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Revenue from External Customers by Geographic Areas (Details) - Sales Revenue, Services, Net [Member] - Geographic Concentration Risk [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue, Major Customer [Line Items]
Revenues	$ 1,012,200,000.00	$ 1,201,400,000.00	$ 3,235,100,000.00	$ 3,404,700,000.00
United Kingdom [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Revenues	91,500,000	117,800,000	316,400,000	268,700,000
US Gulf Of Mexico [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 363,000,000.00	$ 447,100,000.00	$ 972,800,000.00	$ 1,320,600,000.00
US Gulf Of Mexico [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	90.00%	80.00%	86.00%	78.00%
ANGOLA
Revenue, Major Customer [Line Items]
Revenues	$ 136,600,000	$ 150,100,000	$ 488,300,000	$ 458,500,000
ANGOLA | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	87.00%	100.00%	90.00%	100.00%
Brazil [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 112,900,000	$ 115,800,000	$ 351,300,000	$ 361,500,000
Other Geographic Areas [Member]
Revenue, Major Customer [Line Items]
Revenues	$ 308,200,000.00	$ 370,600,000.00	$ 1,106,300,000.00	$ 995,400,000.00

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



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+ References

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



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-Topic 225



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