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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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