Acquisitions (Summarized Data Of the Result Of Operations) (Details) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net sales	$ 2,099.1	$ 1,657.4	$ 6,255.4	$ 4,728.6
Net income attributable to AGCO Corporation and subsidiaries	84.4	62.3	298.1	135.3
Basic net income per common share attributable to AGCO Corporation and subsidiaries	$ 0.88	$ 0.67	$ 3.13	$ 1.46
Diluted net income per common share attributable to AGCO Corporation and subsidiaries	$ 0.87	$ 0.65	$ 3.04	$ 1.41
AGCO Corporation And Subsidiaries [Member]
Net sales		1,723.1	6,289.0	4,955.5
Net income attributable to AGCO Corporation and subsidiaries		$ 65.8	$ 298.5	$ 144.5
Basic net income per common share attributable to AGCO Corporation and subsidiaries		$ 0.71	$ 3.14	$ 1.56
Diluted net income per common share attributable to AGCO Corporation and subsidiaries		$ 0.69	$ 3.05	$ 1.51