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Property and Equipment (Narratives) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021 USD ($) $ / bbl	Mar. 31, 2020 USD ($)	Sep. 30, 2020 $ / bbl	Dec. 31, 2020 USD ($)
Property, Plant and Equipment [Line Items]
Loss on impairment	$ 756.5	$ 2,808.2
Oil and Gas, Average Sale Price | $ / bbl	20		60
Floaters, Jackups And Spare Equipment
Property, Plant and Equipment [Line Items]
Impairment of Long-Lived Assets Held-for-use		2,800.0
Property, Plant, and Equipment, Fair Value Disclosure	$ 26.0	$ 72.3
Office Building
Property, Plant and Equipment [Line Items]
Assets Held-for-sale, Not Part of Disposal Group				$ 2.3

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- Definition

Sales price per unit of oil and gas produced.

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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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