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

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