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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
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | $ (950.2) | $ (3,045.1) | $ (3,536.6) | $ (4,071.4)
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 263.8 | 161.0 | (46.0) | (18.4)
(Loss) income from continuing operations, net of income taxes | $ (290.2) | $ (74.3) | $ 42.9 | $ 133.3 | $ 233.5 | $ 83.9 | $ 120.0 | $ 208.3 | (195.5) | $ 713.1 | (188.3) | $ 645.7
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 |  | 0.0 |
Total before income taxes |  |  |  |  |  |  |  |  | (9.1) |  | 0.0 |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 3.3 |  | 0.0 |
(Loss) income from continuing operations, net of income taxes |  |  |  |  |  |  |  |  | (5.8) |  | 0.0 |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Postretirement health care and life insurance benefits |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | (5.5) |  | 0.0 |
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension Plans, Defined Benefit |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | (6.3) |  | 0.0 |
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 |  | 8.7 |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | (0.8) |  | 0.0 |
(Loss) income from continuing operations, net of income taxes |  |  |  |  |  |  |  |  | 1.4 |  | 8.7 |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Postretirement health care and life insurance benefits |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | 2.3 |  | 8.7 |
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension Plans, Defined Benefit |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net periodic benefit costs, excluding service cost/operating expenses |  |  |  |  |  |  |  |  | (0.1) |  | 0.0 |
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) |  | 0.0 |
Income Tax Benefit (Expense) |  |  |  |  |  |  |  |  | 9.1 |  | 0.0 |
(Loss) income from continuing operations, net of income taxes |  |  |  |  |  |  |  |  | (18.6) |  | 0.0 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Fuel and explosives commodity swaps | 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) |  | 0.0 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Foreign currency cash flow hedge 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) |  | 0.0 |
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Insignificant items | 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) |  | $ 0.0 |

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