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Rowan Transaction Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Earnings per share - basic and diluted (in usd per share) | $ (1.09) | $ (1.00) | $ 2.09 | $ (1.75) | $ (1.88) | $ (1.34) | $ (1.39) | $ (1.29) | $ (1.14) | $ (5.90) | $ (3.66)
Bargain purchase gain |  |  |  |  |  |  |  |  | $ 637.0 | $ 1.8 | $ 140.2
Rowan Companies [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,240.5 | 2,530.4 |
Net loss |  |  |  |  |  |  |  |  | $ (994.3) | $ (796.5) |
Earnings per share - basic and diluted (in usd per share) |  |  |  |  |  |  |  |  | $ (3.80) | $ (4.05) |
Merger-related costs, excluded from revenue and EPS |  |  |  |  |  |  |  |  | $ 108.1 | $ 13.8 |
Bargain purchase gain |  |  |  |  |  |  |  |  | $ 637.0 |  |

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