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Rowan Transaction Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Earnings per share - basic and diluted (in usd per share) | $ (24.42) | $ (1.14) | $ (5.90)
Rowan Companies [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Revenues |  | $ 2,240.5 |
Net loss |  | $ (997.8) |
Earnings per share - basic and diluted (in usd per share) |  | $ (3.82) |
Merger-related costs, excluded from revenue and EPS |  | $ 108.1 |
Bargain purchase gain | $ 630.7 | $ 637.0 |

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