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Interest Expense (Details) (Narratives) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Disclosure [Abstract] |  |  |  |
Interest Expense | $ (2.4) | $ (31.0) | $ (290.6) | $ (428.3)
Interest Costs Capitalized |  |  | 1.3 | $ 20.9
Contractual Interest Expense on Prepetition Liabilities Not Recognized in Statement of Operations | $ 132.9 |  | $ 140.7 |

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- Definition The amount of contractual interest expense on prepetition liabilities not included in the statement of operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124433192&loc=d3e56068-112765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766 + Details
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