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Pension Benefits (Tables) - Pension Plans, Defined Benefit [Member]
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015 is presented below.
DOLLARS IN MILLIONS
 
2016
 
2015
Fair Value of Plan Assets at Beginning of Year
 
$
507.5

 
$
543.0

Actual Return on Plan Assets
 
29.9

 
(10.6
)
Employer Contributions
 
9.0

 
—

Benefits Paid
 
(25.5
)
 
(24.9
)
Fair Value of Plan Assets at End of Year
 
520.9

 
507.5

Projected Benefit Obligation at Beginning of Year
 
597.8

 
634.0

Service Cost
 
4.8

 
10.5

Interest Cost
 
20.1

 
25.7

Benefits Paid
 
(25.5
)
 
(24.9
)
Curtailment
 
(23.3
)
 
—

Actuarial Losses (Gains)
 
19.7

 
(47.5
)
Projected Benefit Obligation at End of Year
 
593.6

 
597.8

Funded Status—Plan Assets in Deficit of Projected Benefit Obligation
 
$
(72.7
)
 
$
(90.3
)
Unamortized Amount Reported in AOCI at End of Year:
 
 
 
 
Accumulated Actuarial Loss
 
$
(144.7
)
 
$
(152.2
)
Prior Service Credit
 
—

 
0.4

Unamortized Amount Reported in AOCI at End of Year
 
$
(144.7
)
 
$
(151.8
)
Accumulated Benefit Obligation at End of Year
 
$
593.5

 
$
573.9
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, 2016 and 2015 were:
 
 
2016
 
2015
Discount Rate
 
4.18
%
 
4.47
%
Rate of Increase in Future Compensation Levels
 
2.56

 
3.15

used to develop the components of Pension Expense for the Pension Plan for the periods presented below were:
 
 
 
 
 
 
Years Ended December 31,
 
 
5/13/16 to 12/31/16
 
1/1/16 to 5/12/16
 
2015
 
2014
Weighted-average Discount Rate
 
3.94
%
 
4.47
%
 
4.10
%
 
4.90
%
Service Cost Discount Rate
 
4.22

 
4.78

 
—

 
—

Interest Cost Discount Rate
 
3.18

 
3.69

 
—

 
—

Rate of Increase in Future Compensation Levels
 
3.15

 
3.15

 
3.31

 
3.05

Expected Long Term Rate of Return on Plan Assets
 
6.25

 
6.25

 
6.75

 
7.00
Schedule of Allocation of Plan Assets
Weighted-average asset allocations for the Pension Plan at December 31, 2016 and 2015 by asset category were:
ASSET CATEGORY
 
2016
 
2015
Cash and Short-term Investments
 
2
%
 
4
%
Corporate Bonds and Notes
 
31

 
28

Common and Preferred Stocks
 
48

 
43

Exchange Traded Funds
 
1

 
9

Other Assets
 
18

 
16

Total
 
100
%
 
100
%
Fair Value, Measurement Inputs, Disclosure
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)
 
Measured at Net Asset Value
 
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

 
$
149.5

 
$
0.4

 
$
109.3

 
$
507.5

Fair value measurements for the Pension Plan’s assets at December 31, 2016 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)
 
Measured at Net Asset Value
 
Fair Value
Fixed Maturities:
 
 
 
 
 
 
 
 
 
 
U.S. Government and Government Agencies and Authorities
 
$
21.2

 
$
8.6

 
$
—

 
$
—

 
$
29.8

States and Political Subdivisions
 
—

 
3.1

 
—

 
—

 
3.1

Corporate Bonds and Notes
 
—

 
126.4

 
—

 
—

 
126.4

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

 
6.2

 
—

 
—

 
6.2

Common Stocks:
 
 
 
 
 
 
 
 
 
 
Manufacturing
 
77.5

 
16.0

 
—

 
—

 
93.5

Other Industries
 
88.1

 
—

 
—

 
—

 
88.1

Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
Collective Investment Funds
 
—

 
—

 
—

 
60.7

 
60.7

Exchange Traded Funds
 
6.0

 
—

 
—

 
—

 
6.0

Limited Liability Companies and Limited Partnerships
 
—

 
—

 
—

 
93.5

 
93.5

Short-term Investments
 
11.8

 
—

 
—

 
—

 
11.8

Receivables and Other
 
1.4

 
—

 
0.4

 
—

 
1.8

Total
 
$
206.0

 
$
160.3

 
$
0.4

 
$
154.2

 
$
520.9
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, 2016, 2015 and 2014 were:
DOLLARS IN MILLIONS
 
2016
 
2015
 
2014
Service Cost Earned During the Year
 
$
4.8

 
$
10.5

 
$
8.7

Interest Cost on Projected Benefit Obligation
 
20.1

 
25.7

 
24.8

Expected Return on Plan Assets
 
(32.7
)
 
(35.0
)
 
(34.9
)
Amortization of Actuarial Loss
 
6.6

 
24.4

 
9.7

Curtailment Gain
 
(0.3
)
 
—

 
—

Pension Expense (Income) Recognized in Consolidated Statements of Income
 
(1.5
)
 
25.6

 
8.3

Unrecognized Pension Loss (Gain) Arising During the Year
 
(0.7
)
 
(1.9
)
 
102.0

Prior Service Credit Arising During the Year
 
—

 
—

 
(0.6
)
Amortization of Accumulated Unrecognized Pension Loss
 
(6.3
)
 
(24.4
)
 
(9.7
)
Comprehensive Pension Expense (Income)
 
$
(8.5
)
 
$
(0.7
)
 
$
100.0
Schedule of Expected Benefit Payments
The following benefit payments (net of participant contributions), which consider expected future service of certain participants that remain eligible for a benefit accrual, as appropriate, are expected to be paid from the Pension Plan:
DOLLARS IN MILLIONS
 
Years Ending December 31,
2017
 
2018
 
2019
 
2020
 
2021
 
2022-2026
Estimated Pension Benefit Payments
 
$
27.6

 
$
28.8

 
$
29.9

 
$
30.9

 
$
31.9

 
$
170.0
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 in the two preceding tables for the years ended December 31, 2016 and 2015 is presented below.
DOLLARS IN MILLIONS
 
2016
 
2015
Balance at Beginning of Year
 
$
0.4

 
$
0.4

Return on Plan Assets Held
 
—

 
—

Purchases, Sales and Settlements, Net
 
—

 
—

Transfers out of Level 3
 
—

 
—

Balance at End of Year
 
$
0.4

 
$
0.4