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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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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.

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