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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - Sales Revenue, Services, Net - Geographic Concentration Risk - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 458.5	$ 457.5	$ 875.5	$ 928.6
ANGOLA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	72.2	115.9	133.3	237.6
EGYPT
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	0.0	53.4	31.2	106.6
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	46.1	48.7	96.4	96.5
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	53.7	36.7	100.3	67.9
AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	80.4	55.3	132.6	109.9
US Gulf Of Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	59.5	33.0	113.1	77.3
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 146.6	$ 114.5	$ 268.6	$ 232.8
Floaters | ANGOLA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	84.00%	87.00%	90.00%	86.00%
Floaters | AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	95.00%	78.00%	97.00%	78.00%
Floaters | US Gulf Of Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	36.00%	10.00%		25.00%
Jackups | US Gulf Of Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	39.00%	46.00%		37.00%
Floaters & Jackups [Member] | US Gulf Of Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage			37.00%

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
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