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Rowan Transaction Pro Forma Impact of Rowan Transaction (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Estimated bargain purchase gain			$ 659.8	$ 1.8
Rowan Companies
Revenues	$ 552.0	$ 624.0	1,729.5	1,952.0
Net loss	$ (151.1)	$ (250.0)	$ (795.2)	$ (607.1)
Loss per share - basic and diluted (in usd per share)	$ (0.53)	$ (1.27)	$ (3.14)	$ (3.09)
Aggregate of transaction-related and integration costs	$ 16.0		$ 85.4
Estimated bargain purchase gain	$ 53.0		$ 659.8

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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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