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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details)	Mar. 31, 2018 rigs
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	65	[1]
Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	27
Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	38
North South America Incl Brazil [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	13	[1]
North South America Incl Brazil [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	9
North South America Incl Brazil [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4
Europe & Mediterranean [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	18	[1]
Europe & Mediterranean [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	6
Europe & Mediterranean [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	12
Middle East [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	14	[1]
Middle East [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3
Middle East [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	13	[1]
Asia Pacific [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	5
Asia Pacific [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	8
Asia & Pacific Rim (under construction) [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3	[1]
Asia & Pacific Rim (under construction) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Asia & Pacific Rim (under construction) [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4	[1]
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | Jackups Member
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
[1] We provide management services on two rigs owned by third-parties in the U.S. Gulf of Mexico which are not included in the table above.

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Total Number Of Contract Drilling Rigs

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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