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Postretirement Benefits Other Than Pensions (Tables) - Other Postretirement Benefit Plan, 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 Plans’ Assets and Changes in Accumulated Postretirement Benefit Obligation for the years ended December 31, 2018 and 2017 were:
DOLLARS IN MILLIONS
 
 
2018
 
2017
Fair Value of Plans’ Assets at Beginning of Year
 
$
—

 
$
—

Employer Contributions
 
1.1

 
0.9

Plan Participants’ Contributions
 
0.3

 
0.5

Benefits Paid
 
(1.4
)
 
(1.4
)
Fair Value of Plan Assets at End of Year
 
—

 
—

Accumulated Postretirement Benefit Obligation at Beginning of Year
 
14.4

 
15.1

Obligation from Acquisition of Infinity
 
3.9

 
—

Service Cost
 
0.2

 
0.1

Interest Cost
 
0.4

 
0.4

Plan Participants’ Contributions
 
0.3

 
0.5

Benefits Paid
 
(1.4
)
 
(1.4
)
Medicare Part D Subsidy Received
 
0.2

 
0.2

Actuarial Gain
 
(3.0
)
 
(0.5
)
Accumulated Postretirement Benefit Obligation at End of Year
 
15.0

 
14.4

Funded Status—Accumulated Postretirement Benefit Obligation in Excess of Plans’ Assets
 
$
(15.0
)
 
$
(14.4
)
 
 
 
 
 
Unamortized Actuarial Gain Reported in AOCI at End of Year
 
$
24.9

 
$
25.0
Schedule of Assumptions Used
The weighted-average discount rate and rate of increase in future compensation levels used to develop the components of the Accumulated Postretirement Benefit Obligation at December 31, 2018 and 2017 were:
 
 
2018
 
2017
Discount Rate
 
4.02
%
 
3.36
%
Rate of Increase in Future Compensation Levels
 
2.20

 
2.20

The weighted-average discount rate and rate of increase in future compensation levels used to develop OPEB Expense for the years ended December 31, 2018, 2017 and 2016 were:
 
 
2018
 
2017
 
2016
Weighted-average Discount Rate
 
3.36
%
 
3.61
%
 
3.70
%
Service Cost Discount Rate
 
3.52

 
3.79

 
4.21

Interest Cost Discount Rate
 
2.96

 
2.92

 
2.90

Rate of Increase in Future Compensation Levels
 
2.20

 
2.60

 
2.64
Schedule of Comprehensive Other Postretirement Employee Benefit Expense
The components of Comprehensive OPEB Expense (Income) for the years ended December 31, 2018, 2017 and 2016 were:
DOLLARS IN MILLIONS
 
2018
 
2017
 
2016
Service Cost Earned During the Year
 
$
0.2

 
$
0.1

 
$
0.1

Interest Cost on Accumulated Postretirement Benefit Obligation
 
0.4

 
0.4

 
0.8

Amortization of Prior Service Credit
 
(1.3
)
 
—

 
—

Amortization of Accumulated Unrecognized OPEB Gain
 
(1.8
)
 
(1.8
)
 
(1.4
)
OPEB Income Recognized in Consolidated Statements of Income
 
(2.5
)
 
(1.3
)
 
(0.5
)
Unrecognized OPEB Loss (Gain) Arising During the Year
 
(3.0
)
 
(0.5
)
 
(1.3
)
Prior Service Credit Arising During the Year from Plan Amendments
 
—

 
(1.3
)
 
(11.0
)
Amortization of Prior Service Credit
 
1.3

 
—

 
—

Amortization of Accumulated Unrecognized OPEB Gain
 
1.8

 
1.8

 
1.4

Comprehensive OPEB Expense (Income)
 
$
(2.4
)
 
$
(1.3
)
 
$
(11.4
)
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:
DOLLARS IN MILLIONS
 
Years Ending December 31,
2019
 
2020
 
2021
 
2022
 
2023
 
2024-2028
Estimated Benefit Payments:
 
 
 
 
 
 
 
 
 
 
 
 
Excluding Medicare Part D Subsidy
 
$
1.7

 
$
1.6

 
$
1.5

 
$
1.6

 
$
1.5

 
$
6.2

Expected Medicare Part D Subsidy
 
—

 
—

 
—

 
—

 
—

 
—

Net Estimated Benefit Payments
 
$
1.7

 
$
1.6

 
$
1.5

 
$
1.6

 
$
1.5

 
$
6.2