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Rowan Transaction (Narrative) (Details) $ / shares in Units, € in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 11, 2019 EUR (€) | Apr. 11, 2019 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 EUR (€) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2019 EUR (€) | Dec. 31, 2019 USD ($) | Oct. 23, 2018 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Adjustment |  |  | $ 0 |  |  | $ (712,800,000) |  | $ 6,300,000 | $ (712,800,000) |  |  |  |  |
Tax Assessment |  |  |  | $ 42,000,000 |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Net |  |  | 37,100,000 |  |  |  |  | 37,100,000 |  |  |  |  | $ 99,000,000.0 |
Revenues |  |  | 388,800,000 |  |  | 583,900,000 |  | 845,400,000 | 989,800,000 |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  | (1,107,400,000) |  |  | 405,500,000 |  | (4,113,700,000) | 215,100,000 |  |  |  |  |
Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 16,200,000 | 3,800,000 |  |  |  |  | 3,800,000 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 2,100,000 | 900,000 |  |  |  |  | 900,000 |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  |  |  |  | $ 5,700,000 |  |  |  |  |  |
Finite-Lived Intangible Assets, Remaining Amortization Period |  |  |  |  |  |  | 1 year 6 months | 1 year 6 months |  |  |  |  |  |
Amortization of intangible assets |  |  | 600,000 |  |  |  |  | $ 1,900,000 |  |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition |  | $ 50,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 15,000,000.0 |  |  | $ 17,800,000 |  |  |  |  |
Revenues |  |  |  |  | $ 147,200,000 |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  |  |  |  | $ 95,300,000 |  |  |  |  |  |  |  |  |
Rowan Companies [Member] | Class A ordinary shares, U.S. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  | $ 15.88 |  |  |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.92
Forecast [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Contract Cost, Amortization |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 | $ 900,000 |  |  |
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefit, maximum exposure |  |  |  |  |  |  | € 142.0 | 159,600,000 |  |  |  | € 142.0 |  |
Tax Assessment | € | € 93.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Net |  |  | $ 104,500,000 |  |  |  |  | $ 104,500,000 |  |  |  |  |  |

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