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Revenue from Contracts with Customers Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
 4 Months Ended 5 Months Ended 9 Months Ended
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2021
May 01, 2021
Dec. 31, 2020
Contract Assets          
Fair value of contracts with customers $ 2.2 $ 1.5 $ 1.5 $ 2.2 $ 1.8
Revenue recognized in advance of right to bill customer 2.3 2.3      
Decrease due to transfer to receivables during the period (1.6) (3.0)      
Fresh start accounting revaluation     (0.3)    
Contract Liabilities          
Fair value of contracts with customers 35.7 44.4 44.4 $ 35.7 $ 71.9
Increase due to cash received 10.2 34.2      
Decrease due to amortization of deferred revenue that was included in the beginning contract liability balance $ (14.8)        
Decrease due to amortization of deferred revenue that was added during the period   (10.7)      
Increase (Decrease) in Contract with Customer, Liability   $ (14.8)      
Fresh start accounting revaluation     $ (31.6)