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Operations and Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share, Basic [Abstract]      
Net income attributable to AGCO Corporation and subsidiaries $ 186.4 $ 160.1 $ 266.4
Weighted average number of common shares outstanding (in shares) 79.5 81.4 87.0
Basic net income per share attributable to AGCO Corporation and subsidiaries (in dollars per share) $ 2.34 $ 1.97 $ 3.06
Diluted net income per share:      
Dilutive SSARs, performance share awards and restricted stock units (in shares) 0.7 0.3 0.1
Weighted average number of common shares and common share equivalents outstanding for purposes of computing diluted net income per share (in shares) 80.2 81.7 87.1
Diluted net income per share attributable to AGCO Corporation and subsidiaries (in dollars per share) $ 2.32 $ 1.96 $ 3.06
Stock Appreciation Rights (SARs)      
Diluted net income per share:      
Antidilutive securities excluded from computation of earnings per share (in shares) 0.3 1.1 1.2