CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 2,193.7	$ 1,617.8
Marketable securities	1,393.3	1,596.5
Accounts receivable - trade, net	3,111.5	2,100.0
Inventories	1,916.6	1,415.5
Prepaid expenses and other current assets	160.8	273.7
Total current assets	9,779.1	7,689.1
Marketable securities	3,135.6	3,256.8
Property, plant, and equipment, net	3,221.6	2,890.4
Deferred tax assets	858.9	824.2
Other noncurrent assets	168.1	144.7
Total assets	17,163.3	14,805.2
Current liabilities:
Accounts payable	475.5	418.1
Accrued expenses and other current liabilities	1,521.8	1,211.4
Other liabilities - Sanofi	122.4	85.0
Total current liabilities	2,697.4	2,096.6
Long-term debt	1,978.5	0.0
Finance lease liabilities	717.2	713.9
Total liabilities	6,138.0	3,715.5
Commitments and contingencies (Note 10)
Stockholders' equity:
Preferred Stock, $.01 par value; 30,000,000 shares authorized; issued and outstanding - none	0.0	0.0
Additional paid-in capital	6,716.2	4,428.6
Retained earnings	10,893.0	7,379.8
Accumulated other comprehensive income	29.3	21.1
Treasury Stock, at cost; 16,431,520 shares in 2020 and 4,860,123 shares in 2019	(6,613.3)	(739.9)
Total stockholders' equity	11,025.3	11,089.7
Total liabilities and stockholders' equity	17,163.3	14,805.2
Class A Stock
Stockholders' equity:
Common stock	0.0	0.0
Common Stock
Stockholders' equity:
Common stock	0.1	0.1
Total stockholders' equity	0.1	0.1
Sanofi
Current assets:
Accounts receivable	404.7	260.6
Current liabilities:
Deferred revenue, current	341.7	310.5
Deferred revenue, noncurrent	16.7	27.7
Other noncurrent liabilities	189.3	482.0
Other
Current assets:
Accounts receivable	598.5	425.0
Current liabilities:
Deferred revenue, current	236.0	71.6
Deferred revenue, noncurrent	41.1	77.6
Other noncurrent liabilities	$ 497.8	$ 317.7