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Investments (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 by contractual maturity were:
(Dollars in Millions)
 
Amortized Cost
 
Fair Value
Due in One Year or Less
 
$
66.4

 
$
67.7

Due after One Year to Five Years
 
921.0

 
960.3

Due after Five Years to Ten Years
 
1,530.1

 
1,641.1

Due after Ten Years
 
1,921.8

 
2,253.3

Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date
 
238.3

 
247.7

Investments in Fixed Maturities
 
$
4,677.6

 
$
5,170.1
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 September 30, 2016 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
 
$
43.0

 
$
(0.3
)
 
$
1.2

 
$
—

 
$
44.2

 
$
(0.3
)
States and Political Subdivisions
 
38.2

 
(0.3
)
 
0.3

 
—

 
38.5

 
(0.3
)
Foreign Governments
 
0.9

 
—

 
—

 
—

 
0.9

 
—

Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
189.8

 
(5.7
)
 
139.3

 
(7.5
)
 
329.1

 
(13.2
)
Collateralized Loan Obligations
 
23.0

 
(0.9
)
 
23.8

 
(0.7
)
 
46.8

 
(1.6
)
Other Mortgage- and Asset-backed
 
—

 
—

 
0.2

 
—

 
0.2

 
—

Total Fixed Maturities
 
294.9

 
(7.2
)
 
164.8

 
(8.2
)
 
459.7

 
(15.4
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
15.1

 
(0.6
)
 
7.5

 
(0.2
)
 
22.6

 
(0.8
)
Other Industries
 
8.3

 
(0.4
)
 
—

 
—

 
8.3

 
(0.4
)
Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Other Industries
 
0.5

 
—

 
0.5

 
—

 
1.0

 
—

Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
—

 
—

 
19.2

 
(0.8
)
 
19.2

 
(0.8
)
Limited Liability Companies and Limited Partnerships
 
46.7

 
(2.9
)
 
—

 
—

 
46.7

 
(2.9
)
Total Equity Securities
 
70.6

 
(3.9
)
 
27.2

 
(1.0
)
 
97.8

 
(4.9
)
Total
 
$
365.5

 
$
(11.1
)
 
$
192.0

 
$
(9.2
)
 
$
557.5

 
$
(20.3
)
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at December 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
 
$
56.6

 
$
(1.6
)
 
$
24.1

 
$
(2.0
)
 
$
80.7

 
$
(3.6
)
States and Political Subdivisions
 
131.0

 
(2.6
)
 
0.9

 
(0.1
)
 
131.9

 
(2.7
)
Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
783.8

 
(26.0
)
 
133.6

 
(14.7
)
 
917.4

 
(40.7
)
Collateralized Loan Obligations
 
57.4

 
(2.9
)
 
0.8

 
(0.1
)
 
58.2

 
(3.0
)
Other Mortgage- and Asset-backed
 
—

 
—

 
0.3

 
—

 
0.3

 
—

Total Fixed Maturities
 
1,028.8

 
(33.1
)
 
159.7

 
(16.9
)
 
1,188.5

 
(50.0
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
2.7

 
—

 
12.3

 
(0.8
)
 
15.0

 
(0.8
)
Other Industries
 
7.3

 
(0.8
)
 
—

 
—

 
7.3

 
(0.8
)
Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
16.3

 
(1.0
)
 
—

 
—

 
16.3

 
(1.0
)
Other Industries
 
2.8

 
(0.2
)
 
—

 
—

 
2.8

 
(0.2
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
135.2

 
(3.7
)
 
—

 
—

 
135.2

 
(3.7
)
Limited Liability Companies and Limited Partnerships
 
2.7

 
(0.5
)
 
—

 
—

 
2.7

 
(0.5
)
Total Equity Securities
 
167.0

 
(6.2
)
 
12.3

 
(0.8
)
 
179.3

 
(7.0
)
Total
 
$
1,195.8

 
$
(39.3
)
 
$
172.0

 
$
(17.7
)
 
$
1,367.8

 
$
(57.0
)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
.
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2016
 
Sep 30,
2015
 
Sep 30,
2016
 
Sep 30,
2015
Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at Beginning of Period
 
$
5.1

 
$
5.3

 
$
4.2

 
$
5.3

Pre-tax Credit Losses on Fixed Maturities without Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Period
 
2.7

 
—

 
—

 
—

Reductions for Change in Impairment Status:
 
 
 
 
 
 
 
 
From Status of Credit Loss to Status of Intent-to-sell or Required-to-sell
 
(6.3
)
 
—

 
(2.7
)
 
—

Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at End of Period
 
$
1.5

 
$
5.3

 
$
1.5

 
$
5.3
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, 2016 and 2015 were:
 
 
Nine Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Sep 30,
2016
 
Sep 30,
2015
 
Sep 30,
2016
 
Sep 30,
2015
Fixed Maturities:
 
 
 
 
 
 
 
 
Gains on Sales
 
$
14.1

 
$
9.5

 
$
2.7

 
$
3.6

Losses on Sales
 
(1.1
)
 
(0.7
)
 
(0.8
)
 
(0.1
)
Equity Securities:
 
 
 
 
 
 
 
 
Gains on Sales
 
9.8

 
35.7

 
9.3

 
2.8

Losses on Sales
 
(0.1
)
 
(1.4
)
 
—

 
(0.7
)
Schedule of Other Investments [Table Text Block]
The carrying values of the Company’s Other Investments at September 30, 2016 and December 31, 2015 were:
(Dollars in Millions)
 
Sep 30,
2016
 
Dec 31,
2015
Loans to Policyholders at Unpaid Principal
 
$
291.9

 
$
288.4

Real Estate at Depreciated Cost
 
141.5

 
149.8

Trading Securities at Fair Value
 
5.2

 
4.7

Other
 
0.2

 
0.3

Total
 
$
438.8

 
$
443.2
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, 2015 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
(Dollars in Millions)
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
298.0

 
$
26.2

 
$
(3.6
)
 
$
320.6

States and Political Subdivisions
 
1,513.7

 
111.6

 
(2.7
)
 
1,622.6

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,651.5

 
202.0

 
(40.7
)
 
2,812.8

Redeemable Preferred Stocks
 
3.7

 
0.1

 
—

 
3.8

Collateralized Loan Obligations
 
90.0

 
0.3

 
(3.0
)
 
87.3

Other Mortgage- and Asset-backed
 
3.8

 
1.4

 
—

 
5.2

Investments in Fixed Maturities
 
$
4,560.7

 
$
341.6

 
$
(50.0
)
 
$
4,852.3

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at September 30, 2016 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
(Dollars in Millions)
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
277.4

 
$
33.2

 
$
(0.3
)
 
$
310.3

States and Political Subdivisions
 
1,503.2

 
159.7

 
(0.3
)
 
1,662.6

Foreign Governments
 
3.5

 
0.1

 
—

 
3.6

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,770.7

 
311.8

 
(13.2
)
 
3,069.3

Redeemable Preferred Stocks
 
0.8

 
0.1

 
—

 
0.9

Collateralized Loan Obligations
 
121.1

 
1.9

 
(1.6
)
 
121.4

Other Mortgage- and Asset-backed
 
0.9

 
1.1

 
—

 
2.0

Investments in Fixed Maturities
 
$
4,677.6

 
$
507.9

 
$
(15.4
)
 
$
5,170.1
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, 2015 were:
 
 
 
 
Gross Unrealized
 
 
(Dollars in Millions)
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
80.8

 
$
4.9

 
$
(0.8
)
 
$
84.9

Other Industries
 
17.1

 
2.7

 
(0.8
)
 
19.0

Common Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
18.9

 
5.3

 
(1.0
)
 
23.2

Other Industries
 
9.4

 
4.3

 
(0.2
)
 
13.5

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
179.7

 
1.1

 
(3.7
)
 
177.1

Limited Liability Companies and Limited Partnerships
 
181.0

 
25.0

 
(0.5
)
 
205.5

Investments in Equity Securities
 
$
486.9

 
$
43.3

 
$
(7.0
)
 
$
523.2

Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at September 30, 2016 were:
 
 
 
 
Gross Unrealized
 
 
(Dollars in Millions)
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
79.1

 
$
4.7

 
$
(0.8
)
 
$
83.0

Other Industries
 
21.1

 
4.8

 
(0.4
)
 
25.5

Common Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
15.5

 
8.8

 
—

 
24.3

Other Industries
 
7.6

 
5.2

 
—

 
12.8

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
145.1

 
7.0

 
(0.8
)
 
151.3

Limited Liability Companies and Limited Partnerships
 
183.9

 
27.0

 
(2.9
)
 
208.0

Investments in Equity Securities
 
$
452.3

 
$
57.5

 
$
(4.9
)
 
$
504.9