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Accumulated Other Comprehensive Income - Reclassification from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Successor |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating costs and expenses |  | $ (1,057.2) |
Net periodic benefit costs, excluding service cost |  | 4.5 |
Selling and administrative expenses |  | (37.0) |
Income tax benefit (provision) |  | (10.1) |
Total after income taxes |  | 208.3 |
Successor | Defined benefit pension plans |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net periodic benefit costs, excluding service cost |  | $ (2.3) |
Predecessor |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating costs and expenses |  |  | $ (950.2)
Net periodic benefit costs, excluding service cost |  |  | 14.4
Selling and administrative expenses |  |  | (36.3)
Income tax benefit (provision) |  |  | (2.2)
Total after income taxes |  |  | 124.3
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss associated with postretirement plans and workers' compensation obligations |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Insignificant items | [1] |  | 2.7
Total before income taxes | [1] |  | (9.1)
Income tax benefit (provision) | [1] |  | 3.3
Total after income taxes | [1] |  | (5.8)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Prior service credit associated with postretirement plans |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total before income taxes | [1] |  | 2.2
Income tax benefit (provision) | [1] |  | (0.8)
Total after income taxes | [1] |  | 1.4
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Cash flow hedges |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total before income taxes |  |  | (27.7)
Income tax benefit (provision) | [1] |  | 9.1
Total after income taxes |  |  | (18.6)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Foreign currency cash flow hedge contracts | Cash flow hedges |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating costs and expenses | [1] |  | (16.6)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Fuel and explosives commodity swaps | Cash flow hedges |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Operating costs and expenses | [1] |  | (11.0)
Predecessor | Reclassification out of Accumulated Other Comprehensive Income | Insignificant items | Cash flow hedges |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Insignificant items | [1] |  | (0.1)
Predecessor | Postretirement health care and life insurance benefits | Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss associated with postretirement plans and workers' compensation obligations |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net periodic benefit costs, excluding service cost |  |  | 5.5
Predecessor | Postretirement health care and life insurance benefits | Reclassification out of Accumulated Other Comprehensive Income | Prior service credit associated with postretirement plans |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net periodic benefit costs, excluding service cost | [1] |  | (2.3)
Predecessor | Defined benefit pension plans |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net periodic benefit costs, excluding service cost |  |  | 5.7
Predecessor | Defined benefit pension plans | Reclassification out of Accumulated Other Comprehensive Income | Net actuarial loss associated with postretirement plans and workers' compensation obligations |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net periodic benefit costs, excluding service cost |  |  | 6.3
Predecessor | Defined benefit pension plans | Reclassification out of Accumulated Other Comprehensive Income | Prior service credit associated with postretirement plans |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net periodic benefit costs, excluding service cost | [1] |  | $ 0.1
[1] | Presented as gains (losses) in the unaudited condensed consolidated statements of operations.

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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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