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Property and Equipment (Narratives) (Details) $ in Millions	3 Months Ended				4 Months Ended	5 Months Ended	9 Months Ended
	Jun. 30, 2021 USD ($)	Mar. 31, 2021 $ / bbl	Jun. 30, 2020 USD ($) drillship	Mar. 31, 2020 USD ($)	Apr. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) $ / bbl	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Asset Impairment Charges					$ 756.5	$ 0.0		$ 3,646.2
Number of rigs impaired | drillship			2
Oil and Gas, Average Sale Price | $ / bbl		60					20
Floaters
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 756.5				$ 756.5
Property, Plant, and Equipment, Fair Value Disclosure	$ 26.0
Floaters, Jackups And Spare Equipment
Property, Plant and Equipment [Line Items]
Asset Impairment Charges							$ 3,600.0
Property, Plant, and Equipment, Fair Value Disclosure			$ 69.0	$ 72.3
Impairment of Long-Lived Assets Held-for-use			$ 817.3	$ 2,800.0
Office Building
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Not Part of Disposal Group						$ 2.3	$ 2.3		$ 2.3

X

- Definition

Sales price per unit of oil and gas produced.

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-Publisher SEC
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Fair value portion of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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