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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Jun. 30, 2019 jackup
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	81
Number of Rigs Owned by ARO	7
Number of jackups leased by ARO	9
Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	28
Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	44
Other
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9
ARO
Segment Reporting Information [Line Items]
Number of Rigs Owned by ARO	7
North & South America (Excl. Brazil)
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	21
North & South America (Excl. Brazil) | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	12
North & South America (Excl. Brazil) | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9
Europe & Mediterranean
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	22
Europe & Mediterranean | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	5
Europe & Mediterranean | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	17
Middle East & Africa(2)
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	25
Middle East & Africa(2) | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	5
Middle East & Africa(2) | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11
Middle East & Africa(2) | Other
Segment Reporting Information [Line Items]
Number of jackups leased by ARO	9
Middle East & Africa(2) | ARO
Segment Reporting Information [Line Items]
Number of Rigs Owned by ARO	7
Asia & Pacific Rim
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11
Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4
Asia & Pacific Rim | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	7
Construction in Progress [Member] | Asia & Pacific Rim
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Construction in Progress [Member] | Asia & Pacific Rim | Floaters
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Construction in Progress [Member] | Asia & Pacific Rim | Jackups
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	0

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Number of Rigs Owned by ARO

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Total Number Of Contract Drilling Rigs

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