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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Product, net |  | $ 2,502.9 | $ 2,539.6 | $ 2,466.0 | $ 2,309.4 | $ 2,425.9 | $ 2,391.7 | $ 2,198.6 | $ 2,172.3 | $ 9,817.9 | $ 9,188.5 | $ 8,203.4
Revenues from anti-CD20 therapeutic programs |  | 318.2 | 317.6 | 349.2 | 329.5 | 333.9 | 337.2 | 337.5 | 330.6 | 1,314.5 | 1,339.2 | 1,195.4
Other |  | 50.9 | 98.6 | 79.0 | 87.9 | 79.5 | 49.0 | 55.6 | 52.0 | 316.4 | 236.1 | 304.5
Total revenues |  | 2,872.0 | 2,955.8 | 2,894.2 | 2,726.8 | 2,839.3 | 2,777.9 | 2,591.6 | 2,555.0 | 11,448.8 | 10,763.8 | 9,703.3
Gross Profit | [1] | 2,493.5 | 2,538.9 | 2,523.9 | 2,413.8 | 2,507.5 | 2,467.9 | 2,305.5 | 2,242.6 | 9,970.1 | 9,523.4 |
Net income |  | 647.9 | 1,030.2 | 1,048.4 | 969.2 | 828.7 | 1,019.5 | 924.8 | 820.2 | 3,695.7 | 3,593.2 | 2,941.6
Net income attributable to Biogen Idec Inc |  | $ 649.2 | $ 1,032.9 | $ 1,049.8 | $ 970.9 | $ 831.6 | $ 965.6 | $ 927.3 | $ 822.5 | $ 3,702.8 | $ 3,547.0 | $ 2,934.8
Basic earnings per share attributable to Biogen Inc. |  | $ 3.00 | $ 4.72 | $ 4.79 | $ 4.44 | $ 3.77 | $ 4.16 | $ 3.94 | $ 3.50 | $ 16.96 | $ 15.38 | $ 12.42
Diluted earnings per share attributable to Biogen Inc. |  | $ 2.99 | $ 4.71 | $ 4.79 | $ 4.43 | $ 3.77 | $ 4.15 | $ 3.93 | $ 3.49 | $ 16.93 | $ 15.34 | $ 12.37
Basic earnings per share attributable to Biogen Inc. |  | 216.6 | 218.9 | 219.1 | 218.9 | 220.4 | 232.2 | 235.3 | 235.0 | 218.4 | 230.7 | 236.4
Diluted earnings per share attributable to Biogen Inc. |  | 217.0 | 219.4 | 219.4 | 219.3 | 220.8 | 232.6 | 235.7 | 235.6 | 218.8 | 231.2 | 237.2
[1] | (1) Gross profit is calculated as total revenues less cost of sales, excluding amortization of acquired intangible assets.

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- Definition Revenues from anti-CD20 therapeutic programs 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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