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Equity (Tables)
 12 Months Ended
Dec. 31, 2022
Equity [Abstract]  
Schedule of Performance-Vested Restricted Stock Awards, Validation Assumptions The assumptions used to value the PVRSUs include historical volatility and risk-free interest rates over a time period commensurate with the remaining term prior to vesting, as follows for the respective grant dates:
Year EndedPeriod from February 6, 2021 through
December 31, 2022December 31, 2021
 February 3, 2022February 19, 2021October 1, 2021December 1, 2021
Valuation assumptions:   
Expected volatility74.8 %50.0 %92.2 %95.1 %
Expected dividend yield— %— %— %— %
Risk-free interest rate1.42 %0.19 %0.33 %0.58 %
The assumptions used to value the PVRSUs included historical volatility and risk-free interest rates over a time period commensurate with the remaining term prior to vesting, as follows:
 2020
Valuation assumptions: 
Expected volatility69.8 %
Expected dividend yield— %
Risk-free interest rate1.40 %
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity
A summary of the RSUs awarded during the periods indicated is as follows:
Twelve Months Ended December 31, 2022Period from February 6, 2021 through December 31, 2021
Equity-classified TVRSU 
Units awarded 988,750 1,735,843 
Weighted-average share price at award date$27.85 $16.68 
Weighted-average vesting period (years)2.942.94
Liability-classified TVRSU
Units awarded20,120 52,364 
Weighted-average share price at award date$31.25 $16.76 
Weighted-average vesting period (years)1.002.81
PVRSU 
Units awarded 295,372 1,457,842 
Weighted-average share price at award date$25.57 $16.74 
Three-year performance period ended December 3120242023
Weighted-average award date fair value$35.77 $20.82 
A summary of the status of non-vested RSUs at December 31, 2022 and changes for the period from February 6, 2021 through December 31, 2021 is presented below:
Equity-Classified TVRSUs
Outstanding		Weighted
Average
Award-Date
Fair Value
PVRSUs
Outstanding (1)
Weighted
Average
Award-Date
Fair Value
Non-vested RSUs at February 5, 2021 (Successor)— $— — $— 
Awarded1,735,843 16.68 1,457,842 20.82 
Vested— — — — 
Forfeited(66,081)16.44 — — 
Non-vested RSUs at December 31, 20211,669,762 $16.69 1,457,842 $20.82 
Awarded (2)
988,750 27.85 295,372 35.77 
Vested (3)
(1,050,086)21.35 — — 
Forfeited(68,876)20.39 — — 
Non-vested RSUs at December 31, 20221,539,550 $20.51 1,753,214 $35.77 
(1)For awards granted during 2022 and 2021, the number of PVRSUs shown equals the shares that would vest if the “target” level of performance is achieved. The minimum number of units is zero and the “maximum” level of performance is 200 percent of the amounts shown.
(2)Includes approximately 477,785 shares of outstanding TVRSUs that were assumed upon the acquisition of Maersk Drilling. The weighted average grant date fair value on the date of assumption was approximately $29.84 per share.
(3)Includes approximately 336,993 shares of outstanding TVRSUs that vested upon the acquisition of Maersk Drilling. The weighted average vested share price on the date of vesting was approximately $29.84 per share.
A summary of the RSUs awarded for the year ended December 31, 2020 is as follows:
2020
TVRSU 
Units awarded 5,559,678 
Weighted-average share price at award date$0.82 
Weighted-average vesting period (years)3.0
PVRSU 
Units awarded 2,696,774 
Weighted-average share price at award date$0.91 
Three-year performance period ended December 312022
Weighted-average award date fair value$1.14 
A summary of the status of non-vested RSUs at February 5, 2021 and changes during the period from January 1 through February 5, 2021 is presented below:
TVRSUs
Outstanding		Weighted
Average
Award-Date
Fair Value
PVRSUs
Outstanding (1)
Weighted
Average
Award-Date
Fair Value
Non-vested RSUs at January 1, 2021 (Predecessor)2,362,500 $3.43 3,163,113 $3.22 
Awarded— — — — 
Vested(61,050)5.46 — — 
Forfeited or cancelled(2,301,450)3.37 (3,163,113)3.22 
Non-vested RSUs at February 5, 2021 (Predecessor)— $— — $— 
(1)For awards granted during 2020, the number of PVRSUs shown equals the shares that would vest if the “target” level of performance was achieved. The minimum number of shares was zero and the “maximum” level of performance was 200 percent of the amounts shown.
Share-based Payment Arrangement, Option, Activity A summary of the status of stock options granted under the 1991 Plan and the changes during the period ended on February 5, 2021 and December 31, 2020 are presented below:
 February 5, 2021December 31, 2020
Number of
Shares
Underlying
Options		Weighted
Average
Exercise
Price		Number of
Shares
Underlying
Options		Weighted
Average
Exercise
Price
Outstanding at beginning of period556,155 $30.39 708,400 $30.90 
Expired or cancelled(556,155)30.39 (152,245)32.78 
Outstanding at end of period— 556,155 30.39 
Exercisable at end of period— $— 556,155 $30.39