Employee Benefit Plans	12 Months Ended
Dec. 31, 2023
Postemployment Benefits [Abstract]
Employee Benefit Plans	14. Employee Benefit Plans Defined Contribution Plans We maintain defined contribution retirement plans for our U.S., U.K., and third-country national (or TCN) employees. The plan for our U.S. employees (or the 401k Plan) is designed to qualify under Section 401(k) of the IRC. Under the 401k Plan, each participant may elect to defer taxation on a portion of his or her eligible earnings, as defined by the 401k Plan, by directing his or her employer to withhold a percentage of such earnings. A participating employee may also elect to make after-tax contributions to the 401k Plan. Under the 401k Plan, the employer may elect to match a percentage of each employee's qualifying annual compensation contributed to the 401k Plan on a pre-tax or Roth elective deferral basis. Participants are fully vested in any employer match immediately upon enrollment in the 401k Plan. During 2023, we matched 100% of the first 4% of each employee's qualifying annual compensation contributed to the 401k Plan and, in 2022, matched 50% of the first 6% of each employee's qualifying annual compensation contributed to the plan. Our provision for contributions was $5.4 million and $3.2 million for the Successor years ended December 31, 2023 and 2022, respectively. There was no provision for contributions to the 401k Plan for the Successor period from April 24, 2021 through December 31, 2021 and the Predecessor period from January 1, 2021 through April 23, 2021, as contributions to the plan were suspended effective November 2020 and did not resume until 2022. The defined contribution retirement plan for our U.K. employees provides that we make annual contributions in an amount equal to the employee's contributions to the plan, generally up to a maximum percentage of the employee's defined compensation per year. Our contributions during 2023, 2022 and 2021 for employees working in the U.K. sector of the North Sea was 5.25%, 4% and 4%, respectively, of the employee's defined compensation. Our provision for contributions was $1.8 million, $0.9 million, $0.6 million and $0.3 million for the Successor periods for the years ended December 31, 2023 and 2022 and from April 24, 2021 through December 31, 2021 and the Predecessor period from January 1, 2021 through April 23, 2021, respectively. The defined contribution retirement plan for our TCN employees (or the International Savings Plan) is similar to the 401k Plan. During 2023, we matched 100% of the first 4% of each employee's qualifying annual compensation contributed to the International Savings Plan, and in 2022 matched 50% of the first 6% of each employee's qualifying annual compensation contributed to the plan. Our provision for contributions was $0.1 million and $0.1 million for the Successor years ended December 31, 2023 and 2022, respectively. There was no provision for contributions to the International Savings Plan for the Successor period from April 24, 2021 through December 31, 2021 and the Predecessor period from January 1, 2021 through April 23, 2021, as contributions to the plan were suspended effective November 2020 and did not resume until 2022. Deferred Compensation and Supplemental Executive Retirement Plan Our Amended and Restated Diamond Offshore Management Company Supplemental Executive Retirement Plan, or Supplemental Plan, provides benefits to a select group of our management or other highly compensated employees to compensate such employees for any portion of the applicable percentage of the base salary contribution and/or matching contribution under the 401k Plan that could not be contributed to that plan because of limitations within the Code. We ceased matching contributions to the Supplemental Plan effective January 2020.

Employee Benefit Plans

12 Months Ended

Dec. 31, 2023

14. Employee Benefit Plans

Defined Contribution Plans

We maintain defined contribution retirement plans for our U.S., U.K., and third-country national (or TCN) employees.

The plan for our U.S. employees (or the 401k Plan) is designed to qualify under Section 401(k) of the IRC. Under the 401k Plan, each participant may elect to defer taxation on a portion of his or her eligible earnings, as defined by the 401k Plan, by directing his or her employer to withhold a percentage of such earnings. A participating employee may also elect to make after-tax contributions to the 401k Plan. Under the 401k Plan, the employer may elect to match a percentage of each employee's qualifying annual compensation contributed to the 401k Plan on a pre-tax or Roth elective deferral basis. Participants are fully vested in any employer match immediately upon enrollment in the 401k Plan.

During 2023, we matched 100% of the first 4% of each employee's qualifying annual compensation contributed to the 401k Plan and, in 2022, matched 50% of the first 6% of each employee's qualifying annual compensation contributed to the plan. Our provision for contributions was $5.4 million and $3.2 million for the Successor years ended December 31, 2023 and 2022, respectively. There was no provision for contributions to the 401k Plan for the Successor period from April 24, 2021 through December 31, 2021 and the Predecessor period from January 1, 2021 through April 23, 2021, as contributions to the plan were suspended effective November 2020 and did not resume until 2022.

The defined contribution retirement plan for our U.K. employees provides that we make annual contributions in an amount equal to the employee's contributions to the plan, generally up to a maximum percentage of the employee's defined compensation per year. Our contributions during 2023, 2022 and 2021 for employees working in the U.K. sector of the North Sea was 5.25%, 4% and 4%, respectively, of the employee's defined compensation. Our provision for contributions was $1.8 million, $0.9 million, $0.6 million and $0.3 million for the Successor periods for the years ended December 31, 2023 and 2022 and from April 24, 2021 through December 31, 2021 and the Predecessor period from January 1, 2021 through April 23, 2021, respectively.

The defined contribution retirement plan for our TCN employees (or the International Savings Plan) is similar to the 401k Plan. During 2023, we matched 100% of the first 4% of each employee's qualifying annual compensation contributed to the International Savings Plan, and in 2022 matched 50% of the first 6% of each employee's qualifying annual compensation contributed to the plan. Our provision for contributions was $0.1 million and $0.1 million for the Successor years ended December 31, 2023 and 2022, respectively. There was no provision for contributions to the International Savings Plan for the Successor period from April 24, 2021 through December 31, 2021 and the Predecessor period from January 1, 2021 through April 23, 2021, as contributions to the plan were suspended effective November 2020 and did not resume until 2022.

Deferred Compensation and Supplemental Executive Retirement Plan

Our Amended and Restated Diamond Offshore Management Company Supplemental Executive Retirement Plan, or Supplemental Plan, provides benefits to a select group of our management or other highly compensated employees to compensate such employees for any portion of the applicable percentage of the base salary contribution and/or matching contribution under the 401k Plan that could not be contributed to that plan because of limitations within the Code. We ceased matching contributions to the Supplemental Plan effective January 2020.