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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 456.6	$ 405.9
Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	456.6	405.9
US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	78.7	54.7
SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	83.9	53.4
ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	61.5	70.6
UNITED KINGDOM | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	52.5	43.4
AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	26.0	67.3
Other | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 154.0	$ 116.5
Floaters | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	57.00%	25.00%
Floaters | ANGOLA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	82.00%	86.00%
Floaters | AUSTRALIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	59.00%	94.00%
Jackups | US Gulf Of Mexico | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	16.00%	45.00%
Jackups | SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	53.00%
Other | SAUDI ARABIA | Revenue Benchmark [Member] | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	47.00%

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