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Supplemental Financial Information Revenue from External Customers by Geographic Areas - Sales Revenue, Services, Net [Member] - Geographic Concentration Risk [Member] - Customer [Domain] - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 1,059,000,000.00 | $ 1,136,600,000.00 | $ 2,222,900,000.00 | $ 2,203,300,000.00
United Kingdom [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 104,300,000 | 86,100,000 | 224,900,000 | 150,900,000
US Gulf Of Mexico [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 271,000,000.00 | $ 464,700,000.00 | $ 609,800,000.00 | $ 873,500,000.00
US Gulf Of Mexico [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 83.00% | 77.00% | 84.00% | 77.00%
Angola [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 182,400,000 | $ 157,800,000 | $ 351,700,000 | $ 308,400,000
Angola [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 91.00% | 100.00% | 90.00% | 100.00%
Brazil [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 115,700,000 | $ 111,200,000 | $ 238,400,000 | $ 245,700,000
Other Geographic Areas [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 385,600,000.00 | $ 316,800,000.00 | $ 798,100,000.00 | $ 624,800,000.00

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