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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 551,300,000	$ 430,900,000	$ 1,541,100,000	$ 1,306,400,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	496,500,000	327,100,000	1,329,400,000	996,600,000
Loss on impairment	88,200,000	0	90,700,000	0
Depreciation	163,000,000.0	120,600,000	445,900,000	356,500,000
General and administrative	36,100,000	25,100,000	146,900,000	79,100,000
EQUITY IN EARNINGS OF ARO	3,700,000	0	3,100,000	0
OPERATING LOSS	(236,200,000)	(41,900,000)	(474,900,000)	(125,800,000)
Property and equipment, net	15,250,700,000	12,731,600,000	15,250,700,000	12,731,600,000	$ 12,616,200,000
Operating Segments
Segment Reporting Information [Line Items]
Revenues				0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)				0
Depreciation				10,300,000
General and administrative				79,100,000
OPERATING LOSS				(89,400,000)
Property and equipment, net		39,700,000		39,700,000
Operating Segments | Floaters
Segment Reporting Information [Line Items]
Revenues	269,800,000	241,800,000	798,100,000	785,700,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	250,300,000	175,600,000	681,300,000	564,400,000
Loss on impairment	88,200,000		88,200,000
Depreciation	98,100,000	77,800,000	281,300,000	233,900,000
General and administrative	0	0	0	0
EQUITY IN EARNINGS OF ARO	0		0
OPERATING LOSS	(166,800,000)	(11,600,000)	(252,700,000)	(12,600,000)
Property and equipment, net	10,187,500,000	9,501,700,000	10,187,500,000	9,501,700,000
Operating Segments | Jackups
Segment Reporting Information [Line Items]
Revenues	217,800,000	173,300,000	604,000,000.0	475,400,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	213,500,000	136,400,000	561,100,000	390,100,000
Loss on impairment	0
Depreciation	59,000,000.0	39,300,000	151,400,000	112,300,000
General and administrative	0	0	0	0
EQUITY IN EARNINGS OF ARO	0		0
OPERATING LOSS	(54,700,000)	(2,400,000)	(108,500,000)	(27,000,000.0)
Property and equipment, net	5,022,000,000.0	3,190,200,000	5,022,000,000.0	3,190,200,000
Operating Segments | ARO
Segment Reporting Information [Line Items]
Revenues	138,400,000	0	262,200,000	0
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	92,700,000	0	171,700,000	0
Loss on impairment	0		0
Depreciation	14,600,000	0	26,900,000	0
General and administrative	8,800,000	0	13,900,000	0
EQUITY IN EARNINGS OF ARO	0		0
OPERATING LOSS	22,300,000	0	49,700,000	0
Property and equipment, net	652,500,000	0	652,500,000	0
Operating Segments | Other
Segment Reporting Information [Line Items]
Revenues	63,700,000	15,800,000	139,000,000.0	45,300,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	32,700,000	15,100,000	87,000,000.0	42,100,000
Loss on impairment	0		0
Depreciation	0	0	0	0
General and administrative	0	0	0	0
EQUITY IN EARNINGS OF ARO	0		0
OPERATING LOSS	31,000,000.0	700,000	52,000,000.0	3,200,000
Property and equipment, net	0	0	0	0
Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(138,400,000)	0	(262,200,000)
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	(92,700,000)	0	(171,700,000)
Loss on impairment	0		2,500,000
Depreciation	(8,700,000)	3,500,000	(13,700,000)
General and administrative	27,300,000	25,100,000	133,000,000.0
EQUITY IN EARNINGS OF ARO	3,700,000		3,100,000
OPERATING LOSS	(68,000,000.0)	(28,600,000)	(215,400,000)
Property and equipment, net	$ (611,300,000)	$ 39,700,000	$ (611,300,000)	$ 39,700,000

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