Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 2,243.2	$ 1,224.6
Marketable securities	1,665.8	2,313.4
Accounts receivable, net	2,088.9	1,958.5
Due from anti-CD20 therapeutic programs	527.1	526.9
Inventory	770.2	929.9
Assets held for sale	682.0	0.0
Other current assets	965.4	687.6
Total current assets	8,942.6	7,640.9
Marketable securities	1,372.7	1,375.9
Property, plant and equipment, net	3,013.8	3,601.2
Operating lease assets	447.8	0.0
Intangible assets, net	3,056.2	3,120.0
Goodwill	5,639.7	5,706.4
Deferred tax asset	2,074.4	2,153.9
Investments and other assets	1,898.3	1,690.6
Total assets	26,445.5	25,288.9
Current liabilities:
Taxes payable	238.5	63.5
Accounts payable	378.0	370.5
Liabilities held for sale	97.2	0.0
Accrued expenses and other	2,435.0	2,861.2
Total current liabilities	3,148.7	3,295.2
Notes payable	5,943.2	5,936.5
Deferred tax liability	1,741.7	1,636.2
Long-term operating lease liabilities	436.1	0.0
Other long-term liabilities	1,353.8	1,389.4
Total liabilities	12,623.5	12,257.3
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	0.0	0.0
Accumulated other comprehensive loss	(219.8)	(240.4)
Retained earnings	17,026.7	16,257.0
Treasury stock, at cost	(2,977.1)	(2,977.1)
Total Biogen Inc. shareholders’ equity	13,829.9	13,039.6
Noncontrolling interests	(7.9)	(8.0)
Total equity	13,822.0	13,031.6
Total liabilities and equity	$ 26,445.5	$ 25,288.9