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Investments (Tables)
 3 Months Ended
Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]  
Investments Classified by Contractual Maturity Date [Table Text Block]
The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at March 31, 2015 by contractual maturity were:
(Dollars in Millions)
 
Amortized Cost
 
Fair Value
Due in One Year or Less
 
$
44.1

 
$
44.9

Due after One Year to Five Years
 
741.1

 
795.5

Due after Five Years to Ten Years
 
1,338.5

 
1,414.5

Due after Ten Years
 
1,994.3

 
2,336.5

Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date
 
199.2

 
211.7

Investments in Fixed Maturities
 
$
4,317.2

 
$
4,803.1
Schedule of Unrealized Loss on Investments [Table Text Block]
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at March 31, 2015 is presented below.
 
 
Less Than 12 Months
 
12 Months or Longer
 
Total
(Dollars in Millions)
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Fixed Maturities:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and Government Agencies and Authorities
 
$
28.7

 
$
(0.2
)
 
$
25.5

 
$
(0.5
)
 
$
54.2

 
$
(0.7
)
States and Political Subdivisions
 
54.1

 
(0.4
)
 
1.0

 
—

 
55.1

 
(0.4
)
Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
221.1

 
(4.3
)
 
93.3

 
(2.7
)
 
314.4

 
(7.0
)
Redeemable Preferred Stocks
 
1.7

 
—

 
—

 
—

 
1.7

 
—

Collateralized Loan Obligations
 
20.4

 
(0.1
)
 
3.5

 
—

 
23.9

 
(0.1
)
Other Mortgage- and Asset-backed
 
—

 
—

 
0.4

 
—

 
0.4

 
—

Total Fixed Maturities
 
326.0

 
(5.0
)
 
123.7

 
(3.2
)
 
449.7

 
(8.2
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
7.2

 
(0.4
)
 
12.6

 
(0.4
)
 
19.8

 
(0.8
)
Other Industries
 
6.5

 
(0.7
)
 
0.5

 
—

 
7.0

 
(0.7
)
Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Other Industries
 
2.0

 
(0.6
)
 
—

 
—

 
2.0

 
(0.6
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
—

 
—

 
14.5

 
(0.6
)
 
14.5

 
(0.6
)
Limited Liability Companies and Limited Partnerships
 
94.3

 
(2.2
)
 
12.6

 
(0.6
)
 
106.9

 
(2.8
)
Total Equity Securities
 
110.0

 
(3.9
)
 
40.2

 
(1.6
)
 
150.2

 
(5.5
)
Total
 
$
436.0

 
$
(8.9
)
 
$
163.9

 
$
(4.8
)
 
$
599.9

 
$
(13.7
)
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at December 31, 2014 is presented below.
 
 
Less Than 12 Months
 
12 Months or Longer
 
Total
(Dollars in Millions)
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Fixed Maturities:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and Government Agencies and Authorities
 
$
24.9

 
$
(0.7
)
 
$
55.5

 
$
(1.3
)
 
$
80.4

 
$
(2.0
)
States and Political Subdivisions
 
1.0

 
—

 
126.3

 
(1.8
)
 
127.3

 
(1.8
)
Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
250.4

 
(5.1
)
 
360.5

 
(10.0
)
 
610.9

 
(15.1
)
Collateralized Loan Obligations
 
51.2

 
(0.7
)
 
3.4

 
(0.1
)
 
54.6

 
(0.8
)
Other Mortgage- and Asset-backed
 
—

 
—

 
0.4

 
—

 
0.4

 
—

Total Fixed Maturities
 
327.5

 
(6.5
)
 
546.1

 
(13.2
)
 
873.6

 
(19.7
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
7.5

 
(0.1
)
 
12.1

 
(0.9
)
 
19.6

 
(1.0
)
Other Industries
 
—

 
—

 
0.5

 
—

 
0.5

 
—

Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Manufacturing
 
15.1

 
(1.1
)
 
—

 
—

 
15.1

 
(1.1
)
Other Industries
 
4.2

 
(0.4
)
 
1.0

 
—

 
5.2

 
(0.4
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
14.9

 
(0.1
)
 
14.4

 
(0.6
)
 
29.3

 
(0.7
)
Limited Liability Companies and Limited Partnerships
 
54.4

 
(1.5
)
 
6.6

 
(0.3
)
 
61.0

 
(1.8
)
Total Equity Securities
 
96.1

 
(3.2
)
 
34.6

 
(1.8
)
 
130.7

 
(5.0
)
Total
 
$
423.6

 
$
(9.7
)
 
$
580.7

 
$
(15.0
)
 
$
1,004.3

 
$
(24.7
)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
The following table sets forth the pre-tax amount of other-than-temporary-impairment (“OTTI”) credit losses, recognized in Retained Earnings for Investments in Fixed Maturities held by the Company as of the dates indicated, for which the portion of the OTTI loss related to factors other than credit has been recognized in Accumulated Other Comprehensive Income, and the corresponding changes in such amounts.
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2015
 
Mar 31,
2014
Balance at Beginning of Period
 
$
5.3

 
$
9.9

Increases to Previously Recognized OTTI Credit Losses
 
—

 
0.3

Balance at End of Period
 
$
5.3

 
$
10.2
Schedule of Realized Gain (Loss) [Table Text Block]
Gross gains and losses on sales of investments in fixed maturities and equity securities for the three months ended March 31, 2015 and 2014 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2015
 
Mar 31,
2014
Fixed Maturities:
 
 
 
 
Gains on Sales
 
$
2.0

 
$
4.4

Losses on Sales
 
(0.1
)
 
—

Equity Securities:
 
 
 
 
Gains on Sales
 
1.5

 
0.8

Losses on Sales
 
—

 
—
Schedule of Other Investments [Table Text Block]
The carrying values of the Company’s Other Investments at March 31, 2015 and December 31, 2014 were:
(Dollars in Millions)
 
Mar 31,
2015
 
Dec 31,
2014
Loans to Policyholders at Unpaid Principal
 
$
284.5

 
$
283.4

Real Estate at Depreciated Cost
 
160.3

 
160.9

Trading Securities at Fair Value
 
4.9

 
4.9

Other
 
0.4

 
0.4

Total
 
$
450.1

 
$
449.6
Fixed Maturities [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at March 31, 2015 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
(Dollars in Millions)
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
307.0

 
$
34.0

 
$
(0.7
)
 
$
340.3

States and Political Subdivisions
 
1,355.9

 
134.7

 
(0.4
)
 
1,490.2

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,575.4

 
322.5

 
(7.0
)
 
2,890.9

Redeemable Preferred Stocks
 
5.9

 
0.5

 
—

 
6.4

Collateralized Loan Obligations
 
69.1

 
0.9

 
(0.1
)
 
69.9

Other Mortgage- and Asset-backed
 
3.9

 
1.5

 
—

 
5.4

Investments in Fixed Maturities
 
$
4,317.2

 
$
494.1

 
$
(8.2
)
 
$
4,803.1

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2014 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
(Dollars in Millions)
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
315.2

 
$
32.3

 
$
(2.0
)
 
$
345.5

States and Political Subdivisions
 
1,352.5

 
126.4

 
(1.8
)
 
1,477.1

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,599.3

 
294.3

 
(15.1
)
 
2,878.5

Redeemable Preferred Stocks
 
5.9

 
0.8

 
—

 
6.7

Collateralized Loan Obligations
 
64.9

 
0.3

 
(0.8
)
 
64.4

Other Mortgage- and Asset-backed
 
3.9

 
1.5

 
—

 
5.4

Investments in Fixed Maturities
 
$
4,341.7

 
$
455.6

 
$
(19.7
)
 
$
4,777.6
Equity Securities [Member]  
Schedule of Available-for-sale Securities [Line Items]  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at March 31, 2015 were:
 
 
 
 
Gross Unrealized
 
 
(Dollars in Millions)
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
85.5

 
$
5.8

 
$
(0.8
)
 
$
90.5

Other Industries
 
16.3

 
3.6

 
(0.7
)
 
19.2

Common Stocks:
 
 
 
 
 
 
 
 
Manufacturing
 
41.2

 
15.0

 
—

 
56.2

Other Industries
 
52.2

 
16.3

 
(0.6
)
 
67.9

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
195.3

 
10.4

 
(0.6
)
 
205.1

Limited Liability Companies and Limited Partnerships
 
165.0

 
27.5

 
(2.8
)
 
189.7

Investments in Equity Securities
 
$
555.5

 
$
78.6

 
$
(5.5
)
 
$
628.6

Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at December 31, 2014 were:
 
 
 
 
Gross Unrealized
 
 
(Dollars in Millions)
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
85.5

 
$
5.2

 
$
(1.0
)
 
$
89.7

Other Industries
 
16.3

 
3.5

 
—

 
19.8

Common Stocks:
 
 
 
 
 
 
 
 
Manufacturing
 
43.4

 
14.9

 
(1.1
)
 
57.2

Other Industries
 
60.8

 
16.2

 
(0.4
)
 
76.6

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
195.2

 
8.2

 
(0.7
)
 
202.7

Limited Liability Companies and Limited Partnerships
 
160.3

 
27.7

 
(1.8
)
 
186.2

Investments in Equity Securities
 
$
561.5

 
$
75.7

 
$
(5.0
)
 
$
632.2