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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Sep. 30, 2019 jackup
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	81
Number of jackups leased by ARO	9
Held for Sale
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	28
Floaters | Held for Sale
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	44
Jackups | Held for Sale
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9
Other | Held for Sale
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	7
ARO | Held for Sale
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
North & South America (Excl. Brazil)
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	19
North & South America (Excl. Brazil) | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11
North & South America (Excl. Brazil) | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	8
North & South America (Excl. Brazil) | Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
North & South America (Excl. Brazil) | ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Europe & Mediterranean
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	21
Europe & Mediterranean | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	6
Europe & Mediterranean | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	15
Europe & Mediterranean | Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Europe & Mediterranean | ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Middle East & Africa
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	27
Middle East & Africa | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	5
Middle East & Africa | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	13
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)	7
Asia & Pacific Rim
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	10
Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3
Asia & Pacific Rim | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	7
Asia & Pacific Rim | Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Asia & Pacific Rim | ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Construction in Progress | Asia & Pacific Rim
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Construction in Progress | Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Construction in Progress | Asia & Pacific Rim | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Construction in Progress | Asia & Pacific Rim | Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0
Construction in Progress | Asia & Pacific Rim | ARO
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0

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Number of jackups leased by ARO

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Total Number Of Contract Drilling Rigs

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