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Property And Equipment (Narrative) (Details) $ in Millions		1 Months Ended		3 Months Ended							4 Months Ended	6 Months Ended	8 Months Ended	12 Months Ended
	Apr. 15, 2020 $ / bbl	Apr. 30, 2021 USD ($)	Dec. 31, 2019 $ / bbl	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($) drillship	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Apr. 30, 2021 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Asset Impairment Charges				$ 34.5	$ 34.5	$ 5.6					$ 756.5		$ 0.0	$ 34.5	$ 3,646.2
Oil and Gas, Average Sale Price | $ / bbl	20		60
Number of rigs impaired | drillship						2
Gain (Loss) on Disposition of Other Assets		$ 5.3							$ 2.7	$ 8.6			$ 20.7
Impairment of Long-Lived Assets to be Disposed of								$ 0.0		$ 15.0
Operating Segments [Member] | Jackups Member
Property, Plant and Equipment [Line Items]
Asset Impairment Charges											$ 0.0			0.0	$ 254.3
V54 | Operating Segments [Member] | Forecast [Member] | Jackups Member
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Other Assets												$ 28.0
V113 & V114 | Operating Segments [Member] | Jackups Member
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Other Assets														130.5
V100 | Jackups Member
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Other Assets														3.2
V68 | Jackups Member
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Other Assets														$ 7.0
Floaters, Jackups And Spare Equipment [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges						$ 817.3	$ 2,800.0
Property, Plant, and Equipment, Fair Value Disclosure						69.0	$ 72.3
Floaters [Member]
Property, Plant and Equipment [Line Items]
Asset Impairment Charges						$ 756.5
Property, Plant, and Equipment, Fair Value Disclosure																$ 26.0

X

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Sales price per unit of oil and gas produced.

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