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Fresh Start Accounting - Narrative (Details) - USD ($)
 4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Reorganization, Chapter 11 [Line Items]          
Enterprise Value $ 1,860,000,000 $ 1,860,000,000      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 2.81% 2.81%      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 6.03% 6.03% 6.03% 7.10% 6.26%
Property, Plant and Equipment, Net $ 909,100,000 $ 909,100,000 $ 890,900,000 $ 1,633,800,000 $ 977,200,000
Prepaid Rent, Per Rig 8,000,000 8,000,000      
Predecessor, Additional Paid In Capital 0 0      
Treasury Stock, Value $ 0 $ 0      
Common shares, shares issued 75,000,000 75,000,000   75,400,000 75,200,000
Additional paid-in capital $ 1,078,700,000 $ 1,078,700,000   $ 1,119,800,000 $ 1,097,900,000
Class Of Warrant, Exercisable 5,600,000        
Warrants and Rights Outstanding $ 16,400,000 16,400,000   $ 16,400,000 $ 16,400,000
Reorganization, Chapter 11, Plan Effect Adjustment          
Reorganization, Chapter 11 [Line Items]          
Property, Plant and Equipment, Net (417,600,000) (417,600,000)      
Debt Instrument, Face Amount 550,000,000 550,000,000      
Debt Issuance Costs, Net (5,200,000) (5,200,000)      
Common Stock, Value, Issued (800,000) (800,000)      
Predecessor, Additional Paid In Capital 8,644,000,000 8,644,000,000      
Treasury Stock, Value $ 75,500,000 $ 75,500,000      
Common shares, shares issued 75,000,000 75,000,000      
Additional paid-in capital $ 1,078,700,000 $ 1,078,700,000      
Warrants and Rights Outstanding 16,400,000 16,400,000      
Reorganization, Chapter 11, Plan Effect Adjustment | Common Class A And B Shares          
Reorganization, Chapter 11 [Line Items]          
Common Stock, Value, Issued 82,600,000 82,600,000      
Reorganization, Chapter 11, Plan Effect Adjustment | Work in progress          
Reorganization, Chapter 11 [Line Items]          
Property, Plant and Equipment, Net (417,600,000) (417,600,000)      
Minimum          
Reorganization, Chapter 11 [Line Items]          
Enterprise Value 1,860,000,000 1,860,000,000      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets         7.10%
Maximum          
Reorganization, Chapter 11 [Line Items]          
Enterprise Value $ 3,145,000,000 $ 3,145,000,000      
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets       6.88%