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