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Segment Information (Schedule Of Geographic Distribution Of Rigs By Segment) (Details) - Operating Segments [Member]	Sep. 30, 2016
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	61	[1]
Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	21
Jackup [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	40
North & South America (Excl. Brazil) [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	15	[1]
North & South America (Excl. Brazil) [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	8
North & South America (Excl. Brazil) [Member] | Jackup [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	7
Europe & Mediterranean [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	16	[1]
Europe & Mediterranean [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	5
Europe & Mediterranean [Member] | Jackup [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11
Middle East & Africa [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	12	[1]
Middle East & Africa [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Middle East & Africa [Member] | Jackup [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	10
Asia & Pacific Rim [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	11	[1]
Asia & Pacific Rim [Member] | Construction in Progress [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3	[1]
Asia & Pacific Rim [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4
Asia & Pacific Rim [Member] | Floaters [Member] | Construction in Progress [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
Asia & Pacific Rim [Member] | Jackup [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	7
Asia & Pacific Rim [Member] | Jackup [Member] | Construction in Progress [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	2
Discontinued Operations, Held-for-sale [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	4	[1]
Discontinued Operations, Held-for-sale [Member] | Floaters [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	1
Discontinued Operations, Held-for-sale [Member] | Jackup [Member]
Segment Reporting Information [Line Items]
Number of contract drilling rigs (in rigs)	3
[1] We provide management services on two rigs owned by third-parties not included in the table above.

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- Definition

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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