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Revenue from Contracts with Customers Components of Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
 4 Months Ended 8 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Contract with Customer, Asset, Net, Current   $ 0.3 $ 1.4
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent   0.0 0.4
Contract with Customer, Liability, Current   45.8 57.6
Contract with Customer, Liability, Noncurrent   10.8 $ 14.3
Change in Contract With Customer, Asset [Roll Forward]      
Contract with Customer, Asset, after Allowance for Credit Loss $ 1.8 2.2  
Revenue from Contract with Customer, Excluding Assessed Tax 2.3 2.5  
Contract with Customer, Asset, Reclassified to Receivable (1.6) (4.4)  
Fresh Start Accounting Revaluation, Contract Assets (0.3)    
Change in Contract With Customer, Liability [Roll Forward]      
Contract with Customer, Liability 71.9 35.7  
Contract with Customer, Liability, Increase from Cash Receipts 10.2 80.1  
Contract with Customer, Liability, Revenue Recognized, Included In Beginning Balance (14.8)    
Contract with Customer, Liability, Revenue Recognized, Added During Period   (21.5)  
Fresh Start Accounting Revaluation, Contract Liabilities (31.6)    
Contract with Customer, Liability $ 35.7 56.6  
Increase (Decrease) in Contract with Customer, Liability   $ (37.7)