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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 |

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