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Chapter 11 Proceedings and Ability to Continue as Going Concern - Schedule of Reorganization Items (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reorganizations [Abstract] |  |  |
Write-off of unamortized debt discounts, premiums and issuance costs | $ 447.9 |  |
Contract items | (11.5) |  |
Debtor Reorganization Items, Non-cash | 436.4 | $ 0.0 | $ 0.0
DIP Facility fees | 20.0 |  |
Professional fees | 66.8 |  |
Debtor Reorganization Items, Provision for Expected Allowed Claims | 4.4 |  |
Debtor Reorganization Items, Reorganization Items (Fees) | 91.2 |  |
Reorganization Items, Total | 527.6 | $ 0.0 | $ 0.0
Reorganization items (fees) unpaid | 61.2 |  |
Reorganization items (fees) paid | $ 30.0 |  |

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