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v3.21.1

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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