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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 |

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