Supplemental Financial Information Supplemental Financial Information (Narrative) (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Proceeds from Sale of Property, Plant, and Equipment				$ 1,200,000
Customer Concentration Risk [Member] \| Sales Revenue, Services, Net [Member] \| Floaters [Member]
Concentration Risk, Percentage	100.00%	100.00%	100.00%	100.00%
Customer Concentration Risk [Member] \| Total S.A. [Member] \| Sales Revenue, Services, Net [Member] \| Floaters [Member]
Concentration Risk, Percentage	13.00%	10.00%	14.00%	9.00%
Customer Concentration Risk [Member] \| BP [Member] \| Sales Revenue, Services, Net [Member]
Concentration Risk, Percentage	10.00%	16.00%	12.00%	14.00%
Customer Concentration Risk [Member] \| BP [Member] \| Sales Revenue, Services, Net [Member] \| Floaters [Member]
Concentration Risk, Percentage	75.00%	79.00%	76.00%	82.00%
Geographic Concentration Risk [Member] \| Sales Revenue, Services, Net [Member]
Revenues	$ 909,600,000.00	$ 1,059,000,000.00	$ 1,723,600,000.00	$ 2,222,900,000.00
Geographic Concentration Risk [Member] \| Sales Revenue, Services, Net [Member] \| US Gulf Of Mexico [Member]
Revenues	304,500,000.00	271,000,000.00	464,700,000.00	609,800,000.00
Geographic Concentration Risk [Member] \| Sales Revenue, Services, Net [Member] \| Angola [Member]
Revenues	$ 132,400,000	$ 182,400,000	$ 268,600,000	$ 351,700,000
Geographic Concentration Risk [Member] \| Sales Revenue, Services, Net [Member] \| Floaters [Member] \| US Gulf Of Mexico [Member]
Concentration Risk, Percentage	92.00%	83.00%	89.00%	84.00%
Geographic Concentration Risk [Member] \| Sales Revenue, Services, Net [Member] \| Floaters [Member] \| Angola [Member]
Concentration Risk, Percentage	88.00%	91.00%	87.00%	90.00%
Geographic Concentration Risk [Member] \| Sales Revenue, Services, Net [Member] \| Floaters [Member] \| Brazil [Member]
Revenues	$ 81,700,000	$ 115,700,000	$ 202,700,000	$ 238,400,000

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.

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=64851502&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=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Section 50
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
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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).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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