Changes in Stockholders' Equity (Schedule of Stockholders' Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Stockholders' Equity [Line Items]
Balance at beginning of period	$ 3,448.5
Balance at beginning of period	48.4
Balance at beginning of period	3,496.9
Stock compensation	2.4
SSARs exercised	(0.3)
Comprehensive (loss) income:
Net income attributable to AGCO Corporation and subsidiaries	30.1	99.6
Net income (loss)	(0.2)	(0.4)
Net income (loss)	29.9
Other comprehensive (loss) income, net of reclassification adjustments:
Foreign currency translation adjustments	0.1	(0.3)
Foreign currency translation adjustments	(344.1)
Defined benefit pension plans, net of tax	2.2	1.8
Unrealized loss on derivatives, net of tax	(1.6)	1.1
Payments of dividends to stockholders	(10.7)
Repurchase and retirement of shares	(62.5)
Balance at end of period	3,058.4
Balance at end of period	49.4
Balance at end of period	3,107.8
Common Stock [Member]
Schedule of Stockholders' Equity [Line Items]
Balance at beginning of period			0.9
Other comprehensive (loss) income, net of reclassification adjustments:
Balance at end of period	0.9		0.9
Additional Paid-in Capital [Member]
Schedule of Stockholders' Equity [Line Items]
Balance at beginning of period	582.5
Stock compensation	2.4
SSARs exercised	(0.3)
Other comprehensive (loss) income, net of reclassification adjustments:
Repurchase and retirement of shares	(62.5)
Balance at end of period	516.6
Retained Earnings [Member]
Schedule of Stockholders' Equity [Line Items]
Balance at beginning of period	3,771.6
Comprehensive (loss) income:
Net income attributable to AGCO Corporation and subsidiaries	30.1
Other comprehensive (loss) income, net of reclassification adjustments:
Payments of dividends to stockholders	(10.7)
Balance at end of period	3,791.0
Accumulated Other Comprehensive Loss [Member]
Schedule of Stockholders' Equity [Line Items]
Balance at beginning of period	(906.5)
Other comprehensive (loss) income, net of reclassification adjustments:
Foreign currency translation adjustments	(344.2)
Defined benefit pension plans, net of tax	2.2
Unrealized loss on derivatives, net of tax	(1.6)
Balance at end of period	(1,250.1)
Noncontrolling Interests [Member]
Schedule of Stockholders' Equity [Line Items]
Balance at beginning of period	48.4
Comprehensive (loss) income:
Net income (loss)	(0.2)
Other comprehensive (loss) income, net of reclassification adjustments:
Foreign currency translation adjustments	0.1
Changes in noncontrolling interest	1.1
Balance at end of period	49.4
Performance Shares [Member]
Schedule of Stockholders' Equity [Line Items]
Issuance of performance award stock	(5.5)
Performance Shares [Member] | Additional Paid-in Capital [Member]
Schedule of Stockholders' Equity [Line Items]
Issuance of performance award stock	$ (5.5)