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Supplemental Financial Information Revenue from External Customers by Geographic Areas - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member]        
Revenue, Major Customer [Line Items]        
Revenues $ 909,600,000.00 $ 1,059,000,000.00 $ 1,723,600,000.00 $ 2,222,900,000.00
United Kingdom [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member]        
Revenue, Major Customer [Line Items]        
Revenues 69,700,000 104,300,000 143,500,000 224,900,000
US Gulf Of Mexico [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member]        
Revenue, Major Customer [Line Items]        
Revenues $ 304,500,000.00 $ 271,000,000.00 $ 464,700,000.00 $ 609,800,000.00
US Gulf Of Mexico [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member]        
Revenue, Major Customer [Line Items]        
Concentration Risk, Percentage 92.00% 83.00% 89.00% 84.00%
Angola [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member]        
Revenue, Major Customer [Line Items]        
Revenues $ 132,400,000 $ 182,400,000 $ 268,600,000 $ 351,700,000
Angola [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member]        
Revenue, Major Customer [Line Items]        
Concentration Risk, Percentage 88.00% 91.00% 87.00% 90.00%
Brazil [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member] | Floaters [Member]        
Revenue, Major Customer [Line Items]        
Revenues $ 81,700,000 $ 115,700,000 $ 202,700,000 $ 238,400,000
Other Geographic Areas [Member] | Sales Revenue, Services, Net [Member] | Geographic Concentration Risk [Member]        
Revenue, Major Customer [Line Items]        
Revenues $ 321,300,000.00 $ 385,600,000.00 644,100,000.00 $ 798,100,000.00
Sales Revenue, Net [Member]        
Revenue, Major Customer [Line Items]        
Gain (Loss) on Contract Termination     $ 205,000,000