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Basis Of Presentation (Details) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2011	Sep. 30, 2010	Sep. 30, 2010	Dec. 31, 2010
Basis Of Presentation [Abstract]
Correction of an immaterial error, increase in cost of goods sold	$ 0.8	$ 0.5	$ 1.3
Correction of an immaterial error, decrease in net income	0.8	0.5	1.3
Correction of an immaterial error, decrease in net income per share diluted	$ 0.01	$ 0.01	$ 0.02
Correction of an immaterial error, decrease in inventory			0.7	0.7
Correction of an immaterial error, increase in accounts payable			1.1	1.1
Correction of an immaterial error, decrease in retained earnings			$ 1.8	$ 1.8