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Supplemental Financial Information Supplemental Financial Information (Narrative) (Details) (Sales Revenue, Services, Net [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended |
|---|---|---|
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Jun. 30, 2014
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Jun. 30, 2014
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Customer Concentration Risk [Member] | Total S.A. [Member] | Floaters [Member]
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| Concentration risk, percentage | 11.00% | 13.00% |
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Customer Concentration Risk [Member] | Anadarko Petroleum [Member] | Floaters [Member]
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| Concentration risk, percentage | 10.00% | 10.00% |
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Customer Concentration Risk [Member] | BP [Member]
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| Concentration risk, percentage | 16.00% | 16.00% |
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Customer Concentration Risk [Member] | BP [Member] | Floaters [Member]
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| Concentration risk, percentage | 81.00% | 80.00% |
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Geographic Concentration Risk [Member] | US Gulf Of Mexico [Member]
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| Concentration risk, percentage | 40.00% | 38.00% |
| Revenues | $ 476.1 | $ 896.0 |
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Geographic Concentration Risk [Member] | Angola [Member]
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| Concentration risk, percentage | 17.00% | 17.00% |
| Revenues | 198.8 | 388.1 |
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Geographic Concentration Risk [Member] | Brazil [Member]
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| Revenues | $ 245.7 | |
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Geographic Concentration Risk [Member] | Floaters [Member] | US Gulf Of Mexico [Member]
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| Concentration risk, percentage | 76.00% | 75.00% |
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Geographic Concentration Risk [Member] | Floaters [Member] | Brazil [Member]
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| Concentration risk, percentage | 11.00% |