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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 551.3	$ 430.9	$ 1,541.1	$ 1,306.4
Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	551.3	430.9	1,541.1	1,306.4
Geographic Concentration Risk | US Gulf Of Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	83.1	59.3	231.2	172.4
Geographic Concentration Risk | SAUDI ARABIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	90.3	49.0	226.9	131.8
Geographic Concentration Risk | AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	51.6	75.1	189.0	207.7
Geographic Concentration Risk | ANGOLA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	72.1	76.2	210.8	209.5
Geographic Concentration Risk | UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	59.6	55.4	157.2	155.7
Geographic Concentration Risk | Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 194.6	$ 115.9	$ 526.0	$ 429.3
Jackups | Geographic Concentration Risk | US Gulf Of Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	22.00%	39.00%	35.00%	38.00%
Jackups | Geographic Concentration Risk | SAUDI ARABIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	58.00%		69.00%
Floaters | Geographic Concentration Risk | US Gulf Of Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	52.00%	35.00%	40.00%	36.00%
Floaters | Geographic Concentration Risk | AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	99.00%	87.00%	95.00%	94.00%
Floaters | Geographic Concentration Risk | ANGOLA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	86.00%	82.00%		87.00%

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