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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Dec. 31, 2020 rigs
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	61
Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	16
Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	36
Other [Member]
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 (Excluding Brazil) [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	11
North & South America (Excluding Brazil) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	5
North & South America (Excluding Brazil) [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	6
North & South America (Excluding Brazil) [Member] | Other [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	0
North & South America (Excluding Brazil) [Member] | ARO
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	0
Europe & Mediterranean [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	23
Europe & Mediterranean [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	7
Europe & Mediterranean [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	16
Europe & Mediterranean [Member] | Other [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	0
Europe & Mediterranean [Member] | ARO
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	0
Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	19
Middle East & Africa [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	2
Middle East & Africa [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	8
Middle East & Africa [Member] | Other [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	9
Middle East & Africa [Member] | ARO
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	7
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	8
Asia Pacific [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	2
Asia Pacific [Member] | Jackups [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	6
Asia Pacific [Member] | Other [Member]
Segment Reporting Information [Line Items]
Total number of contract drilling rigs	0
Asia Pacific [Member] | 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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