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Schedule of Revenue by Major Customers, by Reporting Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 100.00% | 100.00% | 100.00% | 100.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Petrobras [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 16.00% | 10.00% | 14.00% | 10.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Total S.A. [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 6.00% | 8.00% | 8.00% | 10.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Anadarko [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 1.00% | 8.00% | 4.00% | 10.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | BP [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 27.00% | 15.00% | 18.00% | 16.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | BP [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 86.00% | 79.00% | 84.00% | 80.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Other Customers [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 50.00% | 59.00% | 56.00% | 54.00%
ANGOLA | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 87.00% | 100.00% | 90.00% | 100.00%
US Gulf Of Mexico [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 90.00% | 80.00% | 86.00% | 78.00%
Ensco DS-4 [Member] | Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  | $ 110.6 |

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