Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 667.3	$ 618.7
Short-term marketable debt securities	82.3	86.1
Accounts receivable, net of allowance for credit losses and customer deductions of $21.3 million and $14.3 million as of June 30, 2022 and December 31, 2021, respectively	1,212.0	1,071.0
Inventories	954.2	902.5
Prepaid expenses and other current assets	74.6	47.0
Federal and state income taxes receivable		7.4
Total current assets	2,990.4	2,732.7
Property, plant, and equipment, net	3,762.9	3,529.0
Goodwill	922.5	923.5
Other intangible assets, net	287.3	308.4
Operating lease right-of-use assets	273.8	238.3
Long-term marketable debt securities	61.2	60.0
Other long-term assets	42.5	44.9
Total assets	8,340.6	7,836.8
Current liabilities:
Operating lease obligations	69.3	67.1
Finance lease obligations	1.8	1.7
Accounts payable	528.2	452.4
Dividends payable	120.2	96.3
Accrued liabilities	236.7	255.0
Accrued interest	11.7	12.3
Federal and state income taxes payable	5.0
Total current liabilities	972.9	884.8
Long-term liabilities:
Long-term debt	2,472.6	2,471.5
Operating lease obligations	210.9	179.3
Finance lease obligations	11.7	12.7
Deferred income taxes	495.1	465.9
Compensation and benefits	153.2	157.4
Other long-term liabilities	59.7	58.0
Total long-term liabilities	3,403.2	3,344.8
Commitments and contingent liabilities
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized, 93.7 million and 93.5 million shares issued as of June 30, 2022 and December 31, 2021, respectively	0.9	0.9
Additional paid in capital	601.0	579.4
Retained earnings	3,437.0	3,102.1
Accumulated other comprehensive loss	(74.4)	(75.2)
Total stockholders' equity	3,964.5	3,607.2
Total liabilities and stockholders' equity	$ 8,340.6	$ 7,836.8