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Investments (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]  
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, 2012 is presented below:
DOLLARS IN MILLIONS
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Fixed Maturities:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and Government Agencies and Authorities
 
$
40.8

 
$
(0.2
)
 
$
—

 
$
—

 
$
40.8

 
$
(0.2
)
States and Political Subdivisions
 
6.3

 
(0.1
)
 
0.3

 
—

 
6.6

 
(0.1
)
Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
268.5

 
(5.2
)
 
38.1

 
(2.3
)
 
306.6

 
(7.5
)
Redeemable Preferred Stocks
 
—

 
—

 
0.4

 
—

 
0.4

 
—

Mortgage and Asset-backed
 
—

 
—

 
1.7

 
(0.3
)
 
1.7

 
(0.3
)
Total Fixed Maturities
 
315.6

 
(5.5
)
 
40.5

 
(2.6
)
 
356.1

 
(8.1
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
—

 
—

 
2.4

 
(0.1
)
 
2.4

 
(0.1
)
Other Industries
 
2.3

 
(0.8
)
 
3.7

 
(0.1
)
 
6.0

 
(0.9
)
Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Manufacturing
 
6.3

 
(0.4
)
 
—

 
—

 
6.3

 
(0.4
)
Other Industries
 
14.2

 
(0.4
)
 
1.3

 
(0.1
)
 
15.5

 
(0.5
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Limited Liability Companies and Limited Partnerships
 
5.5

 
(0.5
)
 
6.7

 
(0.9
)
 
12.2

 
(1.4
)
Total Equity Securities
 
28.3

 
(2.1
)
 
14.1

 
(1.2
)
 
42.4

 
(3.3
)
Total
 
$
343.9

 
$
(7.6
)
 
$
54.6

 
$
(3.8
)
 
$
398.5

 
$
(11.4
)
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at December 31, 2011 is presented below:
DOLLARS IN MILLIONS
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Fixed Maturities:
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Government and Government Agencies and Authorities
 
$
1.3

 
$
—

 
$
—

 
$
—

 
$
1.3

 
$
—

States and Political Subdivisions
 
2.0

 
—

 
12.0

 
(0.8
)
 
14.0

 
(0.8
)
Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
169.6

 
(5.1
)
 
74.7

 
(4.3
)
 
244.3

 
(9.4
)
Redeemable Preferred Stocks
 
0.6

 
(0.1
)
 
0.1

 
—

 
0.7

 
(0.1
)
Mortgage and Asset-backed
 
—

 
—

 
2.7

 
(0.8
)
 
2.7

 
(0.8
)
Total Fixed Maturities
 
173.5

 
(5.2
)
 
89.5

 
(5.9
)
 
263.0

 
(11.1
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
54.9

 
(8.1
)
 
2.2

 
(0.6
)
 
57.1

 
(8.7
)
Other Industries
 
1.8

 
—

 
2.8

 
(0.1
)
 
4.6

 
(0.1
)
Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Manufacturing
 
1.5

 
(0.1
)
 
0.1

 
—

 
1.6

 
(0.1
)
Other Industries
 
10.7

 
(1.8
)
 
—

 
—

 
10.7

 
(1.8
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Limited Liability Companies and Limited Partnerships
 
17.1

 
(1.5
)
 
—

 
—

 
17.1

 
(1.5
)
Total Equity Securities
 
86.0

 
(11.5
)
 
5.1

 
(0.7
)
 
91.1

 
(12.2
)
Total
 
$
259.5

 
$
(16.7
)
 
$
94.6

 
$
(6.6
)
 
$
354.1

 
$
(23.3
)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
The following table sets forth the pre-tax amount of OTTI credit losses, recognized in Retained Earnings for Investments in Fixed Maturities held by the Company as of December 31, 2012, 2011 and 2010, for which a portion of the OTTI loss has been recognized in Accumulated Other Comprehensive Income, and the corresponding changes in such amounts.
DOLLARS IN MILLIONS
 
2012
 
2011
 
2010
Balance at Beginning of Year
 
$
3.9

 
$
2.4

 
$
3.7

Additions for Previously Unrecognized OTTI Credit Losses
 
1.1

 
2.2

 
5.3

Increases to Previously Recognized OTTI Credit Losses
 
—

 
—

 
0.4

Reductions to Previously Recognized OTTI Credit Losses
 
(0.1
)
 
(0.7
)
 
(1.7
)
Reductions due to Intent to Sell Investments
 
—

 
—

 
(5.1
)
Reductions for Investments Sold During Period
 
(0.3
)
 
—

 
(0.2
)
Balance at End of Year
 
$
4.6

 
$
3.9

 
$
2.4

The components of Net Impairment Losses Recognized in Earnings reported in the Consolidated Statements of Income for the years ended December 31, 2012, 2011 and 2010 were:
DOLLARS IN MILLIONS
 
2012
 
2011
 
2010
Fixed Maturities
 
$
(1.9
)
 
$
(2.2
)
 
$
(14.4
)
Equity Securities
 
(1.9
)
 
(1.9
)
 
(2.1
)
Real Estate
 
(3.1
)
 
(7.2
)
 
—

Net Impairment Losses Recognized in Earnings
 
$
(6.9
)
 
$
(11.3
)
 
$
(16.5
)
Schedule of Other Investments [Table Text Block]
The carrying values of the Company’s Other Investments at December 31, 2012 and 2011 were:
DOLLARS IN MILLIONS
 
2012
 
2011
Loans to Policyholders at Unpaid Principal
 
$
266.3

 
$
253.9

Real Estate at Depreciated Cost
 
226.2

 
239.4

Trading Securities
 
4.5

 
4.4

Other
 
0.5

 
0.6

Total
 
$
497.5

 
$
498.3
Investments in 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, 2012 were:
DOLLARS IN MILLIONS
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
384.0

 
$
45.1

 
$
(0.2
)
 
$
428.9

States and Political Subdivisions
 
1,251.0

 
150.5

 
(0.1
)
 
1,401.4

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,615.5

 
385.4

 
(7.5
)
 
2,993.4

Redeemable Preferred Stocks
 
30.1

 
2.5

 
—

 
32.6

Mortgage and Asset-backed
 
3.2

 
1.0

 
(0.3
)
 
3.9

Investments in Fixed Maturities
 
$
4,283.8

 
$
584.5

 
$
(8.1
)
 
$
4,860.2

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2011 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
DOLLARS IN MILLIONS
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
439.4

 
$
52.3

 
$
—

 
$
491.7

States and Political Subdivisions
 
1,705.0

 
148.4

 
(0.8
)
 
1,852.6

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,040.1

 
311.6

 
(9.4
)
 
2,342.3

Redeemable Preferred Stocks
 
76.7

 
5.1

 
(0.1
)
 
81.7

Mortgage and Asset-backed
 
4.9

 
1.0

 
(0.8
)
 
5.1

Investments in Fixed Maturities
 
$
4,266.1

 
$
518.4

 
$
(11.1
)
 
$
4,773.4
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 December 31, 2012 by contractual maturity were:
DOLLARS IN MILLIONS
 
Amortized Cost
 
Fair Value
Due in One Year or Less
 
$
64.0

 
$
65.8

Due after One Year to Five Years
 
606.0

 
639.0

Due after Five Years to Ten Years
 
1,139.2

 
1,251.8

Due after Ten Years
 
2,280.9

 
2,690.2

Asset-backed Securities Not Due at a Single Maturity Date
 
193.7

 
213.4

Investments in Fixed Maturities
 
$
4,283.8

 
$
4,860.2
Investments in 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, 2012 were:
DOLLARS IN MILLIONS
 
Cost
 
Gross Unrealized
 
Fair Value
Gains
 
Losses
 
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
75.4

 
$
3.9

 
$
(0.1
)
 
$
79.2

Other Industries
 
18.4

 
3.8

 
(0.9
)
 
21.3

Common Stocks:
 
 
 
 
 
 
 
 
Manufacturing
 
67.0

 
20.9

 
(0.4
)
 
87.5

Other Industries
 
59.1

 
8.1

 
(0.5
)
 
66.7

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
119.6

 
6.3

 
—

 
125.9

Limited Liability Companies and Limited Partnerships
 
123.2

 
19.5

 
(1.4
)
 
141.3

Investments in Equity Securities
 
$
462.7

 
$
62.5

 
$
(3.3
)
 
$
521.9

NOTE 4. INVESTMENTS (Continued)
Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at December 31, 2011 were:
DOLLARS IN MILLIONS
 
 
 
Gross Unrealized
 
 
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
94.4

 
$
1.0

 
$
(8.7
)
 
$
86.7

Other Industries
 
18.0

 
2.6

 
(0.1
)
 
20.5

Common Stocks:
 
 
 
 
 
 
 
 
Manufacturing
 
64.6

 
18.9

 
(0.1
)
 
83.4

Other Industries
 
41.4

 
7.4

 
(1.8
)
 
47.0

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
66.0

 
0.6

 
—

 
66.6

Limited Liability Companies and Limited Partnerships
 
82.9

 
11.7

 
(1.5
)
 
93.1

Investments in Equity Securities
 
$
367.3

 
$
42.2

 
$
(12.2
)
 
$
397.3