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Accumulated Other Comprehensive Income - Reclassification from AOCI (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Apr. 01, 2017 | Sep. 30, 2017 | Sep. 30, 2018
Successor |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Net periodic benefit costs, excluding service cost |  | $ (1,047.9) | $ (1,039.1) |  | $ (1,967.0) | $ (3,051.6)
Net periodic benefit costs, excluding service cost |  | 4.5 | 6.6 |  | 13.2 | 13.6
Net periodic benefit costs, excluding service cost |  | (38.6) | (33.7) |  | (68.4) | (119.7)
Income tax benefit (provision) |  | 13.8 | (84.1) |  | (79.4) | 31.3
Total after income taxes |  | 83.9 | 233.7 |  | 335.1 | 412.2
Successor | Defined benefit pension plans |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Net periodic benefit costs, excluding service cost |  | $ (2.2) | $ (1.3) |  | $ (2.6) | $ (6.8)
Predecessor |  |  |  |  |  |
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Net periodic benefit costs, excluding service cost |  |  |  | $ (950.2) |  |
Net periodic benefit costs, excluding service cost |  |  |  | 14.4 |  |
Net periodic benefit costs, excluding service cost |  |  |  | (36.3) |  |
Income tax benefit (provision) |  |  |  | (263.8) |  |
Total after income taxes |  |  |  | (195.5) |  |
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] |  |  |  |  |  |
Net periodic benefit costs, excluding service cost | [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] |  |  |  |  |  |
Net periodic benefit costs, excluding service cost | [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 | [1] |  |  | 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 | [1] |  |  | 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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