CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 601.8	$ 853.9
Accounts receivable, net	524.0	512.0
Inventories	429.9	434.7
Other current assets	137.2	135.8
Total current assets	1,692.9	1,936.4
Property, plant and equipment	2,791.3	2,738.0
Less: accumulated depreciation and amortization	1,342.7	1,324.7
Property, plant and equipment, net	1,448.6	1,413.3
Operating lease right-of-use assets	96.8	99.2
Investments in affiliated companies	202.5	210.0
Goodwill	107.6	108.5
Intangible assets, net	13.9	15.1
Deferred income taxes	21.0	25.7
Other noncurrent assets	19.0	21.3
Total Assets	3,602.3	3,829.5
Current liabilities:
Notes payable and other current debt	133.4	134.0
Accounts payable	240.1	242.4
Accrued salaries, wages and benefits	66.5	105.9
Income taxes payable	16.8	16.6
Operating lease liabilities	18.0	17.7
Other current liabilities	173.6	155.2
Total current liabilities	648.4	671.8
Long-term debt	72.8	72.8
Deferred income taxes	12.7	12.7
Pension and other postretirement benefits	28.9	29.6
Long-term operating lease liabilities	82.4	84.5
Deferred compensation benefits	18.6	18.6
Other long-term liabilities	57.9	58.5
Total Liabilities	921.7	948.5
Commitments and contingencies (Note 16)
Equity:
Preferred stock, 3.0 million shares authorized; 0 shares issued and outstanding	0.0	0.0
Common stock, par value $0.25 per share; 200.0 million shares authorized; shares issued: 75.3 million as of March 31, 2024 and December 31, 2023, respectively; shares outstanding: 73.0 million and 73.5 million as of March 31, 2024 and December 31, 2023, respectively	18.8	18.8
Capital in excess of par value	55.2	120.2
Retained earnings	3,624.1	3,523.4
Accumulated other comprehensive loss	(192.3)	(143.8)
Treasury stock, at cost (2.3 million and 1.8 million shares)	(825.2)	(637.6)
Total Equity	2,680.6	2,881.0
Total Liabilities and Equity	$ 3,602.3	$ 3,829.5