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Property And Equipment (Narrative) (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 15, 2020 $ / bbl | Apr. 30, 2021 USD ($) | Dec. 31, 2019 $ / bbl | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) drillship | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Apr. 30, 2021 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  | $ 34.5 | $ 34.5 | $ 5.6 |  |  |  |  | $ 756.5 |  | $ 0.0 | $ 34.5 | $ 3,646.2 |
Oil and Gas, Average Sale Price | $ / bbl | 20 |  | 60 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of rigs impaired | drillship |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  | $ 5.3 |  |  |  |  |  |  | $ 2.7 | $ 8.6 |  |  | $ 20.7 |  |  |
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  |  |  | $ 0.0 |  | $ 15.0 |  |  |  |  |  |
Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  |  |  |  |  |  | $ 0.0 |  |  | 0.0 | $ 254.3 |
V54 | Operating Segments [Member] | Forecast [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  |  |  |  |  |  | $ 28.0 |  |  |  |
V113 & V114 | Operating Segments [Member] | Jackups Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 130.5 |  |
V100 | Jackups Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.2 |  |
V68 | Jackups Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.0 |  |
Floaters, Jackups And Spare Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  | $ 817.3 | $ 2,800.0 |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  |  |  |  | 69.0 | $ 72.3 |  |  |  |  |  |  |  |  |
Floaters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  | $ 756.5 |  |  |  |  |  |  |  |  |  |
Property, Plant, and Equipment, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26.0

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