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Acquisition Of Atwood Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Earnings per share - basic and diluted (in usd per share)	$ (0.49)	$ (0.08)	$ (0.15)	$ (0.09)	$ 0.13	$ 0.28	$ 2.04	$ 0.74	$ (0.91)	$ 3.13	$ (6.88)
Merger-related costs, excluded from revenue and EPS									$ 80.7
Atwood Oceanics, Inc.
Business Acquisition [Line Items]
Revenues									2,243.0	$ 3,622.1
Net income (loss)									$ (168.7)	$ 1,284.9
Earnings per share - basic and diluted (in usd per share)									$ (0.39)	$ 3.18

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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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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