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Supplemental Financial Information Supplemental Financial Information (Revenue by region) (Details) - Geographic Concentration Risk [Member] - Sales Revenue, Services, Net [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues $ 1,843.0 $ 2,776.4 $ 4,063.4
Angola [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues [1] $ 445.7 $ 552.1 $ 586.5
Angola [Member] | Floaters [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Concentration Risk, Percentage 88.00% 87.00% 88.00%
EGYPT      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues [1] $ 214.8 $ 141.2 $ 0.0
AUSTRALIA      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues [1] $ 206.7 $ 222.8 $ 223.2
AUSTRALIA | Floaters [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Concentration Risk, Percentage 87.00% 95.00% 100.00%
Brazil [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues [2] $ 196.2 $ 298.0 $ 468.5
SAUDI ARABIA      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues [1] 171.8 210.6 255.2
United Kingdom [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues [3] 164.6 246.2 400.7
Us Gulf Of Mexico [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues [4] $ 149.8 $ 531.7 $ 1,151.5
Us Gulf Of Mexico [Member] | Floaters [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Concentration Risk, Percentage 29.00% 82.00% 86.00%
Us Gulf Of Mexico [Member] | Jackups Member      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Concentration Risk, Percentage 31.00% 7.00% 9.00%
Other Geographic Areas [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenues $ 293.4 $ 573.8 $ 977.8
[1] (1) For the years ended December 31, 2017, 2016 and 2015, 88%, 87% and 88% of the revenues earned in Angola, respectively, were attributable to our Floaters segment with the remaining revenues attributable to our Jackups segment.
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[3] 5) For the years ended December 31, 2017, 2016 and 2015, 29%, 82% and 86% of the revenues earned in the U.S. Gulf of Mexico, respectively, were attributable to our Floaters segment. For the years ended December 31, 2017, 2016 and 2015, 31%, 7% and 9% of revenues were attributable to our Jackups segment.
[4] (2) For the years ended December 31, 2017, 2016 and 2015, all revenues were attributable to our Floaters segment.(3) For the years ended December 31, 2017, 2016 and 2015, 87%, 95% and 100% of the revenues earned in Australia, respectively, were attributable to our Floaters segment with the remaining revenues attributable to our Jackups segment.(4) For the years ended December 31, 2017, 2016 and 2015, all revenues were attributable to our Jackups segment.(5) For the years ended December 31, 2017, 2016 and 2015, 29%, 82% and 86% of the revenues earned in the U.S. Gulf of Mexico, respectively, were attributable to our Floaters segment. For the years ended December 31, 2017, 2016 and 2015, 31%, 7% and 9% of revenues were attributable to our Jackups segment.