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Share-Based Compensation Textuals (Details)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Apr. 01, 2017
years
shares
Dec. 31, 2017
USD ($)
shares
Successor    
Share-Based Compensation Textuals [Abstract]    
Unrecognized compensation cost related to nonvested awards net of tax Total | $   $ 57.5
Unrecognized compensation cost period for recognition, years 2 years 6 months  
Unrecognized compensation cost period for recognition, weighted-average, years | years 1.0  
Successor | Restricted Stock Units (RSUs) [Member]    
Share-Based Compensation Textuals [Abstract]    
Vesting period of performance units   3 years
Total fair value of restricted stock awards granted | $   $ 79.8
Total fair value of restricted stock awards vested | $   $ 0.9
Common Stock | Successor    
Share-Based Compensation Textuals [Abstract]    
Number of Shares Authorized | shares   10.5
Effect of Plan | 2017 Incentive Plan    
Share-Based Compensation Expense and Cash Flows (Line Items)    
Common stock reserved for future issuance | shares 14.0  
Effect of Plan | Predecessor | 2017 Incentive Plan    
Share-Based Compensation Expense and Cash Flows (Line Items)    
Common stock reserved for future issuance | shares 14.0