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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	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition, Pro Forma Revenue	$ 552.0		$ 1,729.5
Business Acquisition, Pro Forma Net Income (Loss)	$ (136.0)		$ (788.2)
Business Acquisition, Pro Forma Earnings Per Share, Basic (usd per share)	$ (0.48)		$ (4.02)
Business Combination, Integration Related Costs	$ 16.0		$ 85.4
Bargain purchase gain	$ 53.0	$ 630.7	$ 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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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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