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Pension and Postretirement Benefit Costs (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Apr. 02, 2017
plan
Successor      
Components of net periodic benefit cost      
Net periodic pension (benefit) cost $ 4.5    
Successor | Defined benefit pension plans      
Components of net periodic benefit cost      
Service cost for benefits earned 0.6    
Interest cost on projected benefit obligation 7.8    
Expected return on plan assets (10.7)    
Amortization of prior service cost and net actuarial loss 0.0    
Net periodic pension (benefit) cost $ (2.3)    
Other Defined Benefit Plan Information [Abstract]      
Funding threshold 80.00%    
Number of non-qualified pension plans prior to reorganization | plan     2
Defined Contribution Plan, Employer Discretionary Contribution Amount $ 30.0    
Successor | Postretirement benefit plans      
Components of net periodic benefit cost      
Service cost for benefits earned 2.0    
Interest cost on projected benefit obligation 7.1    
Amortization of prior service cost and net actuarial loss 0.0    
Net periodic pension (benefit) cost $ 9.1    
Predecessor      
Components of net periodic benefit cost      
Net periodic pension (benefit) cost   $ 14.4  
Predecessor | Defined benefit pension plans      
Components of net periodic benefit cost      
Service cost for benefits earned   0.6  
Interest cost on projected benefit obligation   9.7  
Expected return on plan assets   (11.0)  
Amortization of prior service cost and net actuarial loss   6.4  
Net periodic pension (benefit) cost   5.7  
Predecessor | Postretirement benefit plans      
Components of net periodic benefit cost      
Service cost for benefits earned   2.3  
Interest cost on projected benefit obligation   8.4  
Amortization of prior service cost and net actuarial loss   3.2  
Net periodic pension (benefit) cost   $ 13.9