Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 320.0	$ 618.7
Short-term marketable debt securities	85.2	86.1
Accounts receivable, net of allowance for credit losses and customer deductions of $19.6 million and $14.3 million as of December 31, 2022 and 2021, respectively	1,031.8	1,071.0
Inventories	977.3	902.5
Prepaid expenses and other current assets	58.3	47.0
Federal and state income taxes receivable	35.7	7.4
Total current assets	2,508.3	2,732.7
Property, plant and equipment, net	3,900.0	3,529.0
Goodwill	922.4	923.5
Other intangible assets, net	267.9	308.4
Operating lease right-of-use assets	298.3	238.3
Long-term marketable debt securities	64.9	60.0
Other long-term assets	42.0	44.9
Total assets	8,003.8	7,836.8
Current liabilities:
Operating lease obligations	72.2	67.1
Finance lease obligations	1.9	1.7
Accounts payable	410.4	452.4
Dividends payable	115.5	96.3
Accrued liabilities	263.7	255.0
Accrued interest	11.8	12.3
Total current liabilities	875.5	884.8
Long-term liabilities:
Long-term debt	2,473.6	2,471.5
Operating lease obligations	234.6	179.3
Finance lease obligations	10.8	12.7
Deferred income taxes	543.0	465.9
Compensation and benefits	141.8	157.4
Other long-term liabilities	57.4	58.0
Total long-term liabilities	3,461.2	3,344.8
Commitments and contingent liabilities (Note 21)
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized, 89.7 million and 93.5 million shares issued as of December 31, 2022 and 2021, respectively	0.9	0.9
Additional paid in capital	581.8	579.4
Retained earnings	3,186.8	3,102.1
Accumulated other comprehensive loss	(102.4)	(75.2)
Total stockholders' equity	3,667.1	3,607.2
Total liabilities and stockholders' equity	$ 8,003.8	$ 7,836.8