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Description Of The Business And Summary Of Significant Accounting Policies (Schedule Of Income From Discontinued Operations Attributable To Ensco) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]                      
(Loss) income from discontinued operations $ (95.0) $ (23.3) $ (10.1) $ (0.2) $ (388.0) $ 9.2 $ (818.4) $ (2.0) $ (128.6) $ (1,199.2) $ (2.2)
Income from discontinued operations attributable to noncontrolling interests                 (0.1) (0.3) (1.2)
(Loss) income from discontinued operations attributable to Ensco                 $ (128.7) $ (1,199.5) $ (3.4)