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Noncontrolling Interests Reconciliation of income from continuing operations (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Noncontrolling Interest [Abstract]        
Income (loss) from continuing operations $ 88.0 $ 317.1 $ 858.4 $ 918.0
Income from continuing operations attributable to noncontrolling interests (2.0) (1.7) (5.4) (7.3)
Income (loss) from continuing operations attributable to Ensco $ 86.0 $ 315.4 $ 853.0 $ 910.7