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Property, Plant and Equipment (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Abstract]    
Land $ 56,900,000us-gaap_Land $ 59,700,000us-gaap_Land
Buildings 947,700,000us-gaap_BuildingsAndImprovementsGross 961,500,000us-gaap_BuildingsAndImprovementsGross
Leasehold improvements 155,500,000us-gaap_LeaseholdImprovementsGross 139,600,000us-gaap_LeaseholdImprovementsGross
Machinery and equipment 1,011,300,000us-gaap_MachineryAndEquipmentGross 944,500,000us-gaap_MachineryAndEquipmentGross
Computer software and hardware 547,800,000biib_ComputerSoftwareAndHardware 559,200,000biib_ComputerSoftwareAndHardware
Furniture and fixtures 64,300,000us-gaap_FurnitureAndFixturesGross 60,300,000us-gaap_FurnitureAndFixturesGross
Construction in progress 168,600,000us-gaap_ConstructionInProgressGross 144,200,000us-gaap_ConstructionInProgressGross
Total cost 2,952,100,000us-gaap_PropertyPlantAndEquipmentGross 2,869,000,000us-gaap_PropertyPlantAndEquipmentGross
Less: accumulated depreciation (1,186,400,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,118,300,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property, plant and equipment, net $ 1,765,683,000us-gaap_PropertyPlantAndEquipmentNet $ 1,750,710,000us-gaap_PropertyPlantAndEquipmentNet