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Segment Information (Schedule Of Segment Reporting Information) (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) contract	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of drilling management contracts | contract	2								2
Revenues	$ 512.1	$ 551.3	$ 583.9	$ 405.9	$ 399.0	$ 430.9	$ 458.5	$ 417.0	$ 2,053.2	$ 1,705.4	$ 1,843.0
Operating expenses - Contract drilling (exclusive of depreciation)									1,806.0	1,319.4	1,189.5
Loss on impairment	13.3	88.2	2.5	0.0	40.3	0.0	0.0	0.0	104.0	40.3	182.9
Depreciation expense	163.8	163.0	157.9	125.0	122.4	120.6	120.7	115.2	609.7	478.9	444.8
General and administrative	42.0	36.1	81.2	29.6	23.6	25.1	26.1	27.9	188.9	102.7	157.8
Income (Loss) from Equity Method Investments	9.5	3.7	(0.6)	0.0					12.6	0.0	0.0
OPERATING LOSS	(193.1)	$ (236.2)	$ (157.4)	$ (81.3)	(110.1)	$ (41.9)	$ (32.6)	$ (51.3)	(668.0)	(235.9)	(132.0)
Property and equipment, net	15,096.9				12,616.2				15,096.9	12,616.2	12,873.7
Capital expenditures									227.0	426.7	536.7
Floaters [Member]
Segment Reporting Information [Line Items]
OPERATING LOSS										(35.7)	47.2
Floaters [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues									1,014.4	1,013.5	1,143.5
Operating expenses - Contract drilling (exclusive of depreciation)									898.6	737.4	624.2
Loss on impairment									88.2	0.0	174.7
Depreciation expense									378.6	311.8	297.4
General and administrative									0.0	0.0	0.0
Income (Loss) from Equity Method Investments									0.0
OPERATING LOSS									(351.0)
Property and equipment, net	10,073.1				9,465.6				10,073.1	9,465.6	9,650.9
Capital expenditures									31.4	105.5	470.3
Jackups [Member]
Segment Reporting Information [Line Items]
OPERATING LOSS										(89.2)	(11.5)
Jackups [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues									834.6	630.9	640.3
Operating expenses - Contract drilling (exclusive of depreciation)									788.9	526.5	512.1
Loss on impairment									10.2	40.3	8.2
Depreciation expense									212.4	153.3	131.5
General and administrative									0.0	0.0	0.0
Income (Loss) from Equity Method Investments									0.0
OPERATING LOSS									(176.9)
Property and equipment, net	4,322.7				3,114.1				4,322.7	3,114.1	3,177.6
Capital expenditures									184.6	317.7	62.1
ARO | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues									410.5	0.0	0.0
Operating expenses - Contract drilling (exclusive of depreciation)									280.2	0.0	0.0
Loss on impairment									0.0	0.0	0.0
Depreciation expense									40.3	0.0	0.0
General and administrative									27.1	0.0	0.0
Income (Loss) from Equity Method Investments									0.0
OPERATING LOSS									62.9	0.0	0.0
Property and equipment, net	650.7				0.0				650.7	0.0	0.0
Capital expenditures									27.5	0.0	0.0
Other [Member]
Segment Reporting Information [Line Items]
OPERATING LOSS										5.5	6.0
Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues									204.2	61.0	59.2
Operating expenses - Contract drilling (exclusive of depreciation)									118.5	55.5	53.2
Loss on impairment									0.0	0.0	0.0
Depreciation expense									0.0	0.0	0.0
General and administrative									0.0	0.0	0.0
Income (Loss) from Equity Method Investments									0.0
OPERATING LOSS									85.7
Property and equipment, net	701.1				0.0				701.1	0.0	0.0
Capital expenditures									0.0	0.0	0.0
Reconciling Items [Member] | Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Revenues									(410.5)	0.0	0.0
Operating expenses - Contract drilling (exclusive of depreciation)									(280.2)	0.0	0.0
Loss on impairment									5.6	0.0	0.0
Depreciation expense									(21.6)	13.8	15.9
General and administrative									161.8	102.7	157.8
Income (Loss) from Equity Method Investments									12.6
OPERATING LOSS									(288.7)	(116.5)	(173.7)
Property and equipment, net	$ (650.7)				$ 36.5				(650.7)	36.5	45.2
Capital expenditures									$ (16.5)	$ 3.5	$ 4.3

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