Operations and Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014 country	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2006
Goodwill [Roll Forward]
Goodwill Beginning of Period	$ 1,178.7us-gaap_Goodwill	$ 1,192.4us-gaap_Goodwill	$ 1,194.5us-gaap_Goodwill
Goodwill, Acquired During Period	89.6us-gaap_GoodwillAcquiredDuringPeriod	7.3us-gaap_GoodwillAcquiredDuringPeriod	26.1us-gaap_GoodwillAcquiredDuringPeriod
Impairment charge			(9.1)us-gaap_GoodwillImpairmentLoss	171.4us-gaap_GoodwillImpairmentLoss
Goodwill Adjustments Related To Income Taxes		(8.0)	(7.8)
Goodwill, Foreign Currency Translation	(75.5)us-gaap_GoodwillTranslationAdjustments	(13.0)us-gaap_GoodwillTranslationAdjustments	(11.3)us-gaap_GoodwillTranslationAdjustments
Goodwill End of Period	1,192.8us-gaap_Goodwill	1,178.7us-gaap_Goodwill	1,192.4us-gaap_Goodwill
Amortization of intangibles	41.0us-gaap_AmortizationOfIntangibleAssets	47.8us-gaap_AmortizationOfIntangibleAssets	49.3us-gaap_AmortizationOfIntangibleAssets
Future Amortization Expense
2015	42.7
2016	41.5
2017	41.2
2018	41.2
2019	41.2
Number Of Countries Where Products Sold	140agco_NumberOfCountriesWhereProductsSold
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Beginning Of Period	725.3	723.0
Intangible assets acquired	46.3	6.0
Finite-Lived Intangible Assets, Adjustment	(4.8)
Finite Lived Intangible Assets Foreign Currency Translation	(25.8)	(3.7)
Finite-Lived Intangible Assets, End Of Period	741.0	725.3	723.0
Finite-Lived Intangible Assets, Accumulated Amortization	276.2	253.4	208.1
Finite Lived Intangible Assets, Accumulated Amortization, Foreign Currency Translation	(18.2)	(2.5)
North America
Goodwill [Roll Forward]
Goodwill Beginning of Period	424.0	416.7	415.9
Goodwill, Acquired During Period	89.6	7.3	0.8
Impairment charge			0
Goodwill Adjustments Related To Income Taxes		0	0
Goodwill, Foreign Currency Translation	0	0	0
Goodwill End of Period	513.6	424.0	416.7
South America
Goodwill [Roll Forward]
Goodwill Beginning of Period	190.7	219.3	212.2
Goodwill, Acquired During Period	0	0	29.0
Impairment charge			0
Goodwill Adjustments Related To Income Taxes		0	0
Goodwill, Foreign Currency Translation	(21.0)	(28.6)	(21.9)
Goodwill End of Period	169.7	190.7	219.3
Europe/ Africa/ Middle East
Goodwill [Roll Forward]
Goodwill Beginning of Period	506.6	498.3	496.8
Goodwill, Acquired During Period	0	0	0
Impairment charge			0
Goodwill Adjustments Related To Income Taxes		(8.0)	(7.8)
Goodwill, Foreign Currency Translation	(52.0)	16.3	9.3
Goodwill End of Period	454.6	506.6	498.3
Asia/ Pacific
Goodwill [Roll Forward]
Goodwill Beginning of Period	57.4	58.1	69.6
Goodwill, Acquired During Period	0	0	(3.7)
Impairment charge			(9.1)
Goodwill Adjustments Related To Income Taxes		0	0
Goodwill, Foreign Currency Translation	(2.5)	(0.7)	1.3
Goodwill End of Period	54.9	57.4	58.1
Technology and Patents
Goodwill [Roll Forward]
Finite-Lived Intangible Assets, Useful Life	14 years
Amortization of intangibles	3.2	3.0
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Beginning Of Period	89.1	87.6
Intangible assets acquired	11.3	0
Finite-Lived Intangible Assets, Adjustment	0
Finite Lived Intangible Assets Foreign Currency Translation	(6.4)	1.5
Finite-Lived Intangible Assets, End Of Period	94.0	89.1
Finite-Lived Intangible Assets, Accumulated Amortization	56.1	59.0	54.1
Finite Lived Intangible Assets, Accumulated Amortization, Foreign Currency Translation	(6.1)	1.9
Customer Relationships
Goodwill [Roll Forward]
Finite-Lived Intangible Assets, Useful Life	14 years
Amortization of intangibles	31.4	38.4
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Beginning Of Period	502.7	507.8
Intangible assets acquired	28.0	0
Finite-Lived Intangible Assets, Adjustment	0
Finite Lived Intangible Assets Foreign Currency Translation	(16.9)	(5.1)
Finite-Lived Intangible Assets, End Of Period	513.8	502.7
Finite-Lived Intangible Assets, Accumulated Amortization	180.8	160.7	126.6
Finite Lived Intangible Assets, Accumulated Amortization, Foreign Currency Translation	(11.3)	(4.3)
Land Use Rights
Goodwill [Roll Forward]
Finite-Lived Intangible Assets, Useful Life	46 years
Amortization of intangibles	0.2	0.2
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Beginning Of Period	14.9	8.7
Intangible assets acquired	0	6.0
Finite-Lived Intangible Assets, Adjustment	(4.8)
Finite Lived Intangible Assets Foreign Currency Translation	(0.4)	0.2
Finite-Lived Intangible Assets, End Of Period	9.7	14.9
Finite-Lived Intangible Assets, Accumulated Amortization	2.9	2.7	2.5
Finite Lived Intangible Assets, Accumulated Amortization, Foreign Currency Translation	0	0
Trademarks and Trade Names
Goodwill [Roll Forward]
Finite-Lived Intangible Assets, Useful Life	21 years
Amortization of intangibles	6.2	6.2
Finite-lived Intangible Assets [Roll Forward]
Finite-Lived Intangible Assets, Beginning Of Period	118.6	118.9
Intangible assets acquired	7.0	0
Finite-Lived Intangible Assets, Adjustment	0
Finite Lived Intangible Assets Foreign Currency Translation	(2.1)	(0.3)
Finite-Lived Intangible Assets, End Of Period	123.5	118.6
Finite-Lived Intangible Assets, Accumulated Amortization	36.4	31.0	24.9
Finite Lived Intangible Assets, Accumulated Amortization, Foreign Currency Translation	(0.8)	(0.1)
Trademarks and Trade Names
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite-lived Intangible Assets, Beginning Of Period	93.7	92.2
Indefinite-lived Intangible Assets, Foreign Currency Translation	(4.7)	1.5
Indefinite-lived Intangible Assets, End Of Period	$ 89.0	$ 93.7
Valtra Brand
Future Amortization Expense
Number Of Countries Where Products Sold	50
Minimum
Goodwill [Roll Forward]
Finite-Lived Intangible Asset, Useful Life Range	5 years
Minimum \| Massey Ferguson
Future Amortization Expense
Number Of Countries Where Products Sold	140
Maximum
Goodwill [Roll Forward]
Finite-Lived Intangible Asset, Useful Life Range	50 years

Finite Lived Intangible Assets, Accumulated Amortization, Foreign Currency Translation

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- Definition

Finite-Lived Intangible Assets, Adjustment

+ References

No definition available.

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- Definition

Number of countries where products sold.

+ References

No definition available.

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- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Name Accounting Standards Codification

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

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- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References