Consolidated Balance Sheets - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents		$ 648.0	$ 320.0
Short-term marketable debt securities ($93.5 million and $85.2 million measured atfair value as of December 31, 2023 and 2022, respectively)		493.5	85.2
Accounts receivable, net of allowance for credit losses and customer deductions of $13.1 million and $19.6 million as of December 31, 2023 and 2022, respectively		1,033.2	1,031.8
Inventories		1,013.1	977.3
Prepaid expenses and other current assets		62.3	58.3
Federal and state income taxes receivable		4.3	35.7
Total current assets		3,254.4	2,508.3
Property, plant and equipment, net		3,863.8	3,900.0
Goodwill		922.4	922.4
Other intangible assets, net		229.6	267.9
Operating lease right-of-use assets		279.6	298.3
Long-term marketable debt securities		64.1	64.9
Other long-term assets		67.2	42.0
Total assets		8,681.1	8,003.8
Current liabilities:
Current maturities of long-term debt	[1]	399.6	0.0
Operating lease obligations		78.6	72.2
Finance lease obligations		2.0	1.9
Accounts payable		402.4	410.4
Dividends payable		115.9	115.5
Accrued liabilities		253.5	263.7
Accrued interest		13.7	11.8
Total current liabilities		1,265.7	875.5
Long-term liabilities:
Total long-term debt		2,472.2	2,473.6
Operating lease obligations		212.1	234.6
Finance lease obligations		8.7	10.8
Deferred income taxes		558.0	543.0
Compensation and benefits		106.4	141.8
Other long-term liabilities		60.7	57.4
Total long-term liabilities		3,418.1	3,461.2
Commitments and contingent liabilities (Note 19)
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized, 89.6 million and 89.7 million shares issued as of December 31, 2023 and 2022, respectively		0.9	0.9
Additional paid in capital		620.1	581.8
Retained earnings		3,447.2	3,186.8
Accumulated other comprehensive loss		(70.9)	(102.4)
Total stockholders' equity		3,997.3	3,667.1
Total liabilities and stockholders' equity		$ 8,681.1	$ 8,003.8

[1] The current portion of long-term debt excludes unamortized debt issuance costs of $0.3 million as of December 31, 2023.