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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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