CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 1,437.9	$ 2,193.7
Marketable securities	2,065.9	1,393.3
Accounts receivable, net	4,173.0	4,114.7
Inventories	2,164.7	1,916.6
Prepaid expenses and other current assets	213.6	160.8
Total current assets	10,055.1	9,779.1
Marketable securities	3,543.7	3,135.6
Property, plant, and equipment, net	3,262.6	3,221.6
Deferred tax assets	765.1	858.9
Other noncurrent assets	145.7	168.1
Total assets	17,772.2	17,163.3
Current liabilities:
Accounts payable	542.9	475.5
Accrued expenses and other current liabilities	1,492.2	1,644.2
Finance lease liabilities	717.8	0.0
Deferred revenue	464.9	577.7
Total current liabilities	3,217.8	2,697.4
Long-term debt	1,978.9	1,978.5
Finance lease liabilities	0.0	717.2
Deferred revenue	27.0	57.8
Other noncurrent liabilities	571.5	687.1
Total liabilities	5,795.2	6,138.0
Stockholders' equity:
Preferred Stock, $.01 par value; 30,000,000 shares authorized; issued and outstanding - none	0.0	0.0
Additional paid-in capital	6,887.8	6,716.2
Retained earnings	12,008.2	10,893.0
Accumulated other comprehensive income	16.2	29.3
Treasury Stock, at cost; 17,104,177 shares in 2021 and 16,431,520 shares in 2020	(6,935.3)	(6,613.3)
Total stockholders' equity	11,977.0	11,025.3
Total liabilities and stockholders' equity	17,772.2	17,163.3
Class A Stock
Stockholders' equity:
Common stock	0.0	0.0
Total stockholders' equity	$ 0.0	$ 0.0
Common Stock, shares issued (in shares)	1,848,970	1,848,970
Common Stock
Stockholders' equity:
Common stock	$ 0.1	$ 0.1
Common Stock, shares issued (in shares)	121,899,178	121,533,460