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Supplemental Financial Information Supplemental Financial Information (Revenue by region) (Details) - Geographic Concentration Risk [Member] - Sales Revenue, Services, Net [Member] - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues |  | $ 4,063,400,000 | $ 4,564,500,000 | $ 4,323,400,000
Us Gulf Of Mexico [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | [1] | 1,151,500,000 | 1,712,400,000 | 1,687,200,000
Angola [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | [2] | 586,500,000 | 607,900,000 | 365,900,000
Brazil [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | [3] | 468,500,000 | 459,100,000 | 683,700,000
United Kingdom [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | [4] | 400,700,000 | 406,200,000 | 308,400,000
Other Geographic Areas [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues |  | $ 1,456,200,000 | $ 1,378,900,000 | $ 1,278,200,000
Floaters [Member] | Us Gulf Of Mexico [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 86.00% | 79.00% | 77.00%
Floaters [Member] | Angola [Member] |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Concentration Risk, Percentage |  | 88.00% | 100.00% | 96.00%
[1] | For the years ended December 31, 2015, 2014 and 2013, 86%, 79% and 77% of the revenues earned in the U.S. Gulf of Mexico, respectively, were attributable to our Floaters segment.
[2] | For the years ended December 31, 2015, 2014 and 2013, 88%, 100% and 96% of the revenues earned in Angola, respectively, were attributable to our Floaters segment.
[3] | For the years ended December 31, 2015, 2014 and 2013, all revenues were attributable to our Floaters segment.
[4] | For the years ended December 31, 2015, 2014 and 2013, all were revenues attributable to our Jackups segment.

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