Changes in Stockholders' Equity (Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ 1,741.0	$ 1,557.7	$ 5,301.8	$ 4,544.8
Interest expense, net	7.0	11.6	38.5	33.6
Income before income taxes and equity in net earnings of affiliates	(85.2)	(67.0)	(233.6)	(178.3)
Income tax provision	23.9	16.9	73.8	64.9
Net income attributable to AGCO Corporation and subsidiaries	(71.1)	(60.7)	(186.8)	(142.1)
Net losses reclassified from accumulated other comprehensive loss into income	3.7	2.6	12.5	10.9
Deferred Net (Losses) Gains on Derivatives
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net losses reclassified from accumulated other comprehensive loss into income			3.7
Reclassification from AOCI, Current Period, Tax			(0.2)
Net losses reclassified from accumulated other comprehensive loss into income			3.5
Amortization of net actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net losses reclassified from accumulated other comprehensive loss into income	3.0	3.2	9.3	9.3
Amortization of prior service cost
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net losses reclassified from accumulated other comprehensive loss into income	0.3	0.3	1.0	1.0
Defined Benefit Pension Plans
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net losses reclassified from accumulated other comprehensive loss into income	3.3	3.5	10.3	10.3
Reclassification from AOCI, Current Period, Tax	(0.4)	(0.4)	(1.3)	(1.4)
Net losses reclassified from accumulated other comprehensive loss into income	2.9	3.1	9.0	8.9
Reclassification out of Accumulated Other Comprehensive Income | Deferred Net (Losses) Gains on Derivatives
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes and equity in net earnings of affiliates	0.9	(0.3)	3.7	2.3
Income tax provision	(0.1)	(0.2)	(0.2)	(0.3)
Net income attributable to AGCO Corporation and subsidiaries	0.8	(0.5)	3.5	2.0
Foreign currency contracts | Reclassification out of Accumulated Other Comprehensive Income | Deferred Net (Losses) Gains on Derivatives
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	0.4	(0.9)	1.9	0.6
Interest rate swap contract | Reclassification out of Accumulated Other Comprehensive Income | Deferred Net (Losses) Gains on Derivatives
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Interest expense, net	$ 0.5	$ 0.6	$ 1.8	$ 1.7