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Noncontrolling Interests Reconciliation of income from continuing operations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Noncontrolling Interest [Abstract]        
Income (loss) from continuing operations $ 317.1 $ 423.7 $ 918.0 $ 371.2
Income from continuing operations attributable to noncontrolling interests (1.7) (3.4) (7.3) (10.5)
Income (loss) from continuing operations attributable to Ensco $ 315.4 $ 420.3 $ 910.7 $ 360.7