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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product, net | $ 2,425.9 | $ 2,391.7 | $ 2,198.6 | $ 2,172.3 | $ 2,287.0 | $ 2,117.3 | $ 2,056.3 | $ 1,742.8 | $ 9,188.5 | $ 8,203.4 | $ 5,542.3
Unconsolidated joint business revenues | 333.9 | 337.2 | 337.5 | 330.6 | 304.5 | 290.7 | 303.3 | 296.9 | 1,339.2 | 1,195.4 | 1,126.0
Other | 79.5 | 49.0 | 55.6 | 52.0 | 49.2 | 103.4 | 61.9 | 90.1 | 236.1 | 304.5 | 263.9
Total revenues | 2,839.3 | 2,777.9 | 2,591.6 | 2,555.0 | 2,640.7 | 2,511.4 | 2,421.5 | 2,129.8 | 10,763.8 | 9,703.3 | 6,932.2
Gross Profit | 2,507.5 | 2,467.9 | 2,305.5 | 2,242.6 | 2,343.4 | 2,208.8 | 2,129.6 | 1,850.5 | 9,523.4 | 8,532.3 |
Net income | 828.7 | 1,019.5 | 924.8 | 820.2 | 882.6 | 856.1 | 723.1 | 479.7 | 3,593.2 | 2,941.6 | 1,862.3
Net income attributable to Biogen Idec Inc | $ 831.6 | $ 965.6 | $ 927.3 | $ 822.5 | $ 883.5 | $ 856.9 | $ 714.5 | $ 480.0 | $ 3,547.0 | $ 2,934.8 | $ 1,862.3
Basic earnings per share attributable to Biogen Inc. | $ 3.77 | $ 4.16 | $ 3.94 | $ 3.50 | $ 3.75 | $ 3.63 | $ 3.02 | $ 2.03 | $ 15.38 | $ 12.42 | $ 7.86
Diluted earnings per share attributable to Biogen Inc. | $ 3.77 | $ 4.15 | $ 3.93 | $ 3.49 | $ 3.74 | $ 3.62 | $ 3.01 | $ 2.02 | $ 15.34 | $ 12.37 | $ 7.81
Basic earnings per share attributable to Biogen Inc. | 220.4 | 232.2 | 235.3 | 235.0 | 235.5 | 236.2 | 236.7 | 236.8 | 230.7 | 236.4 | 236.9
Diluted earnings per share attributable to Biogen Inc. | 220.8 | 232.6 | 235.7 | 235.6 | 236.3 | 237.0 | 237.4 | 237.8 | 231.2 | 237.2 | 238.3

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- Definition Revenues from unconsolidated joint business consists of our share of pre-tax co-promotion profits in the U.S.; reimbursement of selling and development expense in the U.S.; and revenue on sales of RITUXAN outside the U.S., which consist of our share of pre-tax co-promotion profits in Canada. + References No definition available. + Details
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