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Supplemental Financial Information Supplemental Financial Information (Major Customers) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 100.00% | 100.00% | 100.00%
BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | [1] | 18.00% | 16.00% | 10.00%
Petrobras [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | [2] | 14.00% | 9.00% | 14.00%
Other Customers [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 68.00% | 75.00% | 76.00%
Floaters [Member] | BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 80.00% | 84.00% | 81.00%
Sales Revenue, Net [Member] | Ensco DS-4 [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  | $ 110,600,000.0 |  |
[1] | (1) For the years ended December 31 2015, 2014 and 2013, 81%, 80% and 84% of the revenues provided by BP, respectively, were attributable to our Floaters segment.For the year ended December 31, 2015, revenues provided by BP included $110.6 million for the ENSCO DS-4 lump sum termination fee.
[2] | (2) For the years ended December 31, 2015, 2014 and 2013, all Petrobras revenues were attributable to our Floaters segment.

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