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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationNoncurrentLiabilitiesLongTermDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Acquisitions (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011	Aug. 30, 2010 Superior Completion Services [Member]	Jan. 26, 2010 Hallin Marine Subsea International Plc [Member]	Jan. 30, 2010 Shell Offshore Inc Gulf of Mexico Bullwinkle Platform [Member]
Business Acquisition (Textuals) [Abstract]
Cash paid for acquisition		$ 54.3	$ 162.3
Percentage of ownership acquired by Wild Well in Shell Offshore Inc.'s Gulf of Mexico Bullwinkle platform			100.00%	100.00%
Acquiree debt repaid			55.5
Number of Wells acquired				29
Conveyance of Undivided Interest in Acquired Assets				49.00%
Acquisitions (Textuals) [Abstract]
Maximum additional consideration for acquisitions payable through 2012	$ 4.0