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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