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Rowan Transaction (Narrative) (Details) $ / shares in Units, € in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 11, 2019 EUR (€) | Apr. 11, 2019 USD ($) $ / shares | Mar. 31, 2020 EUR (€) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 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 |  |  |  | $ 6.3 |  | $ 0.0 |  |  |  |  |
Tax Assessment |  |  |  |  | $ 42.0 |  |  |  |  |  |
Deferred Tax Liabilities, Net |  |  |  | 35.2 |  |  |  |  |  | $ 99.0 |
Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | $ 16.2 |  | 10.4 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 2.1 |  | $ 1.2 |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Remaining Amortization Period |  |  | 1 year 9 months 18 days | 1 year 9 months 18 days |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  | $ 1.3 |  |  |  |  |  |  |
Unrecognized Tax Benefits, Increase Resulting from Acquisition |  | $ 50.4 |  |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  |  | $ 5.9 |  |  |  |  |
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 |  |  |  |  |  |  | $ 5.4 | $ 3.8 |  |  |
Luxembourg Inland Revenue [Member] | Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized tax benefit, maximum exposure |  |  | € 142.0 | 156.7 |  |  |  |  | € 142.0 |  |
Tax Assessment | € | € 93.0 |  |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Net |  |  |  | $ 102.6 |  |  |  |  |  |  |

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