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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Product, net |  | $ 2,712.4 | $ 2,622.5 | $ 2,639.7 | $ 2,380.1 | $ 2,502.9 | $ 2,539.6 | $ 2,466.0 | $ 2,309.4 | $ 10,354.7 | $ 9,817.9 | $ 9,188.5
Revenues from anti-CD20 therapeutic programs |  | 415.0 | 406.5 | 397.1 | 340.6 | 318.2 | 317.6 | 349.2 | 329.5 | 1,559.2 | 1,314.5 | 1,339.2
Other |  | 179.6 | 48.8 | 41.6 | 90.0 | 50.9 | 98.6 | 79.0 | 87.9 | 360.0 | 316.4 | 236.1
Total revenues |  | 3,307.0 | 3,077.8 | 3,078.4 | 2,810.7 | 2,872.0 | 2,955.8 | 2,894.2 | 2,726.8 | 12,273.9 | 11,448.8 | 10,763.8
Gross Profit | [1] | 2,797.8 | 2,707.8 | 2,712.2 | 2,426.1 | 2,493.5 | 2,538.9 | 2,523.9 | 2,413.8 | 10,643.9 | 9,970.1 |
Net income |  | (166.3) | 1,226.1 | 862.8 | 747.5 | 647.9 | 1,030.2 | 1,048.4 | 969.2 | 2,670.1 | 3,695.7 | 3,593.2
Net income attributable to Biogen Idec Inc |  | $ (297.4) | $ 1,226.1 | $ 862.8 | $ 747.6 | $ 649.2 | $ 1,032.9 | $ 1,049.8 | $ 970.9 | $ 2,539.1 | $ 3,702.8 | $ 3,547.0
Basic earnings per share attributable to Biogen Inc. |  | $ (1.41) | $ 5.80 | $ 4.07 | $ 3.47 | $ 3.00 | $ 4.72 | $ 4.79 | $ 4.44 | $ 11.94 | $ 16.96 | $ 15.38
Diluted earnings per share attributable to Biogen Inc. |  | $ (1.40) | $ 5.79 | $ 4.07 | $ 3.46 | $ 2.99 | $ 4.71 | $ 4.79 | $ 4.43 | $ 11.92 | $ 16.93 | $ 15.34
Basic earnings per share attributable to Biogen Inc. |  | 211.5 | 211.4 | 211.9 | 215.6 | 216.6 | 218.9 | 219.1 | 218.9 | 212.6 | 218.4 | 230.7
Diluted earnings per share attributable to Biogen Inc. |  | 212.0 | 211.8 | 212.2 | 215.9 | 217.0 | 219.4 | 219.4 | 219.3 | 213.0 | 218.8 | 231.2
[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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