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Employee Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive loss, before tax, beginning of period $ (279.4)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax $ (355.2)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax  
Accumulated other comprehensive loss, tax, beginning of period (73.0)agco_AccumulatedComprehensiveGainLossDefinedBenefitPlansTax (92.3)agco_AccumulatedComprehensiveGainLossDefinedBenefitPlansTax  
Accumulated other comprehensive loss, after tax, beginning of period (206.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax (262.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax  
Net loss recognized due to settlement, before tax 0.6agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetosettlementbeforetax 0.1agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetosettlementbeforetax  
Net loss recognized due to settlement, tax 0.2agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetosettlementtax 0.1agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetosettlementtax  
Net loss recognized due to settlement 0.4agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetosettlementnetoftax 0agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetosettlementnetoftax 0agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetosettlementnetoftax
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Gain (Loss) due to curtailment, before tax (0.5)agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetocurtailmentbeforetax    
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Gain (Loss) due to curtailment, tax (0.1)agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetocurtailmenttax    
Net gain recognized due to curtailment (0.4)agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetocurtailmentnetoftax 0agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetocurtailmentnetoftax 0agco_OtherComprehensiveIncomeLossPensionandOtherPostretirementBenefitPlansNetGainLossduetocurtailmentnetoftax
Net actuarial gain arising during the year, before tax (72.8)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax 60.1us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax  
Net actuarial gain arising during the year, tax (18.0)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax 14.9us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax  
Net actuarial gain arising during the year, after tax (54.8)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 45.2us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (28.2)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of prior service cost 1.0us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax 1.1us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax  
Amortization of prior service costs, tax 0.4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax 0.5us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax  
Amortization of prior service costs, after tax 0.6us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 0.6us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 0.4us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Amortization of net actuarial loss 9.6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax 14.5us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax  
Amortization of net actuarial loss, tax 2.3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax 3.8us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax  
Amortization of net actuarial losses included in net periodic pension cost 7.3us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 10.7us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 7.6us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Accumulated other comprehensive loss, before tax, end of period (341.5)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax (279.4)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax (355.2)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
Accumulated other comprehensive loss, tax, end of period (88.2)agco_AccumulatedComprehensiveGainLossDefinedBenefitPlansTax (73.0)agco_AccumulatedComprehensiveGainLossDefinedBenefitPlansTax (92.3)agco_AccumulatedComprehensiveGainLossDefinedBenefitPlansTax
Accumulated other comprehensive loss, after tax, end of period $ (253.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ (206.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ (262.9)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax