Acquisitions (Summarized Data Of the Result Of Operations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Business Combinations [Abstract]
Net sales	$ 2,305.9	$ 6,874.7
Net income attributable to AGCO Corporation and subsidiaries	$ 102.7	$ 348.8
Net income per common share attributable to AGCO Corporation and subsidiaries:
Basic, in dollars per share	$ 1.07	$ 3.67
Diluted, in dollars per share	$ 1.06	$ 3.56