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Supplemental Financial Information (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2018
Segment Reporting Information [Line Items]        
Aggregate Contractual Capital Commitments Due In One Year $ 317.2      
Increase (Decrease) in Other Operating Assets and Liabilities, Net (75.2) $ 27.1    
Capitalized interest 72.5 45.7 $ 87.4  
Capital expenditure accruals 234.3 $ 11.5 $ 60.9  
ENSCO 123 [Member]        
Segment Reporting Information [Line Items]        
Aggregate Contractual Capital Commitments Due In One Year $ 218.3      
Scenario, Forecast | ENSCO 123 [Member]        
Segment Reporting Information [Line Items]        
Aggregate Contractual Capital Commitments Paid       $ 207.4