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Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented | 3 Months Ended
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Mar. 31, 2018
Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented [Abstract] |
New Accounting Pronouncements and Changes in Accounting Principles [Text Block] | Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented Newly Adopted Accounting Standards Revenue Recognition. In May 2014, the FASB issued Accounting Standards Update (ASU) 2014-09, “Revenue from Contracts with Customers (Topic 606)”, that requires recognition of revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which a company expects to be entitled in exchange for those goods or services. The FASB has also issued several updates to ASU 2014-09. On January 1, 2018, the Company adopted ASU 2014-09 using the modified retrospective method. The new standard provides a single principles-based, five-step model to be applied to all contracts with customers, which steps are to (1) identify the contract(s) with the customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract and (5) recognize revenue when each performance obligation is satisfied. The Company recognized the cumulative effect of initially applying ASU 2014-09 as an adjustment to the opening balance of retained earnings. Revenue previously recognized under contracts completed prior to January 1, 2018 was not impacted by adoption and comparative information has not been restated. The impact of the adoption of ASU 2014-09 is expected to be immaterial to the Company’s results of operations, financial condition, and cash flows on an ongoing basis. The majority of the Company’s coal sales revenue will continue to be recognized as title and risk of loss transfer to the customer at mines and ports when coal is loaded to the transportation source, as further described in Note 3. “Revenue Recognition.” The impact of the adoption of ASU 2014-09 was limited to a long-term contract in which consideration related to the reimbursement of certain post-mining costs was recognized as costs were incurred, which differs in timing compared to the five-step model described above. The cumulative effects to the Company’s consolidated January 1, 2018 balance sheet were to reduce retained earnings for the amount of revenue that would have been deferred and to reduce long-term customer receivables, as noted in the table below:
| Balance at December 31, 2017 |  | Adjustments due to ASU 2014-09 |  | Balance at January 1, 2018
| (Dollars in millions)
ASSETS |  |  |  |  |
Investments and other assets | $ | 470.6 |  |  | $ | (22.5 | ) |  | $ | 448.1 |
STOCKHOLDERS’ EQUITY |  |  |  |  |
Retained earnings | 613.6 |  |  | (22.5 | ) |  | 591.1 |
ASU 2014-09 also requires entities to disclose sufficient qualitative and quantitative information to enable financial statement users to understand the nature, amount, timing and uncertainty of revenues and cash flows arising from contracts with customers. Such disclosures are included in Note 3. “Revenue Recognition.” Classification of Certain Cash Receipts and Cash Payments. In August 2016, the FASB issued ASU 2016-15 to amend the classification of certain cash receipts and cash payments in the statement of cash flows to reduce diversity in practice. The Company retrospectively adopted all the provisions of this new standard in the first quarter of 2018. The classification requirements under the new guidance are either consistent with the Company’s current practices or are not applicable to its activities, and as such, did not have a material impact on classification of cash receipts and cash payments in the Company’s unaudited condensed consolidated statements of cash flows. Restricted Cash. In November 2016, the FASB issued ASU 2016-18, which reduces diversity in the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. The Company retrospectively adopted all the provisions of this new accounting standard in the first quarter of 2018 and as a result of the new guidance, the Company will combine restricted cash with unrestricted cash and cash equivalents when reconciling the beginning and end of period balances on its statements of cash flows. The amendments also require a company to disclose information about the nature of the restrictions and amounts described as restricted cash and restricted cash equivalents. Such disclosures are included in Note 17. “Financial Instruments and Other Guarantees.” Further, as cash, cash equivalents, restricted cash, and restricted cash equivalents are presented in more than one line item on the balance sheet, the Company reconciled these amounts to the total shown in the statement of cash flows in a tabular format within the Company’s unaudited condensed consolidated statements of cash flows. Compensation - Retirement Benefits. In March 2017, the FASB issued ASU 2017-07, which requires employers that sponsor defined benefit pension and other postretirement plans to report the service cost component in the same line item as other compensation costs and to report the other components of net periodic benefit costs (which include interest costs, expected return on plan assets, amortization of prior service cost or credits and actuarial gains and losses) separately and outside a subtotal of operating income on a retrospective basis. The guidance limiting the capitalization of net periodic benefit cost in assets to the service cost component will be applied prospectively. The Company adopted all the provisions of this new accounting standard in the first quarter of 2018. While adoption of this guidance did impact financial statement presentation, it did not materially impact the Company’s results of operations, financial condition, or cash flows. The retrospective impact to the unaudited condensed consolidated statement of operations was as follows:
| Predecessor
| Three Months Ended March 31, 2017
| Before Application of Accounting Guidance |  | Adjustment |  | After Application of Accounting Guidance
| (Dollars in millions)
Results of Operations Amounts |  |  |  |  |
Operating costs and expenses | $ | 963.7 |  |  | $ | (13.5 | ) |  | $ | 950.2 |
Selling and administrative expenses | 37.2 |  |  | (0.9 | ) |  | 36.3 |
Operating profit | 198.1 |  |  | 14.4 |  |  | 212.5 |
Net periodic benefit costs, excluding service cost | — |  |  | 14.4 |  |  | 14.4 |
Income from continuing operations before income taxes | 126.5 |  |  | — |  |  | 126.5 |
Compensation - Stock Compensation. In May 2017, the FASB issued ASU 2017-09 to clarify when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. The Company prospectively applied all the provisions of this new accounting standard on January 1, 2018 and there was no material impact to the Company’s financial statements. Accounting Standards Not Yet Implemented Leases. In February 2016, the FASB issued ASU 2016-02, which will require a lessee to recognize on its balance sheet a liability to make lease payments and a right-of-use asset representing its right to use the underlying asset for the lease term for leases with lease terms of more than 12 months. Consistent with current U.S. GAAP, the recognition, measurement and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. Additional qualitative disclosures along with specific quantitative disclosures will also be required. The new guidance will take effect for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018 (January 1, 2019 for the Company). In November 2017, the FASB voted to propose amendments to the new leases guidance to add two practical expedients. The proposed changes would allow entities to elect a simplified transition approach, and provide lessors with an option related to how lease and other related revenues are presented and disclosed. The Company is in the process of evaluating the impact of ASU 2016-02 and expects, through the addition of significant lease assets and lease liabilities to the consolidated balance sheet, ASU 2016-02 will have a material impact on the consolidated balance sheets (amount will be dependent on leases outstanding at adoption date), but is not expected to have a material impact on the consolidated statements of operations and comprehensive income (loss) of the Company. Financial Instruments - Credit Losses. In June 2016, the FASB issued ASU 2016-13 related to the measurement of credit losses on financial instruments. The pronouncement replaces the incurred loss methodology to record credit losses with a methodology that reflects the expected credit losses for financial assets not accounted for at fair value with gains and losses recognized through net income. This standard is effective for fiscal years beginning after December 15, 2019 (January 1, 2020 for the Company) and interim periods therein, with early adoption permitted for fiscal years, and interim periods therein, beginning after December 15, 2018. The Company is in the process of evaluating the impact that the adoption of this guidance will have on its results of operations, financial condition, cash flows and financial statement presentation. Derivatives and Hedging. In August 2017, the FASB issued ASU 2017-12 to amend the hedge accounting rules to simplify the application of hedge accounting guidance and better align the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. The guidance expands the ability to hedge nonfinancial and financial risk components, reduces complexity in fair value hedges of interest rate risk, eliminates the requirement to separately measure and report hedge ineffectiveness, as well as eases certain hedge effectiveness assessment requirements. The new guidance will be effective for fiscal years beginning after December 15, 2018 (January 1, 2019 for the Company) and interim periods therein, with early adoption permitted. The amendments to cash flow and net investment hedge relationships that exist on the date of adoption will be applied using a modified retrospective approach. The presentation and disclosure requirements will be applied prospectively. The Company is currently evaluating the impact that the adoption of this guidance will have on its results of operations, financial condition, cash flows and financial statement presentation. Leases - Land Easements. In January 2018, the FASB issued ASU 2018-01 to provide an optional transition practical expedient to not evaluate under Topic 842 existing or expired land easements that were not previously accounted for as leases under the current guidance in Topic 840. An entity that elects this practical expedient should evaluate new or modified land easements under Topic 842 beginning at the date that the entity adopts Topic 842. An entity that does not elect this practical expedient should evaluate all existing or expired land easements in connection with the adoption of the new leases requirements in Topic 842 to assess whether they meet the definition of a lease. The amendments in this update affect the amendments in ASU 2016-02. The effective date and transition requirements for the amendments are the same as the effective date and transition requirements in ASU 2016-02. The Company is in the process of evaluating the impact that the adoption of this guidance will have on its results of operations, financial condition, cash flows and financial statement presentation.

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- Definition Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented [Abstract] + References No definition available. + Details
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- Definition The entire disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -URI http://asc.fasb.org/topic&trid=2122394 + Details
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