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Segment Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2025 rigs jackup contract floater drillship Reportable_segment
Segment Reporting Information [Line Items]
Number of operating segments | Reportable_segment	4
Number of jackups leased by ARO	7
Number of drilling management contracts | contract	2
Total number of contract drilling rigs	46
Number of Reportable Segments | Reportable_segment	4
ARO Rigs Under Construction | jackup	2
Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	15
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	2
Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	24
ARO
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	9
Jackup Rigs Member [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs | drillship	24
Other [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	7

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/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 49
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-49

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-18

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
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ARO Rig Currently Under Construction

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- Definition

Number Of Contract Drilling Rig

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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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