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Postretirement Benefits Other Than Pensions (Tables) - Other Postretirement Benefit Plan, Defined Benefit [Member] | 12 Months Ended
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Dec. 31, 2017
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 Accumulated Postretirement Benefit Obligation for the years ended December 31, 2017 and 2016 were:
DOLLARS IN MILLIONS |  |
2017 |  | 2016
Fair Value of Plan Assets at Beginning of Year |  | $ | — |  |  | $ | — |
Employer Contributions |  | 0.9 |  |  | 3.4 |
Plan Participants’ Contributions |  | 0.5 |  |  | 1.0 |
Benefits Paid |  | (1.4 | ) |  | (4.4 | )
Fair Value of Plan Assets at End of Year |  | — |  |  | — |
Accumulated Postretirement Benefit Obligation at Beginning of Year |  | 15.1 |  |  | 29.6 |
Service Cost |  | 0.1 |  |  | 0.1 |
Interest Cost |  | 0.4 |  |  | 0.8 |
Plan Participants’ Contributions |  | 0.5 |  |  | 1.0 |
Benefits Paid |  | (1.4 | ) |  | (4.4 | )
Medicare Part D Subsidy Received |  | 0.2 |  |  | 0.3 |
Plan Amendments |  | — |  |  | (11.0 | )
Actuarial Gain |  | (0.5 | ) |  | (1.3 | )
Accumulated Postretirement Benefit Obligation at End of Year |  | 14.4 |  |  | 15.1 |
Funded Status—Accumulated Postretirement Benefit Obligation in Excess of Plan Assets |  | $ | (14.4 | ) |  | $ | (15.1 | )
Unamortized Actuarial Gain Reported in AOCI at End of Year |  | $ | 25.0 |  |  | $ | 27.6 |
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, 2017 and 2016 were:
|  | 2017 |  | 2016
Discount Rate |  | 3.36 | % |  | 3.60 | %
Rate of Increase in Future Compensation Levels |  | 2.20 |  |  | 2.60 |
The weighted-average discount rate and rate of increase in future compensation levels used to develop OPEB Expense for the years ended December 31, 2017, 2016 and 2015 were:
|  | 2017 |  | 2016 |  | 2015
Weighted-average Discount Rate |  | 3.61 | % |  | 3.70 | % |  | 3.40 | %
Service Cost Discount Rate |  | 3.79 |  |  | 4.21 |  |  | — |
Interest Cost Discount Rate |  | 2.92 |  |  | 2.90 |  |  | — |
Rate of Increase in Future Compensation Levels |  | 2.60 |  |  | 2.64 |  |  | 2.68 |
Schedule of Comprehensive Other Postretirement Employee Benefit Expense | The components of Comprehensive OPEB Expense (Income) for the years ended December 31, 2017, 2016 and 2015 were:
DOLLARS IN MILLIONS |  | 2017 |  | 2016 |  | 2015
Service Cost Earned During the Year |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.2 |
Interest Cost on Accumulated Postretirement Benefit Obligation |  | 0.4 |  |  | 0.8 |  |  | 1.0 |
Amortization of Actuarial Gain |  | (1.8 | ) |  | (1.4 | ) |  | (1.4 | )
OPEB Income Recognized in Consolidated Statements of Income |  | (1.3 | ) |  | (0.5 | ) |  | (0.2 | )
Unrecognized OPEB Loss (Gain) Arising During the Year |  | (0.5 | ) |  | (1.3 | ) |  | 0.4 |
Prior Service Credit Arising During the Year |  | (1.3 | ) |  | (11.0 | ) |  | — |
Amortization of Accumulated Unrecognized OPEB Gain |  | 1.8 |  |  | 1.4 |  |  | 1.4 |
Comprehensive OPEB Expense (Income) |  | $ | (1.3 | ) |  | $ | (11.4 | ) |  | $ | 1.6 |
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,
2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023-2027
Estimated Benefit Payments: |  |  |  |  |  |  |  |  |  |  |  |
Excluding Medicare Part D Subsidy |  | $ | 1.6 |  |  | $ | 1.6 |  |  | $ | 1.5 |  |  | $ | 1.5 |  |  | $ | 1.4 |  |  | $ | 5.7 |
Expected Medicare Part D Subsidy |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net Estimated Benefit Payments |  | $ | 1.6 |  |  | $ | 1.6 |  |  | $ | 1.5 |  |  | $ | 1.5 |  |  | $ | 1.4 |  |  | $ | 5.7 |

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