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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]  
Schedule of Comprehensive Income [Table Text Block]
The components of Other Comprehensive Income Tax Benefit (Expense) for the nine and three months ended September 30, 2017 and 2016 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2017
 
Sep 30,
2016
 
Sep 30,
2017
 
Sep 30,
2016
Other Comprehensive Income Tax Benefit (Expense):
 
 
 
 
 
 
 
 
Unrealized Holding Gains and Losses Arising During the Period Before Reclassification Adjustment
 
$
(39.1
)
 
$
(76.0
)
 
$
(7.0
)
 
$
2.0

Reclassification Adjustment for Amounts Included in Net Income
 
9.7

 
(0.4
)
 
1.3

 
1.1

Unrealized Holding Gains
 
(29.4
)
 
(76.4
)
 
(5.7
)
 
3.1

Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment
 
(0.4
)
 
—

 
(0.1
)
 
—

Reclassification Adjustment for Amounts Included in Net Income
 
—

 
—

 
—

 
—

Foreign Currency Translation Adjustments
 
(0.4
)
 
—

 
(0.1
)
 
—

Net Unrecognized Postretirement Benefit Costs Arising During the Period
 
—

 
6.9

 
—

 
—

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

 
(0.4
)
 
—

 
—

Amortization of Net Unrecognized Postretirement Benefit Costs
 
0.2

 
(1.7
)
 
0.1

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

 
(2.1
)
 
0.1

 
(0.2
)
Net Unrecognized Postretirement Benefit Costs
 
0.2

 
4.8

 
0.1

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

 
—

 
—

 
—

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

 
—

 
—

Loss on Cash Flow Hedges
 
2.3

 
—

 
—

 
—

Other Comprehensive Income Tax Benefit (Expense)
 
$
(27.3
)
 
$
(71.6
)
 
$
(5.7
)
 
$
2.9

The components of Other Comprehensive Income (Loss) Before Income Taxes for the nine and three months ended September 30, 2017 and 2016 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2017
 
Sep 30,
2016
 
Sep 30,
2017
 
Sep 30,
2016
Other Comprehensive Income (Loss) Before Income Taxes:
 
 
 
 
 
 
 
 
Unrealized Holding Gains Arising During the Period Before Reclassification Adjustment
 
$
110.5

 
$
215.9

 
$
19.2

 
$
(5.4
)
Reclassification Adjustment for Amounts Included in Net Income
 
(27.7
)
 
1.3

 
(3.6
)
 
(2.9
)
Unrealized Holding Gains
 
82.8

 
217.2

 
15.6

 
(8.3
)
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment
 
0.9

 
—

 
0.1

 
—

Reclassification Adjustment for Amounts Included in Net Income
 
—

 
—

 
—

 
—

Foreign Currency Translation Adjustments
 
0.9

 
—

 
0.1

 
—

Net Unrecognized Postretirement Benefit Costs Arising During the Period
 
—

 
(19.5
)
 
—

 
—

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

 
1.0

 
—

 
—

Amortization of Net Unrecognized Postretirement Benefit Costs
 
(0.4
)
 
4.7

 
(0.1
)
 
0.4

Total Reclassification Adjustments for Amounts Included in Net Income
 
(0.4
)
 
5.7

 
(0.1
)
 
0.4

Net Unrecognized Postretirement Benefit Costs
 
(0.4
)
 
(13.8
)
 
(0.1
)
 
0.4

Loss on Cash Flow Hedges During the Period Before Reclassification Adjustment
 
(7.9
)
 
—

 
(0.3
)
 
—

Reclassification Adjustment for Amounts Included in Net Income
 
1.3

 
—

 
0.2

 
—

Loss on Cash Flow Hedges
 
(6.6
)
 
—

 
(0.1
)
 
—

Other Comprehensive Income (Loss) Before Income Taxes
 
$
76.7

 
$
203.4

 
$
15.5

 
$
(7.9
)
Schedule of Accumulated Other Comprehensive Income [Table Text Block]
The components of AOCI at September 30, 2017 and December 31, 2016 were:
(Dollars in Millions)
 
Sep 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
 
265.3

 
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
 
(3.3
)
 
1.0

Accumulated Other Comprehensive Income
 
$
186.4

 
$
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 Operations for the nine and three months ended September 30, 2017 and 2016:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2017
 
Sep 30,
2016
 
Sep 30,
2017
 
Sep 30,
2016
Reclassification of AOCI from Net Unrealized Gains on Investments to:
 
 
 
 
 
 
 
 
Net Realized Gains on Sales of Investments
 
$
38.2

 
$
22.7

 
$
6.5

 
$
11.2

Net Impairment Losses Recognized in Earnings
 
(10.5
)
 
(24.0
)
 
(2.9
)
 
(8.3
)
Total Before Income Taxes
 
27.7

 
(1.3
)
 
3.6

 
2.9

Income Tax Benefit (Expense)
 
(9.7
)
 
0.4

 
(1.3
)
 
(1.1
)
Reclassification from AOCI, Net of Income Taxes
 
18.0

 
(0.9
)
 
2.3

 
1.8

Reclassification of AOCI from Unrecognized Postretirement Benefit Costs to:
 
 
 
 
 
 
 
 
Interest and Other Expenses
 
0.4

 
(5.7
)
 
0.1

 
(0.4
)
Income Tax Benefit (Expense)
 
(0.2
)
 
2.1

 
(0.1
)
 
0.2

Reclassification from AOCI, Net of Income Taxes
 
0.2

 
(3.6
)
 
—

 
(0.2
)
Reclassification of AOCI from Loss on Cash Flow Hedges to:
 
 
 
 
 
 
 
 
Interest and Other Expenses
 
(1.3
)
 
—

 
(0.2
)
 
—

Income Tax Benefit
 
0.4

 
—

 
—

 
—

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

 
(0.2
)
 
—

Total Reclassification from AOCI to Net Income (Loss)
 
$
17.3

 
$
(4.5
)
 
$
2.1

 
$
1.6