Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)	12 Months Ended
	Dec. 31, 2025
Drilling rigs, excluding jackup rigs
Summary of Significant Accounting Policies
Operating rig asset depreciable life, operating days	4927 days
Non-operating rig asset depreciable life	20 years
Jackup rigs
Summary of Significant Accounting Policies
Operating rig asset depreciable life, operating days	8030 days
Non-operating rig asset depreciable life	30 years
Buildings | Minimum
Summary of Significant Accounting Policies
Estimated useful life	10 years
Buildings | Maximum
Summary of Significant Accounting Policies
Estimated useful life	30 years
Oilfield hauling and mobile equipment and other machinery and equipment | Minimum
Summary of Significant Accounting Policies
Estimated useful life	3 years
Oilfield hauling and mobile equipment and other machinery and equipment | Maximum
Summary of Significant Accounting Policies
Estimated useful life	10 years