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Newly Adopted Accounting Standards and Accounting Standards Not Yet Implemented | 3 Months Ended
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Mar. 31, 2019
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 Leases. In February 2016, the FASB issued Accounting Standards Update (ASU) 2016-02, “Leases (Topic 842),” to increase transparency and comparability among organizations by requiring the recognition of right-of-use (ROU) assets and lease liabilities on the balance sheet for leases with lease terms of more than 12 months. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. The FASB has continued to clarify this guidance through the issuance of additional updates to ASU 2016-02. On January 1, 2019, the Company adopted ASU 2016-02 using the modified transition approach and elected the package of practical expedients offered under ASU 2016-02, as updated, that allows it to forgo reassessment of lease classification for leases that have already commenced. The Company also elected the practical expedients to adopt ASU 2016-02 without restating comparative prior period financial information, to not recognize ROU assets and lease liabilities for operating leases with shorter than 12 month terms and to include both lease and non-lease components within lease payments. The Company has implemented the systems functionality and internal control processes necessary to comply with the new reporting requirements of ASU 2016-02. The Company recognized the cumulative effect of initially applying ASU 2016-02 as an adjustment on January 1, 2019 and comparative information presented herein has not been restated. ASU 2016-02 had a material impact on the Company's consolidated balance sheet but did not have a material impact on its results of operations or its cash flows. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases upon adoption, as set forth in the table below. The Company's accounting for finance leases remained unchanged.
| Adoption of ASU 2016-02 January 1, 2019
| (Dollars in millions)
ASSETS |
Operating lease right-of-use assets | $ | 109.3 |
Total assets | $ | 109.3 |
LIABILITIES |
Accounts payable and accrued expenses | $ | 41.8 |
Total current liabilities | 41.8 |
Operating lease liabilities, less current portion | 67.5 |
Total liabilities | $ | 109.3 |
ASU 2016-02 also requires entities to disclose certain qualitative and quantitative information regarding the amount, timing, and uncertainty of cash flows arising from leases. Such disclosures are included in Note 11. “Leases.” Leases to explore for or use minerals, oil, natural gas and similar non-regenerative resources, including the intangible rights to explore for those natural resources and rights to use the land in which those natural resources are contained are excluded from the scope of ASU 2016-02. As such, the adoption of ASU 2016-02 did not impact the accounting for the coal reserve leases under which the Company mines a substantial amount of its coal production. Such leases typically require royalties to be paid as the coal is mined and sometimes require minimum annual royalties to be paid regardless of the amount of coal mined during the year. 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 prior leasing guidance. On January 1, 2019, the Company adopted the expedient to evaluate new or modified land easements under Topic 842, and it did not have a material impact on the Company’s results of operations, financial condition, cash flows or financial statement presentation. Accounting Standards Not Yet Implemented 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 update and expects to adopt ASU 2016-13 as of January 1, 2020 with no material impact to the Company’s results of operations, financial condition, cash flows or financial statement presentation. Fair Value Measurement. In August 2018, the FASB issued ASU 2018-13, which amended the fair value measurement guidance by removing and modifying certain disclosure requirements, while also adding new disclosure requirements. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The amendments are effective for all companies for fiscal years, and interim periods within those years, beginning after December 15, 2019. Early adoption is permitted for all amendments. Further, a company may elect to early adopt the removal or modification of disclosures immediately and delay adoption of the new disclosure requirements until the effective date. The Company plans to adopt all disclosure requirements effective January 1, 2020. Compensation - Retirement Benefits. In August 2018, the FASB issued ASU 2018-14 to add, remove and clarify disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. ASU 2018-14 is effective for fiscal years ending after December 15, 2020 for public companies and early adoption is permitted. The Company plans to adopt the disclosure requirements effective January 1, 2021.

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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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