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Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023 floater rigs contract drillship Reportable_segment
Segment Reporting Information [Line Items]
Number of operating segments | Reportable_segment	4
Number of contract drilling rigs	53
Number of jackups leased by ARO	8
Number of drilling management contracts | contract	2
Total number of contract drilling rigs	53
Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	18
Floaters [Member] | Ultra Deepwater Drillships [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs | floater	13
Floaters [Member] | Dynamically Positioned Semisubmersible [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs | floater	4
Floaters [Member] | Moored Semisubmersible Rigs [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs | floater	1
Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	27
ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs | floater	8
Total number of contract drilling rigs	8
ARO | Work in progress | Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs | drillship	1
Jackup Rigs Member [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs | drillship	27
Other [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	8

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-18

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Number of Drilling Management Contracts

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Number of jackups leased to ARO

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Total Number Of Contract Drilling Rigs

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