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Changes in Stockholders' Equity (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, authorized amount	$ 1,050,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 500,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 500,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1	$ 50,000,000.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock repurchased and retired during period	62,500,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Stock repurchase program, outstanding balance authorized to be repurchased	469,200,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Accelerated Share Repurchase [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchased and retired during period	$ 62,500,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = agco_AcceleratedShareRepurchaseMember
Stock repurchased and retired during period, shares	1,290,733us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = agco_AcceleratedShareRepurchaseMember

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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- Definition

Amount of stock repurchase plan authorized.

+ References

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- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

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