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Property And Equipment (Narrative) (Details) $ in Millions | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 $ / bbl | Dec. 31, 2020 USD ($) $ / bbl | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) drillship | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Apr. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  | $ 13,209.3 |  |  |  |  |  |  | $ 957.0 | $ 13,209.3 |  |
Asset Impairment Charges |  |  |  |  |  |  |  | $ 756.5 | 0.0 | 3,646.2 | $ 104.0 |
Impairment of Long-Lived Assets to be Disposed of |  | 0.0 | $ 0.0 | $ 15.0 |  | $ 10.2 | $ 88.2 |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  |  |  |  |  | 0.0 |
Assets Held-for-sale, Not Part of Disposal Group |  | $ 2.3 |  |  |  |  |  |  |  | 2.3 |  |
Oil and Gas, Average Sale Price | $ / bbl | 20 | 60 |  |  |  |  |  |  |  |  |  |
Number of rigs impaired | drillship |  |  |  | 2 |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  |  | 5.3 | 20.7 |  |  |
Construction in Progress [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  | $ 446.1 |  |  |  |  |  |  | $ 35.6 | 446.1 |  |
Construction in Progress [Member] | Ultra Deepwater Drillships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  | $ 418.0 |  |  |  |  |  |  |  | 418.0 |  |
Other Rigs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  | $ 756.5 |  | $ 3,600.0 | $ 98.4 |
Floaters, Jackups And Spare Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  | $ 817.3 | $ 2,800.0 |  |  |  |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  |  | $ 69.0 | $ 72.3 |  |  |  |  |  |  |
Floaters [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  |  | $ 26.0

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