adjustments, Net of Income Taxes
 
(0.4
)
 
(0.9
)
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes
 
(75.1
)
 
(74.9
)
Gain (Loss) on Cash Flow Hedges, Net of Income Taxes
 
(3.2
)
 
1.0

Accumulated Other Comprehensive Income
 
$
176.6

 
$
137.0
Reclassification out of Accumulated Comprehensive Income [Table Text Block]
Components of AOCI were reclassified to the following lines of the Condensed Consolidated Statements of Income for the six and three months ended June 30, 2017 and 2016:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2017
 
Jun 30,
2016
 
Jun 30,
2017
 
Jun 30,
2016
Reclassification of AOCI from Net Unrealized Gains on Investments to:
 
 
 
 
 
 
 
 
Net Realized Gains on Sales of Investments
 
$
31.7

 
$
11.5

 
$
21.6

 
$
4.7

Net Impairment Losses Recognized in Earnings
 
(7.6
)
 
(15.7
)
 
(2.6
)
 
(6.4
)
Total Before Income Taxes
 
24.1

 
(4.2
)
 
19.0

 
(1.7
)
Income Tax Benefit (Expense)
 
(8.4
)
 
1.5

 
(6.6
)
 
0.6

Reclassification from AOCI, Net of Income Taxes
 
15.7

 
(2.7
)
 
12.4

 
(1.1
)
Reclassification of AOCI from Unrecognized Postretirement Benefit Costs to:
 
 
 
 
 
 
 
 
Interest and Other Expenses
 
0.3

 
(5.3
)
 
0.2

 
(2.7
)
Income Tax Benefit (Expense)
 
(0.1
)
 
1.9

 
(0.1
)
 
0.9

Reclassification from AOCI, Net of Income Taxes
 
0.2

 
(3.4
)
 
0.1

 
(1.8
)
Reclassification of AOCI from Loss on Cash Flow Hedges to:
 
 
 
 
 
 
 
 
Interest and Other Expenses
 
(1.1
)
 
—

 
(1.1
)
 
—

Income Tax Benefit
 
0.4

 
—

 
0.4

 
—

Reclassification from AOCI, Net of Income Taxes
 
(0.7
)
 
—

 
(0.7
)
 
—

Total Reclassification from AOCI to Net Income
 
$
15.2

 
$
(6.1
)
 
$
11.8

 
$
(2.9
)