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Noncontrolling Interests Reconciliation of income from continuing operations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Noncontrolling Interest [Abstract]        
(Loss) income from continuing operations $ (44.7) $ 592.8 $ (68.7) $ 770.4
Income from continuing operations attributable to noncontrolling interests (1.2) (2.0) (2.3) (3.4)
(Loss) income from continuing operations attributable to Ensco $ (45.9) $ 590.8 $ (71.0) $ 767.0