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Postretirement Health Care and Life Insurance Benefits (Tables) - Postretirement Health Care and Life Insurance Benefits | 12 Months Ended
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Dec. 31, 2018
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:
| Successor | Predecessor
| Year Ended December 31, 2018 |  | April 2 through December 31, 2017 | January 1 through April 1, 2017 |  | Year Ended December 31, 2016
| (Dollars in millions)
Service cost for benefits earned | $ | 8.2 |  |  | $ | 6.9 |  | $ | 2.3 |  |  | $ | 10.4 |
Interest cost on accumulated postretirement benefit obligation | 28.3 |  |  | 24.2 |  | 8.4 |  |  | 34.5 |
Amortization of prior service credit | — |  |  | — |  | (2.3 | ) |  | (9.2 | )
Amortization of actuarial loss | — |  |  | — |  | 5.5 |  |  | 20.4 |
Net actuarial gain | (128.4 | ) |  | (22.0 | ) | — |  |  | — |
Net periodic postretirement benefit cost | $ | (91.9 | ) |  | $ | 9.1 |  | $ | 13.9 |  |  | $ | 56.1 |
Amounts recognized in accumulated other comprehensive loss | The following includes pre-tax amounts recorded in “Accumulated other comprehensive income”:
| Successor | Predecessor
| Year Ended December 31, 2018 | January 1 through April 1, 2017 |  | Year Ended December 31, 2016
| (Dollars in millions)
Net actuarial loss arising during year | $ | — |  | $ | — |  |  | $ | 32.3 |
Prior service credit arising during year | (51.7 | ) | — |  |  | — |
Amortization: |  |  |  |  |  |
Actuarial loss | — |  | (5.5 | ) |  | (20.4 | )
Prior service credit | — |  | 2.3 |  |  | 9.2 |
Settlement related to the Patriot bankruptcy: |  |  |  |
Prior service credit | — |  | — |  |  | 7.2 |
Total recorded in “Accumulated other comprehensive income” | $ | (51.7 | ) | $ | (3.2 | ) |  | $ | 28.3 |
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:
| Successor | Predecessor
| Year Ended December 31, 2018 |  | April 2 through December 31, 2017 | January 1 through April 1, 2017
| (Dollars in millions)
Change in benefit obligation: |  |  |  |  |
Accumulated postretirement benefit obligation at beginning of period | $ | 783.3 |  |  | $ | 803.1 |  | $ | 812.1 |
Service cost | 8.2 |  |  | 6.9 |  | 2.3 |
Interest cost | 28.3 |  |  | 24.2 |  | 8.4 |
Participant contributions | 0.5 |  |  | 0.4 |  | 0.2 |
Plan amendments | (51.7 | ) |  | — |  | — |
Benefits paid | (44.8 | ) |  | (29.3 | ) | (12.8 | )
Actuarial gain | (128.4 | ) |  | (22.0 | ) | — |
Fresh start reporting adjustments | — |  |  | — |  | (7.1 | )
Accumulated postretirement benefit obligation at end of period | 595.4 |  |  | 783.3 |  | 803.1 |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets at beginning of period | — |  |  | — |  | — |
Employer contributions | 59.3 |  |  | 28.9 |  | 12.6 |
Participant contributions | 0.5 |  |  | 0.4 |  | 0.2 |
Benefits paid and administrative fees (net of Medicare Part D reimbursements) | (44.8 | ) |  | (29.3 | ) | (12.8 | )
Fair value of plan assets at end of period | 15.0 |  |  | — |  | — |
Funded status at end of period | (580.4 | ) |  | (783.3 | ) | (803.1 | )
Less: Current portion (included in “Accounts payable and accrued expenses”) | 32.7 |  |  | 53.3 |  | 56.1 |
Noncurrent obligation (included in “Accrued postretirement benefit costs”) | $ | (547.7 | ) |  | $ | (730.0 | ) | $ | (747.0 | )
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,
| 2018 |  | 2017
Discount rate | 4.35 | % |  | 3.70 | %
Measurement date | December 31, 2018 |  |  | December 31, 2017 |
The weighted-average assumptions used to determine net periodic benefit cost during each period were as follows:
| Successor | Predecessor
| Year Ended December 31, 2018 |  | April 2 through December 31, 2017 | January 1 through April 1, 2017 |  | Year Ended December 31, 2016
Discount rate | 3.70 | % |  | 4.10 | % | 4.15 | % |  | 4.50 | %
Measurement date | December 31, 2017 |  |  | April 1, 2017 |  | December 31, 2016 |  |  | December 31, 2015 |
Assumed health care cost trend rate | The following presents information about the assumed health care cost trend rate:
| Year Ended December 31,
| 2018 |  | 2017
Pre-Medicare: |  |  |
Health care cost trend rate assumed for next year | 6.55 | % |  | 7.00 | %
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 | 2023 |  |  | 2023 |
Post-Medicare: |  |  |
Health care cost trend rate assumed for next year | 6.15 | % |  | 6.50 | %
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 | 2023 |  |  | 2023 |
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 for the year ended December 31, 2018:
| One Percentage- Point Increase |  | One Percentage- Point Decrease
| (Dollars in millions)
Effect on total service and interest cost components | $ | 2.9 |  |  | $ | (2.6 | )
Effect on total postretirement benefit obligation | $ | 50.2 |  |  | $ | (45.7 | )
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] | The following table presents the fair value of assets in the Non-Represented Trust by asset category and by fair value hierarchy:
| December 31, 2018
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (Dollars in millions)
Cash funds | $ | 15.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 15.0 |
Total assets at fair value | $ | 15.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 15.0 |
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)
2019 | $ | 43.4 |
2020 | 45.3 |
2021 | 46.6 |
2022 | 45.8 |
2023 | 44.5 |
Years 2024-2028 | 205.9 |

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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 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=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + 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 (m) -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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