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Chapter 11 Proceedings and Ability to Continue as Going Concern - Schedule of Reorganization Items (Details) - USD ($)
$ in Millions
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reorganizations [Abstract]        
DIP facility fees $ 0.0 $ 0.0 $ 20.0  
Professional fees 93.4 17.2 66.8  
Contract items 3.9 (1.7) 4.4  
Reorganization items (fees) 97.3 15.5 91.2  
Backstop Commitment Fees 0.0 0.0 447.9  
Contract items 0.5 0.0 (11.5)  
Backstop premium 30.0 0.0 0.0  
Debtor Reorganization Items, Gain (Loss) on Settlement of Other Claims, Net (6,139.0) 0.0 0.0  
Debtor Reorganization items, Issuance Of Equity Backstop Premium 29.1 0.0 0.0  
Debtor Reorganization Items, Issuance Of Common Shares To The Shipyard 5.4 0.0 0.0  
Debtor Reorganization items, Share-Based Compensation Expense 16.0 0.0 0.0  
Debtor Reorganization items, Contract For Property, Plant And Equipment 350.7 0.0 0.0  
Debtor Reorganization items, Loss On Fresh-Start Adjustments 9,194.6 0.0 0.0  
Debtor Reorganization Items, Non-cash 3,487.3 0.0 436.4 $ 0.0
Reorganization Items, Total 3,584.6 15.5 527.6 $ 0.0
Debtor Reorganization Items, Items (Fees), Unpaid 38.3 0.8 61.2  
Debtor Reorganization Items, Items (Fees), Paid $ 59.0 $ 14.7 $ 30.0