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Accumulated Other Comprehensive Income (Loss) Items Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Apr. 01, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016
Successor |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  |  |  | $ (3,052.7) | $ (4,072.6) |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  |  |  | 161.0 | (18.4) |
Income (loss) from continuing operations, net of income taxes |  | $ 233.5 | $ 83.9 | $ 120.0 | $ 208.3 | $ 378.0 | $ 233.7 | $ 101.4 |  |  | $ 713.1 | $ 645.7 |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | $ (950.2) |  |  |  | $ (4,070.0)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 263.8 |  |  |  | 94.5
Income (loss) from continuing operations, net of income taxes | $ (319.8) |  |  |  |  |  |  |  | (195.5) | $ 124.3 |  |  | (663.8)
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | 2.7 |  |  |  | 11.7
Total before income taxes |  |  |  |  |  |  |  |  | (9.1) |  |  |  | (33.4)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 3.3 |  |  |  | 12.4
Income (loss) from continuing operations, net of income taxes |  |  |  |  |  |  |  |  | (5.8) |  |  |  | (21.0)
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Postretirement Health Coverage |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | (5.5) |  |  |  | (20.4)
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | (6.3) |  |  |  | (24.7)
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total before income taxes |  |  |  |  |  |  |  |  | 2.2 |  |  |  | 8.9
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (0.8) |  |  |  | (3.3)
Income (loss) from continuing operations, net of income taxes |  |  |  |  |  |  |  |  | 1.4 |  |  |  | 5.6
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Postretirement Health Coverage |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | 2.3 |  |  |  | 9.2
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | (0.1) |  |  |  | (0.3)
Predecessor | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total before income taxes |  |  |  |  |  |  |  |  | (27.7) |  |  |  | (232.2)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 9.1 |  |  |  | 85.9
Income (loss) from continuing operations, net of income taxes |  |  |  |  |  |  |  |  | (18.6) |  |  |  | (146.3)
Predecessor | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Commodity swap contracts | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | (11.0) |  |  |  | (86.1)
Predecessor | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Foreign currency option contracts | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | (16.6) |  |  |  | (145.6)
Predecessor | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Other Contract | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | $ (0.1) |  |  |  | $ (0.5)

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