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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, 2014
Other Postretirement Benefit Plan, Defined Benefit [Member] |
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, 2014 and 2013 were:
DOLLARS IN MILLIONS |  |
2014 |  | 2013
Fair Value of Plan Assets at Beginning of Year |  | $ | — |  |  | $ | — |
Employer Contributions |  | 3.4 |  |  | 2.9 |
Plan Participants’ Contributions |  | 1.2 |  |  | 1.2 |
Benefits Paid |  | (4.6 | ) |  | (4.1 | )
Fair Value of Plan Assets at End of Year |  | — |  |  | — |
Accumulated Postretirement Benefit Obligation at Beginning of Year |  | 35.1 |  |  | 42.8 |
Service Cost |  | 0.2 |  |  | 0.2 |
Interest Cost |  | 1.1 |  |  | 1.2 |
Plan Participants’ Contributions |  | 1.2 |  |  | 1.2 |
Benefits Paid |  | (4.6 | ) |  | (4.1 | )
Medicare Part D Subsidy Received |  | 0.1 |  |  | — |
Actuarial Gains |  | (2.0 | ) |  | (6.2 | )
Accumulated Postretirement Benefit Obligation at End of Year |  | 31.1 |  |  | 35.1 |
Funded Status—Accumulated Postretirement Benefit Obligation in Excess of Plan Assets |  | $ | (31.1 | ) |  | $ | (35.1 | )
Unamortized Actuarial Gain Reported in AOCI at End of Year |  | $ | 18.6 |  |  | $ | 18.4 |
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, 2014 and 2013 were:
|  | 2014 |  | 2013
Discount Rate |  | 3.40 | % |  | 4.00 | %
Rate of Increase in Future Compensation Levels |  | 2.68 |  |  | 2.10 |
The weighted-average discount rate and rate of increase in future compensation levels used to develop OPEB Expense for the years ended December 31, 2014, 2013 and 2012 were:
|  | 2014 |  | 2013 |  | 2012
Discount Rate |  | 4.00 | % |  | 3.15 | % |  | 4.25 | %
Rate of Increase in Future Compensation Levels |  | 2.10 |  |  | 2.10 |  |  | 2.10 |
Schedule of Comprehensive Other Postretirement Employee Benefit Expense | The components of Comprehensive OPEB Income for the years ended December 31, 2014, 2013 and 2012 were:
DOLLARS IN MILLIONS |  | 2014 |  | 2013 |  | 2012
Service Cost Earned During the Year |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.2 |
Interest Cost on Accumulated Postretirement Benefit Obligation |  | 1.1 |  |  | 1.2 |  |  | 1.6 |
Amortization of Actuarial Gain |  | (1.8 | ) |  | (1.2 | ) |  | (1.2 | )
OPEB Expense (Income) Recognized in Consolidated Statements of Income |  | (0.5 | ) |  | 0.2 |  |  | 0.6 |
Unrecognized OPEB Gain Arising During the Year |  | (2.0 | ) |  | (6.2 | ) |  | (5.5 | )
Amortization of Accumulated Unrecognized OPEB Gain |  | 1.8 |  |  | 1.2 |  |  | 1.2 |
Comprehensive OPEB Income |  | $ | (0.7 | ) |  | $ | (4.8 | ) |  | $ | (3.7 | )
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,
2015 |  | 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020-2024
Estimated Benefit Payments: |  |  |  |  |  |  |  |  |  |  |  |
Excluding Medicare Part D Subsidy |  | $ | 3.6 |  |  | $ | 3.7 |  |  | $ | 3.6 |  |  | $ | 3.5 |  |  | $ | 3.4 |  |  | $ | 13.8 |
Expected Medicare Part D Subsidy |  | (0.4 | ) |  | (0.4 | ) |  | (0.4 | ) |  | (0.4 | ) |  | (0.4 | ) |  | (1.6 | )
Net Estimated Benefit Payments |  | $ | 3.2 |  |  | $ | 3.3 |  |  | $ | 3.2 |  |  | $ | 3.1 |  |  | $ | 3.0 |  |  | $ | 12.2 |

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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