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Postretirement Health Care and Life Insurance Benefits Reconciliation of Postretirement Plans' Funded Status to the Balance Sheet (Details)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
years
Dec. 31, 2016
USD ($)
years
Successor        
Change in plan assets:        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax   $ 0.0 $ (44.6)  
Successor | Postretirement Health Care and Life Insurance Benefits        
Change in benefit obligation:        
Accumulated postretirement benefit obligation at beginning of period     783.3  
Service cost   6.9 8.2  
Interest cost   24.2 28.3  
Participant contributions   0.4 0.5  
Plan amendments   0.0 (51.7)  
Benefits paid   (29.3) (44.8)  
Actuarial gain   (22.0) (128.4)  
Fresh start reporting adjustments   0.0 0.0  
Accumulated postretirement benefit obligation at end of period   783.3 595.4  
Change in plan assets:        
Fair value of plan assets at beginning of period   0.0 0.0  
Employer contributions   28.9 59.3  
Participant contributions   0.4 0.5  
Benefits paid and administrative fees (net of Medicare Part D reimbursements)   (29.3) (44.8)  
Fair value of plan assets at end of period $ 0.0 0.0 15.0  
Funded status at end of period   (783.3) (580.4)  
Less: Current portion (included in “Accounts payable and accrued expenses”)   53.3 32.7  
Noncurrent obligation (included in “Accrued postretirement benefit costs”)   (730.0) $ (547.7)  
Remaining service period for remaining eligible employees | years     5.9  
Successor | Annual Benefits | Postretirement Health Care and Life Insurance Benefits        
Change in benefit obligation:        
Plan amendments     $ 50.2  
Successor | Limitation of eligibility based on age and service criteria | Postretirement Health Care and Life Insurance Benefits        
Change in benefit obligation:        
Plan amendments     1.5  
Successor | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Change in plan assets:        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax   0.0 $ 44.6  
Predecessor        
Change in plan assets:        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax 0.0     $ 4.5
Predecessor | Postretirement Health Care and Life Insurance Benefits        
Change in benefit obligation:        
Accumulated postretirement benefit obligation at beginning of period 812.1 803.1    
Service cost 2.3     10.4
Interest cost 8.4     34.5
Participant contributions 0.2      
Plan amendments 0.0      
Benefits paid (12.8)      
Actuarial gain 0.0     0.0
Fresh start reporting adjustments (7.1)      
Accumulated postretirement benefit obligation at end of period 803.1     812.1
Change in plan assets:        
Fair value of plan assets at beginning of period 0.0 $ 0.0    
Employer contributions 12.6      
Participant contributions 0.2      
Benefits paid and administrative fees (net of Medicare Part D reimbursements) (12.8)      
Fair value of plan assets at end of period 0.0     $ 0.0
Funded status at end of period (803.1)      
Less: Current portion (included in “Accounts payable and accrued expenses”) 56.1      
Noncurrent obligation (included in “Accrued postretirement benefit costs”) (747.0)      
Remaining service period for remaining eligible employees | years       10.3
Predecessor | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]        
Change in plan assets:        
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax $ 0.0     $ (4.5)