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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
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] | ConocoPhillips [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	3.00%		4.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | ConocoPhillips [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	23.00%	3.00%	15.00%	3.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Petrobras [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	9.00%	15.00%	12.00%	13.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Total S.A. [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	13.00%	10.00%	14.00%	9.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | BP [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	10.00%	16.00%	12.00%	14.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | BP [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	75.00%	79.00%	76.00%	82.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Other Customers [Member] | Floaters [Member]
Revenue, Major Customer [Line Items]
Concentration Risk, Percentage	45.00%	56.00%	47.00%	61.00%
Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Gain (Loss) on Contract Termination			$ 205.0
ENSCO DS-9 [Member] | Sales Revenue, Net [Member]
Revenue, Major Customer [Line Items]
Gain (Loss) on Contract Termination			$ 185.0

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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.

+ References

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

+ References

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