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Property and Equipment (Narratives) (Details) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended				4 Months Ended	6 Months Ended		12 Months Ended
	Apr. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($) drillship	Mar. 31, 2020 USD ($)	Apr. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) $ / bbl	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) $ / bbl
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 0.0	$ 0.0			$ 838.0		$ 756.5		$ 3,646.2
Number of rigs impaired | drillship					2
Oil and Gas, Average Sale Price | $ / bbl								20		60
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			$ 832.3					$ 3,600.0
Property, Plant, and Equipment, Fair Value Disclosure					$ 69.0	$ 72.3			$ 69.0
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		$ 1.0	$ 1.0					$ 1.0		$ 2.3

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Sales price per unit of oil and gas produced.

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