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Property And Equipment (Narrative) (Details)	3 Months Ended						12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) floater	Mar. 31, 2020 USD ($) $ / bbl	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / bbl	Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Period Increase (Decrease)							$ (5,100,000,000)
Property and equipment	$ 13,209,300,000				$ 18,393,800,000		13,209,300,000	$ 18,393,800,000
Asset Impairment Charges							3,646,200,000	104,000,000.0	$ 40,300,000
Impairment of Long-Lived Assets to be Disposed of	0	$ 0	$ 15,000,000.0	$ 2,800,000,000	10,200,000	$ 88,200,000
Impairment of Long-Lived Assets Held-for-use								$ 0
Assets Held-for-sale, Not Part of Disposal Group	2,300,000						2,300,000
Oil and Gas, Average Sale Price | $ / bbl				20				60
Number of Rigs Impaired | floater			2
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	446,100,000				473,600,000		446,100,000	$ 473,600,000
Construction in Progress [Member] | Ultra Deepwater Drillships [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	418,000,000				$ 418,000,000		418,000,000	418,000,000
Other Rigs [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges							3,600,000,000	$ 98,400,000	$ 40,300,000
Floaters, Jackups And Spare Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant, and Equipment, Fair Value Disclosure			$ 69,000,000.0	$ 72,300,000
Floaters And Spare Equipment [Member]
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use			$ 817,300,000
Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross, Period Increase (Decrease)							(0.29)
Rowan Companies [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,963,800,000						$ 2,963,800,000

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Sales price per unit of oil and gas produced.

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