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Segment Information (Narrative) (Details) - 12 months ended Dec. 31, 2021	floater rigs Reportable_segment drillship	jackup	drillship	Total	contract
Segment Reporting Information [Line Items]
Number of operating segments | Reportable_segment	4
Number of contract drilling rigs	56
Number of jackups leased by ARO		7	7
Number of drilling management contracts | contract					2
Total number of contract drilling rigs	56
Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	17
Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	16
Floaters [Member] | Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	2
Floaters [Member] | Ultra Deepwater Drillships [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs | floater	11
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	33
Jackups [Member] | Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	8
ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs | floater	7
Total number of contract drilling rigs	7
ARO | Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	7
ARO | Work in progress | Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs | drillship			2
Jackup Rigs Member [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs | drillship	33
Other [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs				7
Other [Member] | Middle East & Africa [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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

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