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Chapter 11 Proceedings and Ability to Continue as Going Concern - Schedule of Liabilities Subject to Compromise (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Apr. 30, 2021
Dec. 31, 2020
Aug. 18, 2020
Debt Instrument [Line Items]        
Liabilities Subject To Compromise, Accrued Interest On Notes $ 203.5   $ 201.9  
Liabilities Subject To Compromise, Holding Cost, Inclusive Of Interest 13.9      
Liabilities Subject to Compromise 0.0 $ 0.0 $ 7,313.7  
Senior Notes [Member] | 6.875% Senior notes due 2020        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       6.875%
Liabilities Subject To Compromise, Long-term Debt 122.9      
Senior Notes [Member] | Four Point Seven Zero Percent Senior Notes Due Twenty Twenty One [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       4.70%
Liabilities Subject To Compromise, Long-term Debt 100.7      
Senior Notes [Member] | Four Point Eight Seven Five Percent Senior Notes Due Twenty Twenty Two [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       4.875%
Liabilities Subject To Compromise, Long-term Debt 620.8      
Senior Notes [Member] | Three Point Zero Percent Exchangeable Senior Notes Due Twenty Twenty Four [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       3.00%
Liabilities Subject To Compromise, Long-term Debt 849.5      
Senior Notes [Member] | Four Point Five Percent Senior Notes Due Twenty Twenty Four [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       4.50%
Liabilities Subject To Compromise, Long-term Debt 303.4      
Senior Notes [Member] | Four Point Seven Five Percent Senior Notes Due Twenty Twenty Four [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       4.75%
Liabilities Subject To Compromise, Long-term Debt 318.6      
Senior Notes [Member] | Eight Point Zero Percent Senior Notes Due Twenty Twenty Four [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       8.00%
Liabilities Subject To Compromise, Long-term Debt 292.3      
Senior Notes [Member] | Five Point Two Zero Percent Senior Notes Due Twenty Twenty Five [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       5.20%
Liabilities Subject To Compromise, Long-term Debt 333.7      
Senior Notes [Member] | Seven Point Three Seven Five Senior Notes Due Twenty Twenty Five [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       7.375%
Liabilities Subject To Compromise, Long-term Debt 360.8      
Senior Notes [Member] | Seven Point Seven Five Percent Senior Notes Due Twenty Twenty Six [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       7.75%
Liabilities Subject To Compromise, Long-term Debt 1,000.0      
Senior Notes [Member] | Seven Point Two Zero Percent Debentures Due Twenty Twenty Seven [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       7.20%
Liabilities Subject To Compromise, Long-term Debt 112.1      
Senior Notes [Member] | Seven Point Eight Seven Five Percent Senior Notes Due Twenty Forty [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       7.875%
Liabilities Subject To Compromise, Long-term Debt 300.0      
Senior Notes [Member] | Five Point Four Zero Percent Senior Notes Due Twenty Forty Two [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       5.40%
Liabilities Subject To Compromise, Long-term Debt 400.0      
Senior Notes [Member] | Five Point Seven Five Percent Senior Notes Due Twenty Forty Four [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       5.75%
Liabilities Subject To Compromise, Long-term Debt 1,000.5      
Senior Notes [Member] | Five Point Eight Five Percent Senior Notes Due Twenty Forty Four [Member]        
Debt Instrument [Line Items]        
Debtor-in-Possession Financing, Interest Rate on Borrowings Outstanding       5.85%
Liabilities Subject To Compromise, Long-term Debt 400.0      
Line of Credit [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Liabilities Subject To Compromise, Long-term Debt $ 581.0