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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	$ 460.2	$ 548.2	$ 1,388.8	$ 2,271.8
ANGOLA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	118.9	142.7	356.5	411.3
EGYPT | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	53.8	50.5	160.4	87.0
BRAZIL | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	51.1	48.6	147.6	251.3
UNITED KINGDOM | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	49.1	60.5	117.0	204.0
AUSTRALIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	48.7	44.6	158.6	169.4
US Gulf Of Mexico | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	34.9	33.6	112.2	498.3
Other | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenues	$ 103.7	$ 167.7	$ 336.5	$ 650.5
Floaters | ANGOLA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk, percentage	85.00%	87.00%	86.00%	87.00%
Floaters | AUSTRALIA | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk, percentage	92.00%		83.00%
Floaters | US Gulf Of Mexico | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk, percentage	21.00%	41.00%	24.00%	86.00%
Jackups | US Gulf Of Mexico | Sales Revenue, Services, Net | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk, percentage	35.00%	14.00%	37.00%	5.00%
Sales Revenue, Net
Revenue, Major Customer [Line Items]
Gain (loss) on contract termination				$ 205.0

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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