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Supplemental Financial Information Supplemental Financial Information (Revenue by region) (Details) - Geographic Concentration Risk [Member] - Sales Revenue, Services, Net [Member] - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

$ 2,776.4

$ 4,063.4

$ 4,564.5

Us Gulf Of Mexico [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[1]

$ 531.7

$ 1,151.5

$ 1,712.4

Us Gulf Of Mexico [Member] | Floaters [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

82.00%

86.00%

79.00%

Us Gulf Of Mexico [Member] | Jackups Member

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

7.00%

9.00%

18.00%

Angola [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[2]

$ 552.1

$ 586.5

$ 607.9

Angola [Member] | Floaters [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Concentration Risk, Percentage

87.00%

88.00%

100.00%

Brazil [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[3]

$ 298.0

$ 468.5

$ 459.1

United Kingdom [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

^[4]

246.2

400.7

406.2

Other Geographic Areas [Member]

Segment Reporting, Revenue Reconciling Item [Line Items]

Revenues

$ 1,148.4

$ 1,456.2

$ 1,378.9

[1]	(2) For the years ended December 31, 2016, 2015 and 2014, 82%, 86% and 79% of the revenues earned in the U.S. Gulf of Mexico, respectively, were attributable to our Floaters segment. For the years ended December 31, 2016, 2015 and 2014, 7%, 9% and 18% of revenues were attributable to our Jackups segment.
[2]	(1) For the years ended December 31, 2016, 2015 and 2014, 87%, 88% and 100% of the revenues earned in Angola, respectively, were attributable to our Floaters segment with the remaining revenues attributable to our Jackups segment.
[3]	(3) For the years ended December 31, 2016, 2015 and 2014, all revenues were attributable to our Floaters segment.
[4]	4) For the years ended December 31, 2016, 2015 and 2014, all revenues were attributable to our Jackups segment.

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- Definition

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+ 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=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
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=64851502&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
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-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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+ 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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