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Noncontrolling Interests (Reconciliation Of Income From Discontinued Operations, Net) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2010
Noncontrolling Interests [Abstract]  
Income from discontinued operations $ 29.6
Income from discontinued operations attributable to noncontrolling interests (0.2)
Income from discontinued operations attributable to Ensco $ 29.4