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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 583.9	$ 458.5	$ 989.8	$ 875.5
Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	583.9	458.5	989.8	875.5
US Gulf Of Mexico | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	93.4	59.5	148.1	113.1
SAUDI ARABIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	83.2	39.5	136.6	82.7
AUSTRALIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	70.0	80.4	137.3	132.6
ANGOLA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	68.1	72.2	138.7	133.3
UNITED KINGDOM | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	54.2	53.7	97.6	100.3
BRAZIL | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	25.1	46.1	47.1	96.4
Other | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	189.9	107.1	284.4	217.1
Floaters
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 295.6	$ 284.9	$ 528.3	$ 543.9
Floaters | US Gulf Of Mexico | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	39.00%	36.00%	34.00%	37.00%
Floaters | AUSTRALIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	94.00%	95.00%	94.00%	97.00%
Floaters | ANGOLA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	90.00%	84.00%	88.00%	90.00%
Jackups
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 229.2	$ 158.7	$ 386.2	$ 302.1
Jackups | US Gulf Of Mexico | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	39.00%	39.00%	41.00%
Jackups | SAUDI ARABIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	60.00%		76.00%

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