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Revenue from External Customers by Geographic Areas (Details) - Sales Revenue, Services, Net [Member] - Geographic Concentration Risk [Member] - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 1,012,200,000.00 | $ 1,201,400,000.00 | $ 3,235,100,000.00 | $ 3,404,700,000.00
United Kingdom [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 91,500,000 | 117,800,000 | 316,400,000 | 268,700,000
US Gulf Of Mexico [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 363,000,000.00 | $ 447,100,000.00 | $ 972,800,000.00 | $ 1,320,600,000.00
US Gulf Of Mexico [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 90.00% | 80.00% | 86.00% | 78.00%
ANGOLA |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 136,600,000 | $ 150,100,000 | $ 488,300,000 | $ 458,500,000
ANGOLA | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 87.00% | 100.00% | 90.00% | 100.00%
Brazil [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 112,900,000 | $ 115,800,000 | $ 351,300,000 | $ 361,500,000
Other Geographic Areas [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 308,200,000.00 | $ 370,600,000.00 | $ 1,106,300,000.00 | $ 995,400,000.00

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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