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Supplemental Financial Information Revenue from External Customers by Geographic Areas (Details) - Geographic Concentration Risk [Member] - Sales Revenue, Services, Net [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 417.0	$ 471.1
ANGOLA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	61.1	121.7
US Gulf Of Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	53.6	44.3
AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	52.2	54.6
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	50.3	47.8
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	46.6	31.2
SAUDI ARABIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	43.2	41.3
EGYPT
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	31.0	53.2
Other Geographic Areas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 79.0	$ 77.0
Floaters [Member] | ANGOLA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	98.00%	86.00%
Floaters [Member] | US Gulf Of Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	38.00%	37.00%
Floaters [Member] | AUSTRALIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	100.00%	78.00%
Jackups Member | US Gulf Of Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration Risk, Percentage	34.00%	30.00%

X

- 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
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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- Definition

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
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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