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Supplemental Financial Information Schedule of Revenue by Major Customers, by Reporting Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Floaters [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 | 3.00% |  | 4.00% |
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | ConocoPhillips [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 23.00% | 3.00% | 15.00% | 3.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Petrobras [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 9.00% | 15.00% | 12.00% | 13.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Total S.A. [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 13.00% | 10.00% | 14.00% | 9.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | BP [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 10.00% | 16.00% | 12.00% | 14.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | BP [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 75.00% | 79.00% | 76.00% | 82.00%
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Other Customers [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 45.00% | 56.00% | 47.00% | 61.00%
Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  | $ 205.0 |
ENSCO DS-9 [Member] | Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  | $ 185.0 |

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