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

3 Months Ended

12 Months Ended

Jun. 30, 2016

Dec. 31, 2017

Dec. 31, 2016

Dec. 31, 2015

Revenue from External Customer [Line Items]

Gain (Loss) on Contract Termination

$ 205.0

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]

22.00%

13.00%

9.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

^[1]

15.00%

12.00%

18.00%

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]

11.00%

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

52.00%

66.00%

59.00%

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

Revenue from External Customer [Line Items]

Concentration Risk, Percentage

78.00%

76.00%

81.00%

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, 2017, 2016 and 2015, all Total revenues were attributable to the Floater segment.(2) For the years ended December 31, 2017 and 2015, 78% and 81%, respectively, of the revenues provided by BP were attributable to our Floaters segment and the remaining revenues were attributable to our Other segment. 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 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, 2017, 2016 and 2015, all Petrobras revenues were attributable to our Floaters segment.

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