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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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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.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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