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Rowan Transaction Pro Forma Impact of Rowan Transaction (Details) - Rowan Companies [Member] - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Business Acquisition, Pro Forma Revenue | $ 552.0 |  | $ 1,729.5
Business Acquisition, Pro Forma Net Income (Loss) | $ (136.0) |  | $ (788.2)
Business Acquisition, Pro Forma Earnings Per Share, Basic (usd per share) | $ (0.48) |  | $ (4.02)
Business Combination, Integration Related Costs | $ 16.0 |  | $ 85.4
Bargain purchase gain | $ 53.0 | $ 630.7 | $ 659.8

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