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Contingencies (Narrative) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2015
USD ($)
plaintiffs
Mar. 31, 2009
mi
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Distance from original drilling location in miles | mi   95
Loss Contingency, Damages Sought, Value $ 5.0  
Number of plaintiffs | plaintiffs 60  
Loss Contingency, Claims Settled, Number | plaintiffs 58  
Loss Contingency, Claims Settled Pending Documentation, Number | plaintiffs 18  
Letters of Credit Outstanding, Amount $ 95.8  
Ensco 29 [Member]    
Oil and Gas Delivery Commitments and Contracts [Line Items]    
Annual liability coverage limit for wreckage and debris removal costs $ 3.8