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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 405,900,000	$ 417,000,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	332,600,000	325,200,000
Cost, Depreciation	125,000,000	115,200,000
General and administrative	29,600,000	27,900,000
OPERATING LOSS	(81,300,000)	(51,300,000)
Property and equipment, net	12,508,900,000	12,834,800,000	$ 12,616,200,000
Floaters [Member]
Segment Reporting Information [Line Items]
Revenues	232,700,000	259,000,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	181,800,000	185,100,000
Cost, Depreciation	84,800,000	75,300,000
General and administrative	0	0
OPERATING LOSS	(33,900,000)	(1,400,000)
Property and equipment, net	9,383,600,000	9,636,900,000
Jackups Member
Segment Reporting Information [Line Items]
Revenues	157,000,000	143,400,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	135,400,000	126,900,000
Cost, Depreciation	36,900,000	36,500,000
General and administrative	0	0
OPERATING LOSS	(15,300,000)	(20,000,000)
Property and equipment, net	3,091,700,000	3,154,300,000
Other [Member]
Segment Reporting Information [Line Items]
Revenues	16,200,000	14,600,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	15,400,000	13,200,000
Cost, Depreciation	0	0
General and administrative	0	0
OPERATING LOSS	800,000	1,400,000
Property and equipment, net	0	0
Operating Segments Total [Member]
Segment Reporting Information [Line Items]
Revenues	405,900,000	417,000,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	332,600,000	325,200,000
Cost, Depreciation	121,700,000	111,800,000
General and administrative	0	0
OPERATING LOSS	(48,400,000)	(20,000,000)
Property and equipment, net	12,475,300,000	12,791,200,000
Reconciling Items [Member]
Segment Reporting Information [Line Items]
Revenues	0	0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	0	0
Cost, Depreciation	3,300,000	3,400,000
General and administrative	29,600,000	27,900,000
OPERATING LOSS	(32,900,000)	(31,300,000)
Property and equipment, net	$ 33,600,000	$ 43,600,000

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Amount of expense for allocation of cost of tangible asset over its useful life directly used in production of good and rendering of service.

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