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Segment Information (Narrative) (Details)	9 Months Ended
	Sep. 30, 2021 rigs drillship jackup Reportable_segment
Segment Reporting Information [Line Items]
Number of operating segments (in segments) | Reportable_segment	4
Total Number Of Contract Drilling Rigs	59
Other
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	9
ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs | jackup	7
Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	16
Asia & Pacific Rim
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	8
Asia & Pacific Rim | Other
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
Asia & Pacific Rim | ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	2
Asia & Pacific Rim | Work-in-progress | Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs | drillship	2
North & South America
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	11
North & South America | Other
Segment Reporting Information [Line Items]
Number of Drilling Management Contracts	2
Total Number Of Contract Drilling Rigs	0
North & South America | ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
North & South America | Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	5
Middle East & Africa
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	18
Middle East & Africa | Other
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs | rigs	8
Middle East & Africa | ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs | jackup	7
Middle East & Africa | Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	2
Middle East & Africa | Work-in-progress | ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs | drillship	2

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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