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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Sep. 30, 2021 rigs jackup
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	59
Held-for-sale
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	2
Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	16
Floaters | Held-for-sale
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
Jackups
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	34
Jackups | Held-for-sale
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	1
Other
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	9
Other | Held-for-sale
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	1
ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs | jackup	7
ARO | Held-for-sale
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
North & South America
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	11
North & South America | Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	5
North & South America | Jackups
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	6
North & South America | Other
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
North & South America | ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
Europe & the Mediterranean
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	20
Europe & the Mediterranean | Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	7
Europe & the Mediterranean | Jackups
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	13
Europe & the Mediterranean | Other
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
Europe & the Mediterranean | ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	0
Middle East & Africa
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	18
Middle East & Africa | Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	2
Middle East & Africa | Jackups
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	8
Middle East & Africa | Other
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	8
Middle East & Africa | ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs | jackup	7
Asia & Pacific Rim
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	8
Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	2
Asia & Pacific Rim | Jackups
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	6
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

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Total Number Of Contract Drilling Rigs

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