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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Sep. 30, 2020 rigs contract jackup
Segment Reporting Information [Line Items]
Number of Drilling Management Contracts | contract	2
Number of contract drilling rigs (in rigs)	66
Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	19
Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	38
Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9
ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs) | jackup	7
North & South America (Excl. Brazil)
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11
North & South America (Excl. Brazil) | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	5
North & South America (Excl. Brazil) | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	6
Europe & the Mediterranean
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	21
Europe & the Mediterranean | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	7
Europe & the Mediterranean | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	14
Middle East & Africa
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	21
Middle East & Africa | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Middle East & Africa | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	10
Middle East & Africa | Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9
Middle East & Africa | ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs) | jackup	7
Asia & Pacific Rim
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	8
Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Asia & Pacific Rim | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	6
Work-in-progress | Asia & Pacific Rim
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Work-in-progress | Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Work-in-progress | Asia & Pacific Rim | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0

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