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Segment Information (Schedule Of Segment Reporting Information) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 388,800,000	$ 583,900,000	$ 845,400,000	$ 989,800,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	370,700,000	500,300,000	846,700,000	832,900,000
Asset Impairment Charges	838,000,000.0	2,500,000	3,646,200,000	2,500,000
Depreciation expense	131,500,000	157,900,000	296,000,000.0	282,900,000
General and administrative	62,600,000	81,200,000	116,000,000.0	110,800,000
Equity in earnings of ARO	5,200,000	(600,000)	11,500,000	(600,000)
OPERATING LOSS	(1,019,200,000)	(157,400,000)	(4,071,000,000.0)	(238,700,000)
Property and equipment, net	11,192,600,000	15,455,700,000	11,192,600,000	15,455,700,000	$ 15,096,900,000
Operating Segments [Member] | Floaters
Segment Reporting Information [Line Items]
Revenues	163,600,000	295,600,000	343,200,000	528,300,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	170,800,000	249,200,000	384,700,000	431,000,000.0
Asset Impairment Charges	831,900,000	0	3,386,200,000	0
Depreciation expense	62,000,000.0	98,400,000	151,400,000	183,200,000
General and administrative	0	0	0	0
Equity in earnings of ARO	0	0	0	0
OPERATING LOSS	(901,100,000)	(52,000,000.0)	(3,579,100,000)	(85,900,000)
Property and equipment, net	6,536,900,000	10,364,700,000	6,536,900,000	10,364,700,000
Operating Segments [Member] | Jackups
Segment Reporting Information [Line Items]
Revenues	186,300,000	229,200,000	399,100,000	386,200,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	182,700,000	212,200,000	408,800,000	347,600,000
Asset Impairment Charges	400,000	0	254,300,000	0
Depreciation expense	52,800,000	55,500,000	111,300,000	92,400,000
General and administrative	0	0	0	0
Equity in earnings of ARO	0	0	0	0
OPERATING LOSS	(49,600,000)	(38,500,000)	(375,300,000)	(53,800,000)
Property and equipment, net	4,000,600,000	5,055,600,000	4,000,600,000	5,055,600,000
Operating Segments [Member] | ARO
Segment Reporting Information [Line Items]
Revenues	146,000,000.0	123,800,000	286,300,000	123,800,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	112,500,000	78,900,000	220,800,000	78,900,000
Asset Impairment Charges	0	0	0	0
Depreciation expense	13,300,000	12,400,000	26,300,000	12,400,000
General and administrative	7,100,000	5,300,000	15,400,000	5,300,000
Equity in earnings of ARO	0	0	0	0
OPERATING LOSS	13,100,000	27,200,000	23,800,000	27,200,000
Property and equipment, net	739,700,000	656,500,000	739,700,000	656,500,000
Operating Segments [Member] | Other
Segment Reporting Information [Line Items]
Revenues	38,900,000	59,100,000	103,100,000	75,300,000
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	17,200,000	38,900,000	53,200,000	54,300,000
Asset Impairment Charges	5,700,000	0	5,700,000	0
Depreciation expense	11,200,000	0	22,300,000	0
General and administrative	0	0	0	0
Equity in earnings of ARO	0	0	0	0
OPERATING LOSS	4,800,000	20,200,000	21,900,000	21,000,000.0
Property and equipment, net	655,100,000	0	655,100,000	0
Corporate, Non-Segment [Member] | Reconciling Items
Segment Reporting Information [Line Items]
Revenues	(146,000,000.0)	(123,800,000)	(286,300,000)	(123,800,000)
Operating Expenses [Abstract]
Contract drilling (exclusive of depreciation)	(112,500,000)	(78,900,000)	(220,800,000)	(78,900,000)
Asset Impairment Charges	0	2,500,000	0	2,500,000
Depreciation expense	(7,800,000)	(8,400,000)	(15,300,000)	(5,100,000)
General and administrative	55,500,000	75,900,000	100,600,000	105,500,000
Equity in earnings of ARO	5,200,000	(600,000)	11,500,000	(600,000)
OPERATING LOSS	(86,400,000)	(114,300,000)	(162,300,000)	(147,200,000)
Property and equipment, net	$ (739,700,000)	$ (621,100,000)	$ (739,700,000)	$ (621,100,000)

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