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Supplemental Financial Information Supplemental Financial Information (Major Customers) (Details) - USD ($)

12 Months Ended

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

100.00%

100.00%

100.00%

BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

^[1]

18.00%

16.00%

10.00%

Petrobras [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

^[2]

14.00%

9.00%

14.00%

Other Customers [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

68.00%

75.00%

76.00%

Floaters [Member] | BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

80.00%

84.00%

81.00%

Sales Revenue, Net [Member] | Ensco DS-4 [Member]

Revenue from External Customer [Line Items]

Gain (Loss) on Contract Termination

$ 110,600,000.0

[1]	(1) For the years ended December 31 2015, 2014 and 2013, 81%, 80% and 84% of the revenues provided by BP, respectively, were attributable to our Floaters segment.For the year ended December 31, 2015, revenues provided by BP included $110.6 million for the ENSCO DS-4 lump sum termination fee.
[2]	(2) For the years ended December 31, 2015, 2014 and 2013, all Petrobras revenues were attributable to our Floaters segment.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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