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Pension and Savings Plans Change in Benefit Obligation, Plan Assets and Funded Status of Pension Plans (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
Successor        
Amounts recognized in the consolidated balance sheets:        
Take-or-pay contract-based intangible recognition   $ 22.5 $ 26.7  
Successor | Pension Plan        
Change in benefit obligation:        
Accumulated postretirement benefit obligation at beginning of period   936.4 874.6  
Service cost   1.6 2.3  
Interest cost   28.0 31.4  
Benefits paid   (45.3) (55.1)  
Actuarial gain   (25.3) 57.3  
Accumulated postretirement benefit obligation at end of period $ 936.4 874.6 795.9  
Fair value of plan assets at beginning of period   783.1 776.6  
Actual (loss) return on plan assets   80.1 (18.7)  
Employer contributions   30.1 62.0  
Benefits paid and administrative fees (net of Medicare Part D reimbursements)   (45.3) (55.1)  
Fair value of plan assets at end of period 783.1 776.6 764.8  
Funded status at end of year   (98.0) (31.1)  
Amounts recognized in the consolidated balance sheets:        
Noncurrent obligation (included in Other noncurrent liabilities)   (98.0) (31.1)  
Net amount recognized   (98.0) (31.1)  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement   (71.4) 0.0  
Take-or-pay contract-based intangible recognition   0.0 0.0  
Defined Benefit Plan, Plan Assets, Payment for Settlement   (71.4) 0.0  
Predecessor        
Amounts recognized in the consolidated balance sheets:        
Take-or-pay contract-based intangible recognition 0.0     $ 0.0
Predecessor | Pension Plan        
Change in benefit obligation:        
Accumulated postretirement benefit obligation at beginning of period   936.4 959.3  
Service cost 0.6     2.5
Interest cost 9.7     $ 41.5
Benefits paid (15.0)      
Actuarial gain 0.0      
Accumulated postretirement benefit obligation at end of period 936.4 959.3    
Fair value of plan assets at beginning of period   783.1 $ 773.0  
Actual (loss) return on plan assets 25.1      
Employer contributions 0.0      
Benefits paid and administrative fees (net of Medicare Part D reimbursements) (15.0)      
Fair value of plan assets at end of period 783.1 $ 773.0    
Funded status at end of year (153.3)      
Amounts recognized in the consolidated balance sheets:        
Noncurrent obligation (included in Other noncurrent liabilities) (153.3)      
Net amount recognized (153.3)      
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 0.0      
Take-or-pay contract-based intangible recognition (18.2)      
Defined Benefit Plan, Plan Assets, Payment for Settlement $ 0.0