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

12 Months Ended

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

100.00%

100.00%

100.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

^[1]

13.00%

9.00%

9.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

^[1]

12.00%

18.00%

16.00%

concentration risk, percentage excl termination fees

15.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

^[2]

9.00%

14.00%

9.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

66.00%

59.00%

66.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

76.00%

81.00%

80.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

17.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

7.00%

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

Revenue from External Customer [Line Items]

Gain (Loss) on Contract Termination

$ 110.6

[1]

(1) For the years ended December 31, 2016, 2015 and 2014, all Total revenues were attributable to the Floater segment.(2) For the year ended December 31, 2016, 76%, 17% and 7% of the revenues provided by BP were attributable to our Floaters, Other and Jackups segments, respectively. For the years ended December 31, 2015 and 2014, 81% and 80% of the revenues provided by BP, respectively, were attributable to our Floaters segment and the remaining revenues were attributable to our Other segment.For the year ended December 31, 2015, excluding the impact of ENSCO DS-4 lump-sum termination payments of $110.6 million

[2]

For the years ended December 31, 2016, 2015 and 2014, all Petrobras revenues were attributable to our Floaters segment.

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