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Property And Equipment (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) floater | Mar. 31, 2020 USD ($) $ / bbl | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) $ / bbl | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross, Period Increase (Decrease) |  |  |  |  |  |  | $ (5,100,000,000) |  |
Property and equipment | $ 13,209,300,000 |  |  |  | $ 18,393,800,000 |  | 13,209,300,000 | $ 18,393,800,000 |
Asset Impairment Charges |  |  |  |  |  |  | 3,646,200,000 | 104,000,000.0 | $ 40,300,000
Impairment of Long-Lived Assets to be Disposed of | 0 | $ 0 | $ 15,000,000.0 | $ 2,800,000,000 | 10,200,000 | $ 88,200,000 |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  |  | $ 0 |
Assets Held-for-sale, Not Part of Disposal Group | 2,300,000 |  |  |  |  |  | 2,300,000 |  |
Oil and Gas, Average Sale Price | $ / bbl |  |  |  | 20 |  |  |  | 60 |
Number of Rigs Impaired | floater |  |  | 2 |  |  |  |  |  |
Construction in Progress [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment | 446,100,000 |  |  |  | 473,600,000 |  | 446,100,000 | $ 473,600,000 |
Construction in Progress [Member] | Ultra Deepwater Drillships [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment | 418,000,000 |  |  |  | $ 418,000,000 |  | 418,000,000 | 418,000,000 |
Other Rigs [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  | 3,600,000,000 | $ 98,400,000 | $ 40,300,000
Floaters, Jackups And Spare Equipment [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  | $ 69,000,000.0 | $ 72,300,000 |  |  |  |  |
Floaters And Spare Equipment [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  | $ 817,300,000 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Gross, Period Increase (Decrease) |  |  |  |  |  |  | (0.29) |  |
Rowan Companies [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment | $ 2,963,800,000 |  |  |  |  |  | $ 2,963,800,000 |  |

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