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Rowan Transaction Pro Forma Impact of Rowan Transaction (Details) - Rowan Companies [Member] - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition, Pro Forma Revenue	$ 599.0		$ 1,179.5
Business Acquisition, Pro Forma Net Income (Loss)	$ (271.3)		$ (591.8)
Business Acquisition, Pro Forma Earnings Per Share, Basic (usd per share)	$ (1.38)		$ (3.02)
Business Combination, Integration Related Costs	$ 71.5		$ 80.8
Bargain purchase gain		$ 630.7	$ 712.8

X

- 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.

+ References

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

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