Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	[1]	$ 692.4	$ 648.0
Short-term marketable debt securities ($92.3 million and $93.5 million measured at fair value as of March 31, 2024 and December 31, 2023, respectively)	[1]	492.3	493.5
Accounts receivable, net of allowance for credit losses and customer deductions of $12.1 million and $13.1 million as of March 31, 2024 and December 31, 2023, respectively		1,045.1	1,033.2
Inventories		1,003.6	1,013.1
Prepaid expenses and other current assets		211.7	62.3
Federal and state income taxes receivable			4.3
Total current assets		3,445.1	3,254.4
Property, plant, and equipment, net		3,864.5	3,863.8
Goodwill		922.4	922.4
Other intangible assets, net		220.1	229.6
Operating lease right-of-use assets		269.4	279.6
Long-term marketable debt securities	[1]	68.5	64.1
Other long-term assets		67.0	67.2
Total assets		8,857.0	8,681.1
Current liabilities:
Current maturities of long-term debt		399.8	399.6
Operating lease obligations		79.2	78.6
Finance lease obligations		2.0	2.0
Accounts payable		449.6	402.4
Dividends payable		114.9	115.9
Accrued liabilities		304.0	253.5
Accrued interest		33.3	13.7
Federal and state income taxes payable		17.5
Total current liabilities		1,400.3	1,265.7
Long-term liabilities:
Long-term debt		2,472.7	2,472.2
Operating lease obligations		200.7	212.1
Finance lease obligations		8.3	8.7
Deferred income taxes		566.5	558.0
Compensation and benefits		112.1	106.4
Other long-term liabilities		65.4	60.7
Total long-term liabilities		3,425.7	3,418.1
Commitments and contingent liabilities (Note 19)
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized, 89.8 million and 89.6 million shares issued as of March 31, 2024 and December 31, 2023, respectively		0.9	0.9
Additional paid in capital		640.5	620.1
Retained earnings		3,459.6	3,447.2
Accumulated other comprehensive loss		(70.0)	(70.9)
Total stockholders' equity		4,031.0	3,997.3
Total liabilities and stockholders' equity		$ 8,857.0	$ 8,681.1

[1] Valuations based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data.