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Supplemental Financial Information (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Segment Reporting Information [Line Items]        
Aggregate Contractual Capital Commitments Due In One Year $ 92.9      
Capitalized interest 62.6 $ 72.5 $ 45.7  
Capital expenditure accruals 27.8 $ 234.3 $ 11.5  
ENSCO 123 [Member]        
Segment Reporting Information [Line Items]        
Aggregate Contractual Capital Commitments Paid       $ 207.4
Aggregate Contractual Capital Commitments Due In One Year $ 9.0