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Description Of The Business And Summary Of Significant Accounting Policies Description Of The Business And Summary Of Significant Accounting Policies (Reconciliation Of Net Income Attributable To Ensco Shares Used In Basic And Diluted EPS Computations) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]      
Income (Loss) from Continuing Operations Attributable to Parent $ (2,703.1)us-gaap_IncomeLossFromContinuingOperations $ 1,421.6us-gaap_IncomeLossFromContinuingOperations $ 1,069.6us-gaap_IncomeLossFromContinuingOperations
Other Preferred Stock Dividends and Adjustments 7.9us-gaap_OtherPreferredStockDividendsAndAdjustments 15.1us-gaap_OtherPreferredStockDividendsAndAdjustments 11.2us-gaap_OtherPreferredStockDividendsAndAdjustments
Income (Loss) from Continuing Operations Attributable to Parent, Available to Common Stockholders $ (2,711.0)esv_IncomeLossfromContinuingOperationsAttributabletoParentAvailabletoCommonStockholders $ 1,406.5esv_IncomeLossfromContinuingOperationsAttributabletoParentAvailabletoCommonStockholders $ 1,058.4esv_IncomeLossfromContinuingOperationsAttributabletoParentAvailabletoCommonStockholders