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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Sales Revenue, Services, Net | Customer Concentration Risk |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00% | 100.00%
Sales Revenue, Services, Net | Customer Concentration Risk | Total S.A. |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 24.00% | 23.00% | 23.00% | 16.00%
Sales Revenue, Services, Net | Customer Concentration Risk | BP |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 15.00% | 13.00% | 15.00% | 12.00%
Sales Revenue, Services, Net | Customer Concentration Risk | Petrobras |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 11.00% | 9.00% | 11.00% | 11.00%
Sales Revenue, Services, Net | Customer Concentration Risk | ConocoPhillips |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 3.00% | 2.00% | 2.00% | 12.00%
Concentration risk excluding termination fee, percentage |  |  |  | 3.00%
Sales Revenue, Services, Net | Customer Concentration Risk | Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 47.00% | 53.00% | 49.00% | 49.00%
Floaters | Sales Revenue, Services, Net | Customer Concentration Risk | BP |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration risk, percentage | 78.00% | 73.00% | 78.00% | 75.00%
Sales Revenue, Net |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (loss) on contract termination |  |  |  | $ 205.0
Sales Revenue, Net | ENSCO DS-9 |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (loss) on contract termination |  |  |  | $ 185.0

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