Acquisitions.

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Business Acquisition Consideration to be Paid Following Settlement of Liabilities and Administrative Formalities.

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Business Acquisitions (Textual) [Abstract].

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Capital lease expiring with renewal option.

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- Definition

Conveyance of undivided interest in assets and related well plugging and abandonment obligations.

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Number of Wells acquired.

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Wholly owned subsidiary investment ownership percentage in lessor.

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Amount of potential cash payments that could result from the contingent consideration arrangement.

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Amount of cash paid to acquire the entity.

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- Definition

Percentage of voting equity interests acquired in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

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The amount of acquisition cost of a business combination allocated to capital lease obligations assumed from the acquired entity.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 98-1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-Subparagraph g

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 53

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The amount of acquisition cost of a business combination allocated to the noncurrent portion of the long-term debt assumed from the acquired entity.

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Acquisitions (Details) (USD $) In Millions, unless otherwise specified					9 Months Ended
	Sep. 30, 2011	Jan. 30, 2010	Sep. 30, 2011 Pressure Pumping Company [Member]	Aug. 30, 2010 Superior Completion Services [Member]	Sep. 30, 2011 Hallin Marine Subsea International Plc [Member]	Dec. 31, 2010 Hallin Marine Subsea International Plc [Member]	Jan. 26, 2010 Hallin Marine Subsea International Plc [Member]	Jan. 30, 2010 Shell Offshore Inc Gulf of Mexico Bullwinkle Platform [Member] Well
Business Acquisitions (Textual) [Abstract]
Cash Paid			$ 0.5	$ 54.3			$ 162.3
Business Acquisition Consideration to be Paid Following Settlement of Liabilities and Administrative Formalities			5.8
Goodwill Amount			3.6
Equity interest acquired			100.00%				100.00%	100.00%
Acquiree debt repaid							55.5
Equity interest in lessor					5.00%
Number of Wells acquired								29
Conveyance of Undivided Interest in Assets and Related Well Plugging and Abandonment Obligations		49.00%						49.00%
Capital lease expiring in 2019					2 years
Other long-term liabilities related to capital lease obligations					30.4	33.0
Acquisitions (Textual) [Abstract]
Maximum additional consideration for acquisitions payable through 2012	$ 4.0