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Supplemental Financial Information Supplemental Financial Information (Major Customers) (Details)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Document Period End Date		Dec. 31, 2019
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		100.00%	100.00%	100.00%
TOTAL [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	[1]	16.00%	15.00%	22.00%
Saudi Aramco [Member] [Domain] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		7.00%	11.00%	9.00%
Petrobras [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		4.00%	8.00%	11.00%
BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	[1]	9.00%	7.00%	15.00%
Other Customers [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		64.00%	59.00%	43.00%
Floaters [Member] | TOTAL [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		93.00%
Floaters [Member] | BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		16.00%	27.00%	78.00%
Other Rigs [Member] | BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		43.00%	53.00%
Jackups Member | BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member] (Deprecated 2019-01-31)
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		41.00%	20.00%
[1] For the years ended December 31, 2019, 93% of revenues provided by Total were attributable to the Floaters segment and the remainder was attributable to the Jackup segment. During the years 2018 and 2017, all Total revenues were attributable to the Floater segment.

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