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Pension Benefits (Tables) - Pension Plans, Defined Benefit [Member]
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017 is presented below.
DOLLARS IN MILLIONS
 
2018
 
2017
Fair Value of Plan Assets at Beginning of Year
 
$
579.8

 
$
520.9

Actual Return on Plan Assets
 
(32.1
)
 
86.4

Employer Contributions
 
5.1

 
—

Benefits Paid
 
(27.5
)
 
(27.5
)
Fair Value of Plan Assets at End of Year
 
525.3

 
579.8

Projected Benefit Obligation at Beginning of Year
 
637.2

 
593.6

Interest Cost
 
20.3

 
20.6

Benefits Paid
 
(27.5
)
 
(27.5
)
Actuarial (Gains) Losses
 
(49.5
)
 
50.5

Projected Benefit Obligation at End of Year
 
580.5

 
637.2

Funded Status—Plan Assets in Deficit of Projected Benefit Obligation
 
$
(55.2
)
 
$
(57.4
)
Unamortized Amount Reported in AOCI at End of Year
 
$
(144.4
)
 
$
(137.2
)
Accumulated Benefit Obligation at End of Year
 
$
580.3

 
$
637.0
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, 2018 and 2017 were:
 
 
2018
 
2017
Discount Rate
 
4.28
%
 
3.63
%
Rate of Increase in Future Compensation Levels
 
3.40

 
3.40

used to develop the components of Pension Expense for the Pension Plan for the periods presented below were:
 
 
Year Ended
 
 
 
 
 
 
December 31, 2018
 
December 31, 2017
 
5/13/16 to 12/31/16
 
1/1/16 to 5/12/16
Weighted-average Discount Rate
 
3.63
%
 
4.19
%
 
3.94
%
 
4.47
%
Service Cost Discount Rate
 
3.61

 
4.15

 
4.22

 
4.78

Interest Cost Discount Rate
 
3.26

 
3.52

 
3.18

 
3.69

Rate of Increase in Future Compensation Levels
 
3.40

 
2.56

 
3.15

 
3.15

Expected Long Term Rate of Return on Plan Assets
 
5.35

 
5.80

 
6.25

 
6.25
Schedule of Allocation of Plan Assets
Weighted-average asset allocations for the Pension Plan at December 31, 2018 and 2017 by asset category were:
ASSET CATEGORY
 
2018
 
2017
Cash and Short-term Investments
 
1
%
 
2
%
Corporate Bonds and Notes
 
41

 
31

Common and Preferred Stocks
 
37

 
50

Exchange Traded Funds
 
6

 
1

Other Assets
 
15

 
16

Total
 
100
%
 
100
%
Fair Value, Measurement Inputs, Disclosure
Fair value measurements for the Pension Plan’s assets at December 31, 2017 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
 
$
56.7

 
$
—

 
$
—

 
—

 
$
56.7

States and Political Subdivisions
 
—

 
2.2

 
—

 
—

 
2.2

Corporate Bonds and Notes
 
—

 
122.0

 
—

 
—

 
122.0

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

 
4.9

 
—

 
—

 
4.9

Common Stocks:
 
 
 
 
 
 
 
 
 
 
Manufacturing
 
86.8

 
15.3

 
—

 
—

 
102.1

Other Industries
 
99.6

 
4.7

 
—

 
—

 
104.3

Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
Collective Investment Funds
 
—

 
—

 
—

 
79.2

 
79.2

Exchange Traded Funds
 
5.1

 
—

 
—

 
—

 
5.1

Limited Liability Companies and Limited Partnerships
 
—

 
—

 
—

 
95.9

 
95.9

Short-term Investments
 
9.0

 
—

 
—

 
—

 
9.0

Receivables and Other
 
(1.9
)
 
—

 
0.3

 
—

 
(1.6
)
Total
 
$
255.3

 
$
149.1

 
$
0.3

 
$
175.1

 
$
579.8

Fair value measurements for the Pension Plan’s assets at December 31, 2018 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
 
$
110.9

 
$
—

 
$
—

 
$
—

 
$
110.9

States and Political Subdivisions
 
—

 
2.1

 
—

 
—

 
2.1

Corporate Bonds and Notes
 
—

 
103.4

 
—

 
—

 
103.4

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

 
—

 
—

 
—

 
—

Common Stocks:
 
 
 
 
 
 
 
 
 
 
Manufacturing
 
—

 
—

 
—

 
—

 
—

Other Industries
 
106.0

 
17.4

 
—

 
—

 
123.4

Other Equity Interests:
 
 
 
 
 
 
 
 
 
 
Collective Investment Funds
 
—

 
—

 
—

 
68.6

 
68.6

Exchange Traded Funds
 
34.1

 
—

 
—

 
—

 
34.1

Limited Liability Companies and Limited Partnerships
 
—

 
—

 
—

 
77.1

 
77.1

Short-term Investments
 
4.4

 
—

 
—

 
—

 
4.4

Receivables and Other
 
1.0

 
—

 
0.3

 
—

 
1.3

Total
 
$
256.4

 
$
122.9

 
$
0.3

 
$
145.7

 
$
525.3
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, 2018, 2017 and 2016 were:
DOLLARS IN MILLIONS
 
2018
 
2017
 
2016
Service Cost Earned During the Year
 
$
—

 
$
—

 
$
4.8

Interest Cost on Projected Benefit Obligation
 
20.3

 
20.6

 
20.1

Expected Return on Plan Assets
 
(28.9
)
 
(30.9
)
 
(32.7
)
Amortization of Actuarial Loss
 
4.3

 
2.6

 
6.6

Curtailment Gain
 
—

 
—

 
(0.3
)
Pension Expense (Income) Recognized in Consolidated Statements of Income
 
(4.3
)
 
(7.7
)
 
(1.5
)
Unrecognized Pension Gain (Loss) Arising During the Year
 
11.5

 
(4.9
)
 
(0.7
)
Amortization of Accumulated Unrecognized Pension Loss
 
(4.3
)
 
(2.6
)
 
(6.3
)
Comprehensive Pension Expense (Income)
 
$
2.9

 
$
(15.2
)
 
$
(8.5
)
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,
2019
 
2020
 
2021
 
2022
 
2023
 
2024-2028
Estimated Pension Benefit Payments
 
$
30.4

 
$
30.7

 
$
31.9

 
$
32.9

 
$
33.7

 
$
175.7
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, 2018 and 2017 is presented below.
DOLLARS IN MILLIONS
 
2018
 
2017
Balance at Beginning of Year
 
$
0.3

 
$
0.4

Purchases, Sales and Settlements, Net
 
—

 
(0.1
)
Balance at End of Year
 
$
0.3

 
$
0.3