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Pension Benefits (Tables) - Pension Plans, Defined Benefit [Member]
 12 Months Ended
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Fair Value of Plan Assets
Changes in Fair Value of Plan Assets and Changes in Projected Benefit Obligation for the Pension Plan for the years ended December 31, 2015 and 2014 is presented below.
DOLLARS IN MILLIONS
 
 
2015
 
2014
Fair Value of Plan Assets at Beginning of Year
 
$
543.0

 
$
524.5

Actual Return on Plan Assets
 
(10.6
)
 
41.7

Benefits Paid
 
(24.9
)
 
(23.2
)
Fair Value of Plan Assets at End of Year
 
507.5

 
543.0

Projected Benefit Obligation at Beginning of Year
 
634.0

 
515.5

Service Cost
 
10.5

 
8.7

Interest Cost
 
25.7

 
24.8

Benefits Paid
 
(24.9
)
 
(23.2
)
Plan Amendments
 
—

 
(0.6
)
Actuarial Losses (Gains)
 
(47.5
)
 
108.8

Projected Benefit Obligation at End of Year
 
597.8

 
634.0

Funded Status—Plan Assets in Excess (Deficit) of Projected Benefit Obligation
 
$
(90.3
)
 
$
(91.0
)
Unamortized Amount Reported in AOCI at End of Year:
 
 
 
 
Accumulated Actuarial Loss
 
$
(152.2
)
 
$
(178.6
)
Prior Service Credit
 
0.4

 
0.5

Unamortized Amount Reported in AOCI at End of Year
 
$
(151.8
)
 
$
(178.1
)
Accumulated Benefit Obligation at End of Year
 
$
573.9

 
$
608.2
Schedule of Assumptions Used
The weighted-average discount rate and rate of increase in future compensation levels used to estimate the components of the Projected Benefit Obligation for the Pension Plan at December 31, 2015 and 2014 were:
 
 
2015
 
2014
Discount Rate
 
4.47
%
 
4.10
%
Rate of Increase in Future Compensation Levels
 
3.15

 
3.31

used to develop the components of Pension Expense for the Pension Plan for the years ended December 31, 2015, 2014 and 2013 were:
 
 
2015
 
2014
 
2013
Discount Rate
 
4.10
%
 
4.90
%
 
4.05
%
Rate of Increase in Future Compensation Levels
 
3.31

 
3.05

 
3.08

Expected Long Term Rate of Return on Plan Assets
 
6.75

 
7.00

 
7.00
Schedule of Allocation of Plan Assets
Weighted-average asset allocations for the Pension Plan at December 31, 2015 and 2014 by asset category were:
ASSET CATEGORY
 
2015
 
2014
Cash and Short-term Investments
 
4
%
 
4
%
Corporate Bonds and Notes
 
28

 
29

Common and Preferred Stocks
 
43

 
43

Exchange Traded Funds
 
9

 
12

Other Assets
 
16

 
12

Total
 
100
%
 
100
%
Fair Value, Measurement Inputs, Disclosure
Fair value measurements for the Pension Plan’s assets at December 31, 2014 are summarized below.
DOLLARS IN MILLIONS
 
Quoted Prices
in Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Fair Value
Fixed Maturities:
 
 
 
 
 
 
 
 
U.S. Government and Government Agencies and Authorities
 
$
18.4

 
$
—

 
$
—

 
$
18.4

States and Political Subdivisions
 
—

 
3.3

 
—

 
3.3

Corporate Bonds and Notes
 
—

 
136.6

 
—

 
136.6

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

 
6.4

 
—

 
6.4

Common Stocks:
 
 
 
 
 
 
 
 
Manufacturing
 
98.8

 
15.0

 
—

 
113.8

Other Industries
 
79.3

 
2.3

 
—

 
81.6

Other Equity Interests:
 
 
 
 
 
 
 
 
Collective Investment Funds
 
—

 
30.0

 
—

 
30.0

Exchange Traded Funds
 
65.5

 
—

 
—

 
65.5

Limited Liability Companies and Limited Partnerships
 
—

 
—

 
64.5

 
64.5

Short-term Investments
 
21.5

 
—

 
—

 
21.5

Receivables and Other
 
1.0

 
—

 
0.4

 
1.4

Total
 
$
284.5

 
$
193.6

 
$
64.9

 
$
543.0

Fair value measurements for the Pension Plan’s assets at December 31, 2015 are summarized below.
DOLLARS IN MILLIONS
 
Quoted Prices
in Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
Fair Value
Fixed Maturities:
 
 
 
 
 
 
 
 
U.S. Government and Government Agencies and Authorities
 
$
19.2

 
$
—

 
$
—

 
$
19.2

States and Political Subdivisions
 
—

 
3.2

 
—

 
3.2

Corporate Bonds and Notes
 
—

 
122.2

 
—

 
122.2

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

 
6.1

 
—

 
6.1

Common Stocks:
 
 
 
 
 
 
 
 
Manufacturing
 
77.9

 
16.2

 
—

 
94.1

Other Industries
 
82.5

 
1.8

 
—

 
84.3

Other Equity Interests:
 
 
 
 
 
 
 
 
Collective Investment Funds
 
—

 
31.1

 
—

 
31.1

Exchange Traded Funds
 
47.2

 
—

 
—

 
47.2

Limited Liability Companies and Limited Partnerships
 
—

 
—

 
78.2

 
78.2

Short-term Investments
 
20.4

 
—

 
—

 
20.4

Receivables and Other
 
1.1

 
—

 
0.4

 
1.5

Total
 
$
248.3

 
$
180.6

 
$
78.6

 
$
507.5
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)
The components of Comprehensive Pension Expense (Income) for the Pension Plan for the years ended December 31, 2015, 2014 and 2013 were:
DOLLARS IN MILLIONS
 
2015
 
2014
 
2013
Service Cost Earned During the Year
 
$
10.5

 
$
8.7

 
$
10.8

Interest Cost on Projected Benefit Obligation
 
25.7

 
24.8

 
22.4

Expected Return on Plan Assets
 
(35.0
)
 
(34.9
)
 
(29.7
)
Amortization of Actuarial Loss
 
24.4

 
9.7

 
26.2

Pension Expense Recognized in Consolidated Statements of Income
 
25.6

 
8.3

 
29.7

Unrecognized Pension Loss (Gain) Arising During the Year
 
(1.9
)
 
102.0

 
(53.8
)
Prior Service Credit Arising During the Year
 
—

 
(0.6
)
 
—

Amortization of Accumulated Unrecognized Pension Loss
 
(24.4
)
 
(9.7
)
 
(26.2
)
Comprehensive Pension Expense (Income)
 
$
(0.7
)
 
$
100.0

 
$
(50.3
)
Schedule of Expected Benefit Payments
The following benefit payments (net of participant contributions), which consider expected future service, as appropriate, are expected to be paid from the Pension Plan:
DOLLARS IN MILLIONS
 
Years Ending December 31,
2016
 
2017
 
2018
 
2019
 
2020
 
2021-2025
Estimated Pension Benefit Payments
 
$
26.3

 
$
27.7

 
$
29.1

 
$
30.3

 
$
31.5

 
$
174.4
Fair Value, Inputs, Level 3 [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Changes in Fair Value of Plan Assets
Additional information pertaining to the changes in the fair value of the Pension Plan’s assets classified as Level 3 for the year ended December 31, 2014 is presented below.
DOLLARS IN MILLIONS
 
Other Equity
Interests
 
Receivables
and Other
 
Total
Balance at Beginning of Year
 
$
46.9

 
$
0.5

 
$
47.4

Return on Plan Assets Held
 
3.4

 
—

 
3.4

Purchases, Sales and Settlements, Net
 
14.2

 
(0.1
)
 
14.1

Balance at End of Year
 
$
64.5

 
$
0.4

 
$
64.9

Additional information pertaining to the changes in the fair value of the Pension Plan’s assets classified as Level 3 for the year ended December 31, 2015 is presented below.
DOLLARS IN MILLIONS
 
Other Equity
Interests
 
Receivables
and Other
 
Total
Balance at Beginning of Year
 
$
64.5

 
$
0.4

 
$
64.9

Return on Plan Assets Held
 
(1.5
)
 
—

 
(1.5
)
Purchases, Sales and Settlements, Net
 
15.2

 
—

 
15.2

Balance at End of Year
 
$
78.2

 
$
0.4

 
$
78.6