Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 1,163.5	$ 961.2
Marketable investments	1,699.9	1,877.5
Accounts receivable, no allowance for 2023 and 2022	134.5	220.4
Inventories, net	102.5	102.0
Other current assets	92.6	219.2
Total current assets	3,193.0	3,380.3
Marketable investments	1,765.6	1,316.2
Goodwill and other intangible assets, net	44.5	44.5
Property, plant, and equipment, net	896.5	861.5
Deferred tax assets, net	321.9	327.7
Other non-current assets	124.5	114.3
Total assets	6,346.0	6,044.5
Current liabilities:
Accounts payable and accrued expenses	239.7	229.9
Share tracking awards plan	46.3	80.8
Other current liabilities	38.6	32.5
Total current liabilities	324.6	343.2
Line of credit	800.0	800.0
Other non-current liabilities	98.2	104.6
Total liabilities	1,222.8	1,247.8
Commitments and contingencies
Stockholders’ equity:
Preferred stock, par value $.01, 10,000,000 shares authorized, no shares issued	0.0	0.0
Common stock, par value $.01, 245,000,000 shares authorized, 73,317,754 and 72,651,280 shares issued, and 46,698,538 and 46,032,064 shares outstanding as of March 31, 2023 and December 31, 2022, respectively	0.7	0.7
Additional paid-in capital	2,457.3	2,388.4
Accumulated other comprehensive loss	(38.8)	(55.5)
Treasury stock, 26,619,216 shares as of March 31, 2023 and December 31, 2022	(2,579.2)	(2,579.2)
Retained earnings	5,283.2	5,042.3
Total stockholders’ equity	5,123.2	4,796.7
Total liabilities and stockholders’ equity	$ 6,346.0	$ 6,044.5