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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) | 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] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 548,200,000.00 | $ 1,012,200,000.00 | $ 2,271,800,000.00 | $ 3,235,100,000.00
United Kingdom [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 60,500,000 | 91,500,000 | 204,000,000 | 316,400,000
US Gulf Of Mexico [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 33,600,000.00 | $ 363,000,000.00 | $ 498,300,000.00 | $ 972,800,000.00
US Gulf Of Mexico [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 41.00% | 90.00% | 86.00% | 86.00%
Angola [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 142,700,000 | $ 136,600,000 | $ 411,300,000 | $ 488,300,000
Angola [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 87.00% | 87.00% | 87.00% | 90.00%
Brazil [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 48,600,000 | $ 112,900,000 | $ 251,300,000 | $ 351,300,000
Other Geographic Areas [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 262,800,000.00 | $ 308,200,000.00 | 906,900,000.00 | 1,106,300,000.00
Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  | $ 205,000,000 | $ 129,000,000
ConocoPhillips [Member] | Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 5.00% | 3.00% | 3.00%
ConocoPhillips [Member] | Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Floaters [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Concentration Risk, Percentage | 2.00% | 6.00% | 12.00% | 4.00%
ENSCO DS-9 [Member] | Sales Revenue, Net [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  |  | $ 185,000,000 | $ 18,400,000

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