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Rowan Transaction Pro Forma Impact of Rowan Transaction (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	Apr. 11, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Bargain purchase gain				$ 712.8	$ 8.3
Rowan Companies [Member]
Business Acquisition, Pro Forma Revenue		$ 599.0	$ 699.8	1,179.5	1,328.0
Business Acquisition, Pro Forma Net Income (Loss)		$ (264.9)	$ (172.6)	$ (596.4)	$ (373.5)
Business Acquisition, Pro Forma Earnings Per Share, Basic (usd per share)		$ (1.35)	$ (0.88)	$ (3.04)	$ (1.90)
Business Acquisition, Transaction Costs		$ 71.5		$ 80.8
Bargain purchase gain	$ 712.8

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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