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Supplemental Financial Information (Narrative) (Details) - Sales Revenue, Services, Net [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Customer Concentration Risk [Member] | Floaters [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk [Member] | Total S.A. [Member] | Floaters [Member]
Concentration Risk, Percentage	6.00%	8.00%	8.00%	10.00%
Customer Concentration Risk [Member] | BP [Member]
Concentration Risk, Percentage	27.00%	15.00%	18.00%	16.00%
Customer Concentration Risk [Member] | BP [Member] | Floaters [Member]
Concentration Risk, Percentage	86.00%	79.00%	84.00%	80.00%
Geographic Concentration Risk [Member]
Revenues	$ 1,012,200,000.00	$ 1,201,400,000.00	$ 3,235,100,000.00	$ 3,404,700,000.00
Geographic Concentration Risk [Member] | US Gulf Of Mexico [Member]
Revenues	363,000,000.00	447,100,000.00	972,800,000.00	1,320,600,000.00
Geographic Concentration Risk [Member] | ANGOLA
Revenues	$ 136,600,000	$ 150,100,000	$ 488,300,000	$ 458,500,000
Geographic Concentration Risk [Member] | Floaters [Member] | US Gulf Of Mexico [Member]
Concentration Risk, Percentage	90.00%	80.00%	86.00%	78.00%
Geographic Concentration Risk [Member] | Floaters [Member] | ANGOLA
Concentration Risk, Percentage	87.00%	100.00%	90.00%	100.00%
Geographic Concentration Risk [Member] | Floaters [Member] | Brazil [Member]
Revenues	$ 112,900,000	$ 115,800,000	$ 351,300,000	$ 361,500,000

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



-Section 50



-Paragraph 18



-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592



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Reference 4: http://www.xbrl.org/2003/role/presentationRef



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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



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