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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 430.9	$ 460.2	$ 1,306.4	$ 1,388.8
Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	430.9	460.2	1,306.4	1,388.8
ANGOLA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	76.2	118.9	209.5	356.5
EGYPT | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0.0	53.8	31.2	160.4
BRAZIL | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	22.1	51.1	118.5	147.6
UNITED KINGDOM | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	55.4	49.1	155.7	117.0
SAUDI ARABIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	49.0	44.2	131.8	127.4
AUSTRALIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	75.1	48.7	207.7	158.6
US Gulf Of Mexico | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	59.3	34.9	172.4	112.2
Other | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	93.8	59.5	279.6	209.1
Floaters
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 241.8	$ 291.9	$ 785.7	$ 840.7
Floaters | ANGOLA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	82.00%	85.00%	87.00%	86.00%
Floaters | AUSTRALIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	87.00%	92.00%	94.00%	83.00%
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	35.00%	21.00%	36.00%	24.00%
Jackups
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 173.3	$ 153.1	$ 475.4	$ 503.8
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%	35.00%	38.00%	37.00%

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