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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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Stockholders' Equity and Earnings Per Share (Narrative) (Details) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2011 USD ($)	Jun. 30, 2011 CNY	Nov. 30, 2008	Apr. 20, 2011 Shanghai CompAir Compressor Co. Ltd. [Member]	Apr. 20, 2011 Shanghai CompAir-Dalong High Pressure Equipment Co. Ltd. [Member]
Share repurchased, authorized			3,000,000
Stock repurchased during period, shares	72,000
Stock repurchased during period value	$ 5.3
Equity Method Investment, Ownership Percentage				49.00%	40.00%
Purchase price	$ 18.8	122.0