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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

X

- 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



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+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



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