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Operations and Summary of Significant Accounting Policies - Summary of Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share, Basic [Abstract]      
Net income attributable to AGCO Corporation and subsidiaries $ 427.1 $ 125.2 $ 285.5
Weighted average number of common shares outstanding (in shares) 75.0 76.2 78.8
Basic net income per share attributable to AGCO Corporation and subsidiaries (in dollars per share) $ 5.69 $ 1.64 $ 3.62
Diluted net income per share:      
Dilutive SSARs, performance share awards and restricted stock units (in shares) 0.6 0.8 0.9
Weighted average number of common shares and common share equivalents outstanding for purposes of computing diluted net income per share (in shares) 75.6 77.0 79.7
Diluted net income per share attributable to AGCO Corporation and subsidiaries (in dollars per share) $ 5.65 $ 1.63 $ 3.58