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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, 2016
Dec. 31, 2015
Amounts recognized in the consolidated balance sheets:        
Liabilities Subject to Compromise $ (8,416.7)   $ (8,440.2)  
Predecessor        
Change in benefit obligation:        
Actuarial loss     32.3  
Amounts recognized in the consolidated balance sheets:        
Liabilities Subject to Compromise     (8,440.2)  
Fresh Start Adjustment, Fair Value Adjustment 0.0   0.0 $ 0.0
Predecessor | Pension Plan [Member]        
Change in benefit obligation:        
Projected benefit obligation at beginning of period 959.3 $ 936.4 939.3  
Service cost 0.6   2.5 2.7
Interest cost 9.7   41.5 40.4
Benefits paid (15.0)   (61.1)  
Actuarial loss 0.0   (37.1)  
Projected benefit obligation at end of period 936.4   959.3 939.3
Fair value of plan assets at beginning of period 773.0   757.3  
Actual (loss) return on plan assets 25.1   75.7  
Employer contributions 0.0   1.1  
Benefits paid (15.0)   (61.1)  
Fair value of plan assets at end of period     773.0 $ 757.3
Funded status at end of year (153.3)   (186.3)  
Amounts recognized in the consolidated balance sheets:        
Noncurrent obligation (included in Other noncurrent liabilities) (153.3)   (163.5)  
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Other 0.0      
Liabilities Subject to Compromise     (22.8)  
Net amount recognized (153.3)   (186.3)  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement 0.0   0.0  
Fresh Start Adjustment, Fair Value Adjustment 18.2   0.0  
Defined Benefit Plan, Plan Assets, Payment for Settlement 0.0   $ 0.0  
Successor        
Change in benefit obligation:        
Projected benefit obligation at beginning of period   803.1    
Service cost   6.9    
Interest cost   24.2    
Benefits paid   (29.3)    
Actuarial loss   (22.0)    
Plan amendments   0.0    
Projected benefit obligation at end of period 803.1 783.3    
Fair value of plan assets at beginning of period   0.0    
Employer contributions   28.9    
Benefits paid   (29.3)    
Fair value of plan assets at end of period 0.0 0.0    
Funded status at end of year   (783.3)    
Amounts recognized in the consolidated balance sheets:        
Current obligation (included in Accounts payable and accrued expenses)   (53.3)    
Liabilities Subject to Compromise   0.0    
Fresh Start Adjustment, Fair Value Adjustment   (22.5)    
Successor | Pension Plan [Member]        
Change in benefit obligation:        
Projected benefit obligation at beginning of period   936.4    
Service cost   1.6    
Interest cost   28.0    
Benefits paid   (45.3)    
Actuarial loss   (25.3)    
Projected benefit obligation at end of period 936.4 874.6    
Fair value of plan assets at beginning of period   783.1    
Actual (loss) return on plan assets   80.1    
Employer contributions   30.1    
Benefits paid   (45.3)    
Fair value of plan assets at end of period $ 783.1 776.6    
Funded status at end of year   (98.0)    
Amounts recognized in the consolidated balance sheets:        
Noncurrent obligation (included in Other noncurrent liabilities)   0.0    
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Other   (98.0)    
Net amount recognized   (98.0)    
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement   71.4    
Fresh Start Adjustment, Fair Value Adjustment   0.0    
Defined Benefit Plan, Plan Assets, Payment for Settlement   $ 71.4