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Percentage of voting equity interests acquired in the business combination.

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Amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable, which is expected to be collected within a year within one year (or one operating cycle, if longer) from the date of the balance sheet.

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Long-Term Contracts (Details) (USD $) In Millions, unless otherwise specified						1 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Jan. 30, 2010	Jan. 30, 2010 Shell Offshore Inc. Gulf of Mexico Bullwinkle Platform [Member]	Mar. 31, 2011 Dynamic Offshore [Member]	Dec. 31, 2007 Wild Well [Member] Well	Sep. 30, 2011 Wild Well [Member]	Dec. 31, 2010 Wild Well [Member]	Jan. 30, 2010 Wild Well [Member]
Long-Term Contracts (Textual) [Abstract]
Percentage of ownership acquired by Wild Well in Shell Offshore Inc.'s Gulf of Mexico Bullwinkle platform				100.00%
Conveyance of Undivided Interest in Assets and Related Well Plugging and Abandonment Obligations			49.00%
Performance bonds required to be obtained by Wild Well									$ 50.0
Amounts to be funded in Escrow account by Wild Well									50.0
Escrowed cash included in intangible and other long-term assets, net							50.2	33.0
Deferred revenue included in other long-term liabilities							24.6	16.2
Equity-method ownership percentage					10.00%
Contractual arrangements fixed sum						750
Number of downed oil and gas platforms and related well facilities decommissioned						7
Costs and estimated earnings in excess of billings included in other current assets	$ 133.8	$ 146.9					$ 129.7	$ 144.5