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Contingencies (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
plaintiffs
occurrence
Mar. 31, 2009
mi
Oil and Gas Delivery Commitments and Contracts [Line Items]        
Litigation Settlement, Amount Paid by Underwriters   $ 3.2    
Distance from original drilling location in miles | mi       95
Loss Contingency, Damages Sought, Value     $ 5.0  
Civil litigation claim damages for cost of repair and business interruption due to pipeline rupture     26.0  
Liability insurance self-insured retention per occurrence     10.0  
Annual liability coverage limit for wreckage and debris removal costs     490.0  
Liability insurance self-insured retention     $ 15.0  
Number of Occurrences | occurrence     2  
Liability insurance self insured retention for each occurrence thereafter     $ 1.0  
Litigation Settlement, Amount   9.6    
Legal Fees   $ 3.6    
Payments for Legal Settlements $ 6.4      
Number of plaintiffs | plaintiffs     65  
Loss Contingency, Claims Settled, Number | plaintiffs     58  
Letters of Credit Outstanding, Amount     $ 229.6  
Ensco 29 [Member]        
Oil and Gas Delivery Commitments and Contracts [Line Items]        
Annual liability coverage limit for wreckage and debris removal costs     $ 3.8