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Accumulated Other Comprehensive Income (Loss) Components of Comprehensive Income (Loss), After-tax (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015
Successor |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Reclassification for realized losses on cash flow hedges (net of respective net tax provision of $0.0, $0.0, $9.1, and $85.9) included in net income |  | $ 0.0 | $ 0.0 |  |
Foreign currency translation adjustment |  | 1.4 | (5.9) |  |
Net actuarial loss for the period |  | 0.0 | 0.0 |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax |  | 0.0 | (44.6) |  |
Other Comprehensive Income Loss Current Period Change Net Of Tax |  |  | 38.7 |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  | 1.4 | 40.1 |  |
Successor | Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Foreign currency translation adjustment |  | 1.4 | (5.9) |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax |  | 1.4 | (4.5) |  |
Successor | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Net actuarial loss for the period |  | 0.0 | 0.0 |  |
Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Postretirement Plans And Workers Compensation Obligation Net Of Tax |  | 0.0 | 0.0 |  |
Successor | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax |  | 0.0 | 44.6 |  |
Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net of tax |  | 0.0 | 44.6 |  |
Successor | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other Comprehensive Income, Derivatives Qualifying As Hedges, Net Unamortized (Gain) Loss Arising During Period, Net of Tax |  | 0.0 | 0.0 |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax |  | 0.0 | 0.0 |  |
Successor | AOCI Attributable to Parent |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Foreign currency translation adjustment |  | 1.4 | (5.9) |  |
Other Comprehensive Income Loss Current Period Change Net Of Tax |  | 1.4 |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax |  | $ 1.4 | $ 40.1 |  |
Predecessor |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Reclassification for realized losses on cash flow hedges (net of respective net tax provision of $0.0, $0.0, $9.1, and $85.9) included in net income | $ 18.6 |  |  | $ 146.3 |
Other Comprehensive Income Reclassification Adjustment Net Of Tax | 23.0 |  |  | 161.7 |
Foreign currency translation adjustment | 5.5 |  |  | (1.8) |
Net actuarial loss for the period | 0.0 |  |  | (13.5) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax | 0.0 |  |  | 4.5 |
Other Comprehensive Income Loss Current Period Change Net Of Tax | 5.5 |  |  | (19.8) |
Other Comprehensive Income (Loss), Fresh Start Reporting Adjustments | 448.5 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax | 0.0 |  |  | (477.0) | $ (618.9)
Predecessor | Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Translation Adjustment Functional to Reporting Currency, Gain (Loss), Reclassified to Earnings, Net of Tax | 0.0 |  |  | 0.0 |
Foreign currency translation adjustment | 5.5 |  |  | (1.8) |
Other Comprehensive Income (Loss), Fresh Start Reporting Adjustments | 142.7 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | 0.0 |  |  | (148.2) | (146.4)
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax | 5.8 |  |  | 21.0 |
Net actuarial loss for the period | 0.0 |  |  | (13.5) |
Other Comprehensive Income (Loss), Fresh Start Reporting Adjustments | 250.5 |  |  |  |
Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Postretirement Plans And Workers Compensation Obligation Net Of Tax | 0.0 |  |  | (256.3) | (263.8)
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax | (1.4) |  |  | (5.6) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax | 0.0 |  |  | (4.5) |
Other Comprehensive Income (Loss), Fresh Start Reporting Adjustments | (20.3) |  |  |  |
Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net of tax | 0.0 |  |  | 21.7 | 31.8
Predecessor | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Other Comprehensive Income, Derivatives Qualifying As Hedges, Net Unamortized (Gain) Loss Arising During Period, Net of Tax | 0.0 |  |  | 0.0 |
Other Comprehensive Income (Loss), Fresh Start Reporting Adjustments | 75.6 |  |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | 0.0 |  |  | (94.2) | $ (240.5)
Predecessor | AOCI Attributable to Parent |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |  |
Foreign currency translation adjustment | $ 5.5 |  |  | $ (1.8) |

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994 + Details
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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- Definition Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32211-110900 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a-c) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32157-110900 + Details
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