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Investments (Tables)
 9 Months Ended
Sep. 30, 2014
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 September 30, 2014 by contractual maturity were:
(Dollars in Millions)
 
Amortized Cost
 
Fair Value
Due in One Year or Less
 
$
46.6

 
$
47.9

Due after One Year to Five Years
 
728.5

 
777.4

Due after Five Years to Ten Years
 
1,329.0

 
1,378.5

Due after Ten Years
 
2,009.5

 
2,277.1

Asset-backed Securities Not Due at a Single Maturity Date
 
204.9

 
216.3

Investments in Fixed Maturities
 
$
4,318.5

 
$
4,697.2
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 December 31, 2013 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
 
$
95.8

 
$
(10.9
)
 
$
4.4

 
$
(0.8
)
 
$
100.2

 
$
(11.7
)
States and Political Subdivisions
 
222.9

 
(20.1
)
 
2.0

 
(0.1
)
 
224.9

 
(20.2
)
Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
699.8

 
(39.4
)
 
103.2

 
(8.3
)
 
803.0

 
(47.7
)
Other Mortgage- and Asset-backed
 
13.9

 
(0.1
)
 
1.1

 
—

 
15.0

 
(0.1
)
Total Fixed Maturities
 
1,032.4

 
(70.5
)
 
110.7

 
(9.2
)
 
1,143.1

 
(79.7
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
22.5

 
(2.5
)
 
2.5

 
—

 
25.0

 
(2.5
)
Other Industries
 
4.3

 
(0.1
)
 
0.7

 
—

 
5.0

 
(0.1
)
Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Manufacturing
 
5.0

 
(0.1
)
 
0.2

 
—

 
5.2

 
(0.1
)
Other Industries
 
14.2

 
(0.9
)
 
0.5

 
—

 
14.7

 
(0.9
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
67.6

 
(1.0
)
 
—

 
—

 
67.6

 
(1.0
)
Limited Liability Companies and Limited Partnerships
 
53.1

 
(0.9
)
 
5.0

 
(0.7
)
 
58.1

 
(1.6
)
Total Equity Securities
 
166.7

 
(5.5
)
 
8.9

 
(0.7
)
 
175.6

 
(6.2
)
Total
 
$
1,199.1

 
$
(76.0
)
 
$
119.6

 
$
(9.9
)
 
$
1,318.7

 
$
(85.9
)
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at September 30, 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
 
$
24.3

 
$
(1.4
)
 
$
65.3

 
$
(4.0
)
 
$
89.6

 
$
(5.4
)
States and Political Subdivisions
 
50.1

 
(0.1
)
 
154.8

 
(4.2
)
 
204.9

 
(4.3
)
Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
250.8

 
(2.8
)
 
409.4

 
(15.6
)
 
660.2

 
(18.4
)
Collateralized Loan Obligations
 
36.2

 
(0.3
)
 
2.2

 
(0.1
)
 
38.4

 
(0.4
)
Other Mortgage- and Asset-backed
 
—

 
—

 
0.7

 
—

 
0.7

 
—

Total Fixed Maturities
 
361.4

 
(4.6
)
 
632.4

 
(23.9
)
 
993.8

 
(28.5
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
5.0

 
—

 
12.1

 
(1.0
)
 
17.1

 
(1.0
)
Other Industries
 
0.7

 
(0.1
)
 
0.7

 
—

 
1.4

 
(0.1
)
Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Manufacturing
 
30.8

 
(1.1
)
 
0.3

 
—

 
31.1

 
(1.1
)
Other Industries
 
12.0

 
(0.7
)
 
—

 
—

 
12.0

 
(0.7
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
51.2

 
(0.2
)
 
14.5

 
(0.4
)
 
65.7

 
(0.6
)
Limited Liability Companies and Limited Partnerships
 
74.8

 
(2.0
)
 
2.4

 
(0.3
)
 
77.2

 
(2.3
)
Total Equity Securities
 
174.5

 
(4.1
)
 
30.0

 
(1.7
)
 
204.5

 
(5.8
)
Total
 
$
535.9

 
$
(8.7
)
 
$
662.4

 
$
(25.6
)
 
$
1,198.3

 
$
(34.3
)
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.
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2014
 
Sep 30,
2013
 
Sep 30,
2014
 
Sep 30,
2013
Balance at Beginning of Period
 
$
9.9

 
$
4.6

 
$
12.9

 
$
4.4

Additions for Previously Unrecognized OTTI Credit Losses
 
2.4

 
1.8

 
—

 
0.8

Increases to Previously Recognized OTTI Credit Losses
 
0.6

 
1.3

 
—

 
1.3

Reductions for Change in Impairment Status:
 
 
 
 
 
 
 
 
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell
 
(2.4
)
 
(3.2
)
 
(2.4
)
 
(2.1
)
Reductions for Investments Sold During Period
 
—

 
(0.1
)
 
—

 
—

Balance at End of Period
 
$
10.5

 
$
4.4

 
$
10.5

 
$
4.4
Schedule of Realized Gain (Loss) [Table Text Block]
Gross gains and losses on sales of investments in fixed maturities and equity securities for the nine and three months ended September 30, 2014 and 2013 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2014
 
Sep 30,
2013
 
Sep 30,
2014
 
Sep 30,
2013
Fixed Maturities:
 
 
 
 
 
 
 
 
Gains on Sales
 
$
5.0

 
$
29.6

 
$
0.2

 
$
2.5

Equity Securities:
 
 
 
 
 
 
 
 
Gains on Sales
 
11.7

 
1.9

 
7.9

 
0.7

Losses on Sales
 
—

 
(0.3
)
 
—

 
(0.2
)
Schedule of Other Investments [Table Text Block]
The carrying values of the Company’s Other Investments at September 30, 2014 and December 31, 2013 were:
(Dollars in Millions)
 
Sep 30,
2014
 
Dec 31,
2013
Loans to Policyholders at Unpaid Principal
 
$
280.8

 
$
275.4

Real Estate at Depreciated Cost
 
164.3

 
167.1

Trading Securities at Fair Value
 
5.0

 
5.0

Other
 
0.4

 
0.5

Total
 
$
450.5

 
$
448.0
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 December 31, 2013 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
(Dollars in Millions)
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
351.1

 
$
22.8

 
$
(11.7
)
 
$
362.2

States and Political Subdivisions
 
1,327.4

 
53.8

 
(20.2
)
 
1,361.0

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,636.4

 
205.0

 
(47.7
)
 
2,793.7

Redeemable Preferred Stocks
 
6.6

 
0.8

 
—

 
7.4

Collateralized Loan Obligations
 
44.2

 
0.5

 
—

 
44.7

Other Mortgage- and Asset-backed
 
4.8

 
1.3

 
(0.1
)
 
6.0

Investments in Fixed Maturities
 
$
4,370.5

 
$
284.2

 
$
(79.7
)
 
$
4,575.0

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at September 30, 2014 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
(Dollars in Millions)
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
320.4

 
$
28.5

 
$
(5.4
)
 
$
343.5

States and Political Subdivisions
 
1,336.0

 
107.5

 
(4.3
)
 
1,439.2

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,589.4

 
268.0

 
(18.4
)
 
2,839.0

Redeemable Preferred Stocks
 
6.2

 
1.2

 
—

 
7.4

Collateralized Loan Obligations
 
62.5

 
0.4

 
(0.4
)
 
62.5

Other Mortgage- and Asset-backed
 
4.0

 
1.6

 
—

 
5.6

Investments in Fixed Maturities
 
$
4,318.5

 
$
407.2

 
$
(28.5
)
 
$
4,697.2
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 December 31, 2013 were:
 
 
 
 
Gross Unrealized
 
 
(Dollars in Millions)
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
85.4

 
$
2.9

 
$
(2.5
)
 
$
85.8

Other Industries
 
20.1

 
4.4

 
(0.1
)
 
24.4

Common Stocks:
 
 
 
 
 
 
 
 
Manufacturing
 
83.4

 
21.3

 
(0.1
)
 
104.6

Other Industries
 
68.8

 
17.0

 
(0.9
)
 
84.9

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
122.0

 
3.9

 
(1.0
)
 
124.9

Limited Liability Companies and Limited Partnerships
 
150.3

 
25.2

 
(1.6
)
 
173.9

Investments in Equity Securities
 
$
530.0

 
$
74.7

 
$
(6.2
)
 
$
598.5

Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at September 30, 2014 were:
 
 
 
 
Gross Unrealized
 
 
(Dollars in Millions)
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
85.5

 
$
4.9

 
$
(1.0
)
 
$
89.4

Other Industries
 
20.2

 
5.6

 
(0.1
)
 
25.7

Common Stocks:
 
 
 
 
 
 
 
 
Manufacturing
 
84.8

 
25.9

 
(1.1
)
 
109.6

Other Industries
 
67.3

 
22.6

 
(0.7
)
 
89.2

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
125.2

 
5.2

 
(0.6
)
 
129.8

Limited Liability Companies and Limited Partnerships
 
164.3

 
55.7

 
(2.3
)
 
217.7

Investments in Equity Securities
 
$
547.3

 
$
119.9

 
$
(5.8
)
 
$
661.4