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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 814,000,000	$ 1,163,900,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	363,700,000	518,300,000
Depreciation	113,300,000	137,100,000
General and administrative	23,400,000	30,100,000
OPERATING (LOSS) INCOME	313,600,000	478,400,000
Property and equipment, net	11,097,100,000	12,725,300,000	$ 11,087,800,000
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues	512,600,000	695,000,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	211,300,000	293,500,000
Depreciation	80,300,000	93,000,000
General and administrative	0	0
OPERATING (LOSS) INCOME	221,000,000	308,500,000
Property and equipment, net	8,480,600,000	9,453,500,000
Jackups Member
Segment Reporting Information [Line Items]
Revenues	277,900,000	428,300,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	134,500,000	191,500,000
Depreciation	28,600,000	41,500,000
General and administrative	0	0
OPERATING (LOSS) INCOME	114,800,000	195,300,000
Property and equipment, net	2,549,800,000	3,195,200,000
Other [Member]
Segment Reporting Information [Line Items]
Revenues	23,500,000	40,600,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	17,900,000	33,300,000
Depreciation	0	0
General and administrative	0	0
OPERATING (LOSS) INCOME	5,600,000	7,300,000
Property and equipment, net	0	0
Operating Segments Total [Member]
Segment Reporting Information [Line Items]
Revenues	814,000,000	1,163,900,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	363,700,000	518,300,000
Depreciation	108,900,000	134,500,000
General and administrative	0	0
OPERATING (LOSS) INCOME	341,400,000	511,100,000
Property and equipment, net	11,030,400,000	12,648,700,000
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	0	0
Depreciation	4,400,000	2,600,000
General and administrative	23,400,000	30,100,000
OPERATING (LOSS) INCOME	(27,800,000)	(32,700,000)
Property and equipment, net	$ 66,700,000	$ 76,600,000

X

- Definition

The expense recognized in the current period that allocates the cost of a tangible asset used in providing revenue generating services over the asset's useful life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(d))
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 8
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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