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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 417,000,000	$ 471,100,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	325,200,000	278,100,000
Depreciation	115,200,000	109,200,000
General and administrative	27,900,000	26,000,000
OPERATING INCOME (LOSS)	(51,300,000)	57,800,000
Property and equipment, net	12,834,800,000	11,120,700,000	$ 12,873,700,000
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues	259,000,000	284,800,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	185,100,000	146,400,000
Depreciation	75,300,000	72,800,000
General and administrative	0	0
OPERATING INCOME (LOSS)	(1,400,000)	65,600,000
Property and equipment, net	9,636,900,000	8,534,300,000
Jackups Member
Segment Reporting Information [Line Items]
Revenues	143,400,000	171,800,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	126,900,000	118,600,000
Depreciation	36,500,000	32,100,000
General and administrative	0	0
OPERATING INCOME (LOSS)	(20,000,000)	21,100,000
Property and equipment, net	3,154,300,000	2,532,400,000
Other [Member]
Segment Reporting Information [Line Items]
Revenues	14,600,000	14,500,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	13,200,000	13,100,000
Depreciation	0	0
General and administrative	0	0
OPERATING INCOME (LOSS)	1,400,000	1,400,000
Property and equipment, net	0	0
Operating Segments Total [Member]
Segment Reporting Information [Line Items]
Revenues	417,000,000	471,100,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	325,200,000	278,100,000
Depreciation	111,800,000	104,900,000
General and administrative	0	0
OPERATING INCOME (LOSS)	(20,000,000)	88,100,000
Property and equipment, net	12,791,200,000	11,066,700,000
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	0	0
Depreciation	3,400,000	4,300,000
General and administrative	27,900,000	26,000,000
OPERATING INCOME (LOSS)	(31,300,000)	(30,300,000)
Property and equipment, net	$ 43,600,000	$ 54,000,000

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=98514028&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
-Paragraph 2
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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
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-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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