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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 | $ 1,050,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 500,000,000.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 500,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 50,000,000.0 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock repurchased and retired during period | 62,500,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue |  |  |
Stock repurchase program, outstanding balance authorized to be repurchased | 469,200,000 us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1 |  |  |
Accelerated Share Repurchase [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock repurchased and retired during period | $ 62,500,000 us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = agco_AcceleratedShareRepurchaseMember |  |  |
Stock repurchased and retired during period, shares | 1,290,733 us-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 + Details
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- Definition 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 + Details
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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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