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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 |

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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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