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Debt (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 26, 2021
Mar. 22, 2021
Apr. 01, 2022
Mar. 26, 2021
Dec. 31, 2021
Debt Instrument          
Debt valuation adjustments     $ 0.0 $ 16.3  
Liabilities Subject to Compromise     (6,433.2)   $ (6,397.7)
Long-term Debt          
Debt Instrument          
Liabilities Subject to Compromise     $ (3,746.2)   $ (3,750.8)
Secured Debt          
Debt Instrument          
Debt Instrument, Interest Rate, Increase (Decrease)     200.00%    
Unsecured Debt | 2017 Revolving Credit Facility          
Debt Instrument          
Line of Credit Facility, Maximum Borrowing Capacity     $ 900.0    
Term Loans due Sept 2024 and Feb 2025          
Debt Instrument          
Debt Instrument, Interest Rate, Increase (Decrease) 250.00% 250.00%