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Investments (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 by contractual maturity were:
(Dollars in Millions)
 
Amortized Cost
 
Fair Value
Due in One Year or Less
 
$
118.6

 
$
119.9

Due after One Year to Five Years
 
830.1

 
860.2

Due after Five Years to Ten Years
 
1,622.5

 
1,677.5

Due after Ten Years
 
2,077.4

 
2,286.2

Mortgage- and Asset-backed Securities Not Due at a Single Maturity Date
 
286.4

 
296.5

Investments in Fixed Maturities
 
$
4,935.0

 
$
5,240.3
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, 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
 
$
117.7

 
$
(7.2
)
 
$
1.1

 
$
—

 
$
118.8

 
$
(7.2
)
States and Political Subdivisions
 
432.7

 
(14.1
)
 
0.3

 
—

 
433.0

 
(14.1
)
Foreign Governments
 
2.1

 
(0.1
)
 
—

 
—

 
2.1

 
(0.1
)
Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
663.3

 
(16.6
)
 
107.3

 
(7.4
)
 
770.6

 
(24.0
)
Collateralized Loan Obligations
 
19.9

 
(0.7
)
 
21.4

 
(0.4
)
 
41.3

 
(1.1
)
Other Mortgage- and Asset-backed
 
—

 
—

 
—

 
—

 
—

 
—

Total Fixed Maturities
 
1,235.7

 
(38.7
)
 
130.1

 
(7.8
)
 
1,365.8

 
(46.5
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
15.6

 
(0.5
)
 
7.3

 
(0.3
)
 
22.9

 
(0.8
)
Other Industries
 
5.3

 
(0.5
)
 
—

 
—

 
5.3

 
(0.5
)
Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
2.8

 
—

 
—

 
—

 
2.8

 
—

Other Industries
 
0.6

 
(0.1
)
 
0.5

 
—

 
1.1

 
(0.1
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
—

 
—

 
18.6

 
(1.3
)
 
18.6

 
(1.3
)
Limited Liability Companies and Limited Partnerships
 
13.9

 
(0.7
)
 
33.8

 
(2.2
)
 
47.7

 
(2.9
)
Total Equity Securities
 
38.2

 
(1.8
)
 
60.2

 
(3.8
)
 
98.4

 
(5.6
)
Total
 
$
1,273.9

 
$
(40.5
)
 
$
190.3

 
$
(11.6
)
 
$
1,464.2

 
$
(52.1
)
An aging of unrealized losses on the Company’s Investments in Fixed Maturities and Equity Securities at March 31, 2017 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
 
$
125.5

 
$
(7.0
)
 
$
1.0

 
$
—

 
$
126.5

 
$
(7.0
)
States and Political Subdivisions
 
344.7

 
(9.6
)
 
0.4

 
—

 
345.1

 
(9.6
)
Foreign Governments
 
1.2

 
—

 
—

 
—

 
1.2

 
—

Corporate Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Bonds and Notes
 
571.5

 
(12.2
)
 
98.7

 
(6.2
)
 
670.2

 
(18.4
)
Collateralized Loan Obligations
 
5.3

 
—

 
5.0

 
—

 
10.3

 
—

Total Fixed Maturities
 
1,048.2

 
(28.8
)
 
105.1

 
(6.2
)
 
1,153.3

 
(35.0
)
Equity Securities:
 
 
 
 
 
 
 
 
 
 
 
 
Preferred Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
3.0

 
—

 
5.1

 
(0.1
)
 
8.1

 
(0.1
)
Other Industries
 
0.2

 
—

 
—

 
—

 
0.2

 
—

Common Stocks:
 
 
 
 
 
 
 
 
 
 
 
 
Other Industries
 
0.5

 
(0.2
)
 
0.5

 
—

 
1.0

 
(0.2
)
Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
36.4

 
(0.3
)
 
—

 
—

 
36.4

 
(0.3
)
Limited Liability Companies and Limited Partnerships
 
15.4

 
(1.7
)
 
12.6

 
(2.3
)
 
28.0

 
(4.0
)
Total Equity Securities
 
55.5

 
(2.2
)
 
18.2

 
(2.4
)
 
73.7

 
(4.6
)
Total
 
$
1,103.7

 
$
(31.0
)
 
$
123.3

 
$
(8.6
)
 
$
1,227.0

 
$
(39.6
)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
.
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2017
 
Mar 31,
2016
Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at Beginning of Period
 
$
1.4

 
$
5.1

Pre-tax Credit Losses on Fixed Maturities without Pre-tax Credit Losses Included in Cumulative Balance at Beginning of Period
 
0.4

 
2.7

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

 
(3.6
)
Reductions for Investments Sold During Period
 
(0.2
)
 
—

Cumulative Balance of Pre-tax Credit Losses Recognized in Retained Earnings at End of Period
 
$
1.6

 
$
4.2
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, 2017 and 2016 were:
 
 
Three Months Ended
(Dollars in Millions)
 
Mar 31,
2017
 
Mar 31,
2016
Fixed Maturities:
 
 
 
 
Gains on Sales
 
$
1.4

 
$
7.1

Losses on Sales
 
(0.2
)
 
(0.3
)
Equity Securities:
 
 
 
 
Gains on Sales
 
8.9

 
—
Schedule of Other Investments [Table Text Block]
The carrying values of the Company’s Other Investments at March 31, 2017 and December 31, 2016 were:
(Dollars in Millions)
 
Mar 31,
2017
 
Dec 31,
2016
Loans to Policyholders at Unpaid Principal
 
$
294.9

 
$
294.2

Real Estate at Depreciated Cost
 
136.9

 
140.2

Trading Securities at Fair Value
 
5.7

 
5.3

Other
 
0.2

 
0.2

Total
 
$
437.7

 
$
439.9
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, 2017 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
(Dollars in Millions)
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
347.3

 
$
22.2

 
$
(7.0
)
 
$
362.5

States and Political Subdivisions
 
1,657.9

 
95.0

 
(9.6
)
 
1,743.3

Foreign Governments
 
4.4

 
0.1

 
—

 
4.5

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,804.9

 
217.9

 
(18.4
)
 
3,004.4

Redeemable Preferred Stocks
 
0.1

 
0.1

 
—

 
0.2

Collateralized Loan Obligations
 
119.5

 
3.9

 
—

 
123.4

Other Mortgage- and Asset-backed
 
0.9

 
1.1

 
—

 
2.0

Investments in Fixed Maturities
 
$
4,935.0

 
$
340.3

 
$
(35.0
)
 
$
5,240.3

The amortized cost and estimated fair values of the Company’s Investments in Fixed Maturities at December 31, 2016 were:
 
 
Amortized
Cost
 
Gross Unrealized
 
Fair Value
(Dollars in Millions)
 
Gains
 
Losses
 
U.S. Government and Government Agencies and Authorities
 
$
321.2

 
$
22.3

 
$
(7.2
)
 
$
336.3

States and Political Subdivisions
 
1,640.6

 
88.4

 
(14.1
)
 
1,714.9

Foreign Governments
 
3.5

 
—

 
(0.1
)
 
3.4

Corporate Securities:
 
 
 
 
 
 
 
 
Bonds and Notes
 
2,758.9

 
209.9

 
(24.0
)
 
2,944.8

Redeemable Preferred Stocks
 
0.5

 
0.1

 
—

 
0.6

Collateralized Loan Obligations
 
121.2

 
2.7

 
(1.1
)
 
122.8

Other Mortgage- and Asset-backed
 
0.9

 
1.2

 
—

 
2.1

Investments in Fixed Maturities
 
$
4,846.8

 
$
324.6

 
$
(46.5
)
 
$
5,124.9
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, 2016 were:
 
 
 
 
Gross Unrealized
 
 
(Dollars in Millions)
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
58.1

 
$
2.3

 
$
(0.8
)
 
$
59.6

Other Industries
 
18.5

 
4.9

 
(0.5
)
 
22.9

Common Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
31.2

 
2.3

 
—

 
33.5

Other Industries
 
7.2

 
4.6

 
(0.1
)
 
11.7

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
136.1

 
9.6

 
(1.3
)
 
144.4

Limited Liability Companies and Limited Partnerships
 
183.3

 
29.2

 
(2.9
)
 
209.6

Investments in Equity Securities
 
$
434.4

 
$
52.9

 
$
(5.6
)
 
$
481.7

Gross unrealized gains and gross unrealized losses on the Company’s Investments in Equity Securities at March 31, 2017 were:
 
 
 
 
Gross Unrealized
 
 
(Dollars in Millions)
 
Cost
 
Gains
 
Losses
 
Fair Value
Preferred Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
$
53.6

 
$
3.8

 
$
(0.1
)
 
$
57.3

Other Industries
 
18.3

 
5.3

 
—

 
23.6

Common Stocks:
 
 
 
 
 
 
 
 
Finance, Insurance and Real Estate
 
10.2

 
0.5

 
—

 
10.7

Other Industries
 
6.2

 
5.1

 
(0.2
)
 
11.1

Other Equity Interests:
 
 
 
 
 
 
 
 
Exchange Traded Funds
 
177.1

 
15.5

 
(0.3
)
 
192.3

Limited Liability Companies and Limited Partnerships
 
183.3

 
23.1

 
(4.0
)
 
202.4

Investments in Equity Securities
 
$
448.7

 
$
53.3

 
$
(4.6
)
 
$
497.4