Investments in Unconsolidated Affiliates (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investments in Unconsolidated Affiliates (Textual) [Abstract]
Investments in unconsolidated affiliates accounted for using equity method	$ 371.0	$ 265.8
Investments in unconsolidated affiliates accounted for using cost method		1.9	0.9
Assets held for sale include investments in unconsolidated affiliates accounted for using the equity method	13.7	79.5
Earnings (losses) from unconsolidated affiliates included in discontinued operations, net of tax	76.5	(10.6)	(59.2)
Cumulative undistributed (losses) earnings	404.6	(373.9)
Impairment charges for unconsolidated oil and gas joint ventures included in continuing operations	15.6		189.3
Impairment charges for unconsolidated oil and gas joint ventures included in discontinued operations			$ 47.8
Drilling and Workover Operations Located in Saudi Arabia [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment ownership percentage	51.00%
Oil and Gas Exploration Development and Production Joint Ventures in the US and Colombia [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment ownership percentage	49.70%

Cumulative Undistributed earnings of unconsolidated affiliates.

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Impairment charges for unconsolidated oil and gas joint ventures included in continuing operations.

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Impairment charges for unconsolidated oil and gas joint ventures included in discontinued operations.

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Income Loss From Equity Method Investments Attributable to Discontinued Operations.

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Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

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This item represents the aggregate carrying amount of all cost-method investments as reported on or included in the balance sheet. The original cost of the investments may differ from the aggregate carrying amount disclosed due to various adjustments such as: (i) dividends received in excess of earnings after the date of investment that are considered a return of investment and therefore recorded as reductions to cost of the investment, or (ii) a series of operating losses of an investee or other factors which may indicate that a decrease in value of the investment has occurred which is other than temporary and accordingly such decrease in value has been recognized.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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