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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [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 |  | 5.00% | 3.00% | 3.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | ConocoPhillips [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 2.00% | 6.00% | 12.00% | 4.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Petrobras [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 9.00% | 16.00% | 11.00% | 14.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Total S.A. [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 23.00% | 7.00% | 16.00% | 8.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | BP [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
concentration risk, percentage excl termination fees |  | 18.00% |  | 15.00%
Concentration Risk, Percentage | 13.00% | 27.00% | 12.00% | 18.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | BP [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 73.00% | 86.00% | 75.00% | 84.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Other Customers [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 53.00% | 44.00% | 49.00% | 56.00%
Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  | $ 205.0 | $ 129.0
ENSCO DS-4 [Member] | Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  |  | 110.6
ENSCO DS-9 [Member] | Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  | $ 185.0 | $ 18.4

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