Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Basic net income per share:
Net income attributable to AGCO Corporation and subsidiaries	$ 65.1	$ 24.3
Weighted average number of common shares outstanding, shares	76.6	79.6
Basic net income per share attributable to AGCO Corporation and subsidiaries, dollars per share	$ 0.85	$ 0.31
Diluted net income per share:
Dilutive SSARs, performance share awards and RSUs	0.9	0.9
Weighted average number of common shares and common share equivalents outstanding for purposes of computing diluted income per share, shares	77.5	80.5
Diluted net income per share attributable to AGCO Corporation and subsidiaries, dollars per share	$ 0.84	$ 0.30
Stock-Settled Appreciation Rights
Diluted net income per share:
SSARs excluded from earnings per share computation, shares	0.7	0.4