CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 509.7	$ 484.6
Accounts receivable, net	582.4	552.5
Inventories	421.1	377.0
Other current assets	167.7	124.0
Total current assets	1,680.9	1,538.1
Property, plant and equipment	3,177.6	2,985.8
Less: accumulated depreciation and amortization	1,455.6	1,404.2
Property, plant and equipment, net	1,722.0	1,581.6
Operating lease right-of-use assets	104.4	104.5
Investments in affiliated companies	224.7	202.1
Goodwill	110.9	106.0
Intangible assets, net	9.7	10.8
Deferred income taxes	29.7	26.0
Other noncurrent assets	70.5	74.3
Total Assets	3,952.8	3,643.4
Current liabilities:
Accounts payable	239.0	239.3
Accrued salaries, wages and benefits	93.4	73.5
Income taxes payable	28.5	31.5
Operating lease liabilities	20.9	17.9
Other current liabilities	222.8	188.2
Total current liabilities	604.6	550.4
Long-term debt	202.6	202.6
Deferred income taxes	23.0	20.5
Pension and other postretirement benefits	30.8	28.2
Operating lease liabilities	79.8	81.8
Deferred compensation benefits	12.5	15.4
Other long-term liabilities	70.4	62.2
Total Liabilities	1,023.7	961.1
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: June 30, 2025 - 75.3 million, December 31, 2024 - 75.3 million; shares outstanding: June 30, 2025 - 71.9 million, December 31, 2024 - 72.3 million	18.8	18.8
Capital in excess of par value	0.0	22.1
Retained earnings	4,139.2	3,956.6
Accumulated other comprehensive loss	(88.7)	(258.1)
Treasury stock, at cost (June 30, 2025 - 3.4 million shares, December 31, 2024 - 3.0 million shares)	(1,140.2)	(1,057.1)
Total Equity	2,929.1	2,682.3
Total Liabilities and Equity	$ 3,952.8	$ 3,643.4