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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 285.3	$ 551.3	$ 1,130.7	$ 1,541.1
Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	285.3	551.3	1,130.7	1,541.1
NORWAY | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	53.5	0.2	141.0	9.9
SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	48.5	90.3	189.7	226.9
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	48.0	59.6	153.3	157.2
US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	38.0	83.1	183.3	231.2
AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	18.6	51.6	117.0	189.0
ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	0.2	72.1	63.4	210.8
Other | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
OPERATING REVENUES	$ 78.5	$ 194.4	$ 283.0	$ 516.1
Floaters | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	38.00%	52.00%	56.00%	40.00%
Floaters | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	100.00%		91.00%
Floaters | ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		86.00%	79.00%	87.00%
Jackups | SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	55.00%	58.00%	56.00%	69.00%
Jackups | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	11.00%	22.00%	11.00%	35.00%
Jackups | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage		99.00%		95.00%

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