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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 471,100,000	$ 814,000,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	278,100,000	363,700,000
Depreciation	109,200,000	113,300,000
General and administrative	26,000,000	23,400,000
OPERATING (LOSS) INCOME	57,800,000	313,600,000
Property and equipment, net	11,120,700,000	11,097,100,000	$ 10,919,300,000
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues	284,800,000	512,600,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	146,400,000	211,300,000
Depreciation	72,800,000	80,300,000
General and administrative	0	0
OPERATING (LOSS) INCOME	65,600,000	221,000,000
Property and equipment, net	8,534,300,000	8,480,600,000
Jackups Member
Segment Reporting Information [Line Items]
Revenues	171,800,000	277,900,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	118,600,000	134,500,000
Depreciation	32,100,000	28,600,000
General and administrative	0	0
OPERATING (LOSS) INCOME	21,100,000	114,800,000
Property and equipment, net	2,532,400,000	2,549,800,000
Other [Member]
Segment Reporting Information [Line Items]
Revenues	14,500,000	23,500,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	13,100,000	17,900,000
Depreciation	0	0
General and administrative	0	0
OPERATING (LOSS) INCOME	1,400,000	5,600,000
Property and equipment, net	0	0
Operating Segments Total [Member]
Segment Reporting Information [Line Items]
Revenues	471,100,000	814,000,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	278,100,000	363,700,000
Depreciation	104,900,000	108,900,000
General and administrative	0	0
OPERATING (LOSS) INCOME	88,100,000	341,400,000
Property and equipment, net	11,066,700,000	11,030,400,000
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	0	0
Depreciation	4,300,000	4,400,000
General and administrative	26,000,000	23,400,000
OPERATING (LOSS) INCOME	(30,300,000)	(27,800,000)
Property and equipment, net	$ 54,000,000	$ 66,700,000

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=66902209&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
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-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-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
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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