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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 $ 201.9   $ 203.5  
Liabilities Subject To Compromise, Holding Cost, Inclusive Of Interest     13.9  
Liabilities Subject to Compromise   $ 0.0 7,313.7  
Senior Notes [Member] | Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Twenty Member        
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%   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%   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%   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%   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%   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