Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,386.7	$ 1,573.8
Marketable securities	2,041.7	2,115.2
Accounts receivable, net	2,017.3	1,787.0
Due from anti-CD20 therapeutic programs	508.4	532.6
Inventory	916.6	902.7
Other current assets	848.3	962.0
Total current assets	8,719.0	7,873.3
Marketable securities	1,244.5	3,057.3
Property, plant and equipment, net	3,538.9	3,182.4
Intangible assets, net	3,379.0	3,879.6
Goodwill	5,440.1	4,632.5
Deferred tax assets	2,160.9	595.9
Investments and other assets	1,009.8	431.6
Total assets	25,492.2	23,652.6
Current liabilities:
Current portion of notes payable	0.0	3.2
Taxes payable	254.1	68.2
Accounts payable	342.3	395.5
Accrued expenses and other	2,578.5	2,901.3
Total current liabilities	3,174.9	3,368.2
Notes payable	5,931.1	5,935.0
Deferred tax liabilities	1,114.6	122.6
Other long-term liabilities	1,511.8	1,628.7
Total liabilities	11,732.4	11,054.5
Commitments and contingencies
Biogen Idec Inc. shareholders' equity
Preferred stock, par value $0.001 per share	0.0	0.0
Common stock, par value $0.0005 per share	0.1	0.1
Additional paid-in capital	47.8	97.8
Accumulated other comprehensive loss	(248.3)	(318.4)
Retained earnings	16,944.1	15,810.4
Treasury stock, at cost	(2,977.1)	(2,977.1)
Total Biogen Inc. shareholders’ equity	13,766.6	12,612.8
Noncontrolling interests	(6.8)	(14.7)
Total equity	13,759.8	12,598.1
Total liabilities and equity	$ 25,492.2	$ 23,652.6