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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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