Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 1,251.5	$ 1,207.7
Marketable investments	1,456.3	1,786.4
Accounts receivable, no allowance for 2024 and 2023	307.3	278.9
Inventories, net	120.2	111.8
Other current assets	113.4	166.2
Total current assets	3,248.7	3,551.0
Marketable investments	1,491.9	1,909.8
Goodwill and other intangible assets, net	115.4	114.2
Property, plant, and equipment, net	1,074.0	1,045.4
Deferred tax assets, net	396.1	394.8
Other non-current assets	169.1	151.8
Total assets	6,495.2	7,167.0
Current liabilities:
Accounts payable and accrued expenses	305.1	298.0
Line of credit (current)	400.0	400.0
Share tracking awards plan	29.2	35.4
Other current liabilities	126.3	71.0
Total current liabilities	860.6	804.4
Line of credit (non-current)	200.0	300.0
Other non-current liabilities	96.5	77.8
Total liabilities	1,157.1	1,182.2
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, 74,098,932 and 73,659,761 shares issued, and 44,204,517 and 47,040,545 shares outstanding as of March 31, 2024 and December 31, 2023, respectively	0.7	0.7
Additional paid-in capital	2,405.4	2,549.0
Accumulated other comprehensive loss	(15.6)	(12.8)
Treasury stock, 29,894,415 and $26,619,216 shares as of March 31, 2024 and December 31, 2023, respectively	(3,386.1)	(2,579.2)
Retained earnings	6,333.7	6,027.1
Total stockholders’ equity	5,338.1	5,984.8
Total liabilities and stockholders’ equity	$ 6,495.2	$ 7,167.0