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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.