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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Predecessor          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax       $ 0.0  
Other Comprehensive Income (Loss), Postretirement Plans and Workers' Compensation Obligations, Period Increase Decrease, Net of Tax       0.0  
Other Comprehensive Income (Loss), Prior Service Cost Associated with Postretirement Plans, Period Increase Decrease, Net of Tax       0.0  
Decrease in fair value of cash flow hedges $ 0.0   $ 0.0 (131.3)  
Translation Adjustment Functional to Reporting Currency, Gain (Loss), Reclassified to Earnings, Net of Tax 0.0   0.0 0.0  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (5.8)   (21.0) (35.6)  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax (1.4)   (5.6) (3.7)  
Reclassification for realized losses (gains) included in net loss (18.6)   (146.3) (251.7)  
Other Comprehensive Income Reclassification Adjustment Net Of Tax 23.0   161.7 283.6  
Foreign currency translation adjustment 5.5   (1.8) (34.9)  
Net actuarial (loss) gain for the period 0.0   (13.5) 18.1  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax 0.0   4.5 (10.4)  
Other Comprehensive Income, Derivatives Qualifying As Hedges, Net Unamortized (Gain) Loss Arising During Period, Net of Tax 0.0   0.0 0.0  
Other Comprehensive Income Loss Current Period Change Net Of Tax 5.5   (19.8) (6.4)  
Other Comprehensive Income (Loss), Fresh Start Reporting Adjustments 448.5        
Accumulated Other Comprehensive Loss Net Change in Fair Value of Cash Flow Hedges and Available for Sale Securities       (131.3)  
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax   $ 0.0 (148.2) (146.4) $ (111.5)
Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Postretirement Plans And Workers Compensation Obligation Net Of Tax   0.0 (256.3) (263.8) (317.5)
Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net of tax   0.0 21.7 31.8 25.1
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) (360.9)
Accumulated Other Comprehensive Income (Loss), Net of Tax   0.0 (477.0) (618.9) $ (764.8)
Predecessor | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Other Comprehensive Income (Loss), Fresh Start Reporting Adjustments 142.7        
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), Fresh Start Reporting Adjustments 250.5        
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), Fresh Start Reporting Adjustments (20.3)        
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 (Loss), Fresh Start Reporting Adjustments 75.6        
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) $ (34.9)  
Successor          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Decrease in fair value of cash flow hedges   0.0      
Reclassification for realized losses (gains) included in net loss   0.0      
Foreign currency translation adjustment   1.4      
Net actuarial (loss) gain for the period   0.0      
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax   0.0      
Other Comprehensive Income, Derivatives Qualifying As Hedges, Net Unamortized (Gain) Loss Arising During Period, Net of Tax   0.0      
Other Comprehensive Income Loss Current Period Change Net Of Tax   1.4      
Accumulated Other Comprehensive Income (Loss), Net of Tax   1.4      
Successor | Accumulated Foreign Currency Adjustment Attributable to Parent [Member]          
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]          
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax   1.4      
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]          
Accumulated Other Comprehensive Income Loss Acturial Loss Associated With Postretirement Plans And Workers Compensation Obligation Net Of Tax   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]          
Accumulated Other Comprehensive Income Loss Prior Service Cost Credit Arising During Period Net of tax   0.0      
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]          
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax   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      
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ 1.4