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Postretirement Health Care and Life Insurance Benefits (Tables) - Postretirement Health Care and Life Insurance Benefits [Member] | 12 Months Ended
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Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Components of net periodic postretirement benefit cost | Net periodic postretirement benefit cost included the following components:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Service cost for benefits earned | $ | 10.4 |  |  | $ | 11.2 |  |  | $ | 12.2 |
Interest cost on accumulated postretirement benefit obligation | 34.5 |  |  | 33.8 |  |  | 36.4 |
Amortization of prior service (credit) cost | (9.2 | ) |  | (6.8 | ) |  | 1.3 |
Amortization of actuarial loss | 20.4 |  |  | 24.9 |  |  | 14.5 |
Special termination benefits (1) | — |  |  | — |  |  | 1.6 |
Net periodic postretirement benefit cost | $ | 56.1 |  |  | $ | 63.1 |  |  | $ | 66.0 |
(1) | Reflected in "Restructuring and pension settlement charges" in the consolidated statement of operations for the year ended December 31, 2014.
Amounts recognized in accumulated other comprehensive loss | The following includes pre-tax amounts recorded in "Accumulated other comprehensive loss":
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
| (Dollars in millions)
Net actuarial loss (gain) arising during year | $ | 32.3 |  |  | $ | (35.1 | ) |  | $ | 115.8 |
Prior service credit arising during year | — |  |  | — |  |  | (18.0 | )
Amortization: |  |  |  |  |  |  |  |
Actuarial loss | (20.4 | ) |  | (24.9 | ) |  | (14.5 | )
Prior service credit (cost) | 9.2 |  |  | 6.8 |  |  | (1.3 | )
Settlement related to the Patriot bankruptcy: (1) |  |  |  |  |
Prior service cost | 7.2 |  |  | (16.6 | ) |  | — |
Total recorded in "Accumulated other comprehensive loss" | $ | 28.3 |  |  | $ | (69.8 | ) |  | $ | 82.0 |
(1) | Refer to Note 27. "Matters Related to the Bankruptcy of Patriot Coal Corporation" herein for additional details related to this transaction.
Reconciled amount of plan's funded status | The following table sets forth the plans' funded status reconciled with the amounts shown in the consolidated balance sheets:
| December 31,
| 2016 |  | 2015
| (Dollars in millions)
Change in benefit obligation: |  |  |  |  |
Accumulated postretirement benefit obligation at beginning of period | $ | 776.1 |  |  | $ | 839.1 |
Service cost | 10.4 |  |  | 11.2 |
Interest cost | 34.5 |  |  | 33.8 |
Participant contributions | 0.6 |  |  | 1.7 |
Plan changes(1) | 7.2 |  |  | (16.6 | )
Benefits paid | (49.0 | ) |  | (46.5 | )
Actuarial loss (gain) | 32.3 |  |  | (35.1 | )
Settlement related to the Patriot bankruptcy (1) | — |  |  | (15.2 | )
Other | — |  |  | 3.7 |
Accumulated postretirement benefit obligation at end of period | 812.1 |  |  | 776.1 |
Change in plan assets: |  |  |  |  |
Fair value of plan assets at beginning of period | — |  |  | — |
Employer contributions | 48.4 |  |  | 44.8 |
Participant contributions | 0.6 |  |  | 1.7 |
Benefits paid and administrative fees (net of Medicare Part D reimbursements) | (49.0 | ) |  | (46.5 | )
Fair value of plan assets at end of period | — |  |  | — |
Funded status at end of year | (812.1 | ) |  | (776.1 | )
Less: Current portion (included in "Accounts payable and accrued expenses") | 55.8 |  |  | 53.2 |
Noncurrent obligation (included in "Accrued postretirement benefit costs") | $ | (756.3 | ) |  | $ | (722.9 | )
(1) | Refer to Note 27. "Matters Related to the Bankruptcy of Patriot Coal Corporation" herein for additional details related to the changes in the benefit obligation.
Weighted-average assumptions used to determine the benefit obligations | The weighted-average assumptions used to determine the benefit obligations as of the end of each year were as follows:
| December 31,
| 2016 |  | 2015
Discount rate | 4.15 | % |  | 4.50 | %
Measurement date | December 31, 2016 |  |  | December 31, 2015 |
The weighted-average assumptions used to determine net periodic benefit cost during each year were as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Discount rate | 4.50 | % |  | 4.10 | % |  | 4.90 | %
Measurement date | December 31, 2015 |  |  | December 31, 2014 |  |  | December 31, 2013 |
Assumed health care cost trend rate | The following presents information about the assumed health care cost trend rate:
| Year Ended December 31,
| 2016 |  | 2015
Pre-Medicare: |  |  |
Health care cost trend rate assumed for next year | 6.20 | % |  | 6.60 | %
Rate to which the cost trend is assumed to decline (the ultimate trend rate) | 4.75 | % |  | 4.75 | %
Year that the rate reaches the ultimate trend rate | 2021 |  |  | 2021 |
Post-Medicare: |  |  |
Health care cost trend rate assumed for next year | 5.60 | % |  | 5.80 | %
Rate to which the cost trend is assumed to decline (the ultimate trend rate) | 4.75 | % |  | 4.75 | %
Year that the rate reaches the ultimate trend rate | 2021 |  |  | 2021 |
Assumed health care cost trend rates, one percentage point increase | A one-percentage-point change in the assumed health care cost trend would have the following effects:
| One Percentage- Point Increase |  | One Percentage- Point Decrease
| (Dollars in millions)
Effect on total service and interest cost components (1) | $ | 3.6 |  |  | $ | (3.2 | )
Effect on total postretirement benefit obligation (1) | $ | 67.0 |  |  | $ | (61.9 | )
(1) | In addition to the effect on total service and interest cost components of expense, changes in trend rates would also increase or decrease the actuarial gain or loss amortization expense component. The impact on actuarial gain or loss amortization would approximate the increase or decrease in the obligation divided by 10.31 years at January 1, 2017.
Summary of estimated future benefit payments | The following benefit payments (net of retiree contributions), which reflect expected future service, as appropriate, are expected to be paid by the Company:
| Postretirement
| Benefits
| (Dollars in millions)
2017 | $ | 55.0 |
2018 | 56.2 |
2019 | 57.0 |
2020 | 57.5 |
2021 | 61.3 |
Years 2022-2026 | 290.3 |

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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=82843861&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=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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