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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Mar. 31, 2021 jackup rigs
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	61
Floaters
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	16
Jackups
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	36
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	7
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	23
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	16
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	19
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 | rigs	9
Middle East & Africa | ARO
Segment Reporting Information [Line Items]
Total Number Of Contract Drilling Rigs	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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