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Correction of Errors in Previously Reported Financial Statements, (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Correction of Error in Previously Reported Financial Statement (Textual) [Abstract]
Decrease to net income	$ 0.7	$ 1.4	$ 3.0
Reduction in total comprehensive income	0.2	1.2	3.0
Losses in foreign currency translation	0.5	0.2
Reduction in retained earnings				$ 0.8

Net of tax adjustment in the annual report for the year in which a restatement is made, of the resulting effects on the net income of prior periods on the beginning balance of retained earnings for the current period.

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