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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 405.9	$ 417.0
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	405.9	417.0
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | ANGOLA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	70.6	61.1
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	67.3	52.2
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | US Gulf Of Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	54.7	53.6
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | SAUDI ARABIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	53.4	43.2
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	22.0	50.3
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	43.4	46.6
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | Other Geographic Areas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	94.5	110.0
Floaters [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 232.7	$ 259.0
Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | ANGOLA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	86.00%	98.00%
Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	94.00%	100.00%
Floaters [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | US Gulf Of Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	25.00%	38.00%
Jackups Member
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 157.0	$ 143.4
Jackups Member | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member] | US Gulf Of Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	45.00%	34.00%

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