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Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Continuing Operations Attributable To Ensco) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Income (loss) from continuing operations	$ 30.6	$ 88.0	$ 592.8	$ 177.6	$ (2,375.3)	$ 317.1	$ 272.8	$ 328.1	$ 889.0	$ (1,457.3)	$ (2,689.3)
Income from continuing operations attributable to noncontrolling interests									6.9	8.8	13.8
Income (loss) from continuing operations attributable to Ensco									$ 882.1	$ (1,466.1)	$ (2,703.1)

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

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