Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 618.7	$ 974.6
Short-term marketable debt securities	86.1	105.6
Accounts receivable, net of allowance for credit losses and customer deductions of $14.3 million and $10.6 million as of December 31, 2021 and 2020, respectively	1,071.0	832.4
Inventories	902.5	787.9
Prepaid expenses and other current assets	47.0	44.7
Federal and state income taxes receivable	7.4	5.1
Total current assets	2,732.7	2,750.3
Property, plant and equipment, net	3,529.0	3,193.4
Goodwill	923.5	863.5
Other intangible assets, net	308.4	295.9
Operating lease right-of-use assets	238.3	234.2
Long-term marketable debt securities	60.0	42.7
Other long-term assets	44.9	53.2
Total assets	7,836.8	7,433.2
Current liabilities:
Operating lease obligations	67.1	68.9
Finance lease obligations	1.7	1.6
Accounts payable	452.4	387.0
Dividends payable	96.3	97.0
Accrued liabilities	255.0	216.2
Accrued interest	12.3	11.9
Total current liabilities	884.8	782.6
Long-term liabilities:
Long-term debt	2,471.5	2,479.4
Operating lease obligations	179.3	173.6
Finance lease obligations	12.7	14.4
Deferred income taxes	465.9	379.4
Compensation and benefits	157.4	298.3
Other long-term liabilities	58.0	59.2
Total long-term liabilities	3,344.8	3,404.3
Commitments and contingent liabilities (Note 21)
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized, 93.5 million and 94.8 million shares issued as of December 31, 2021 and 2020, respectively	0.9	0.9
Additional paid in capital	579.4	554.4
Retained earnings	3,102.1	2,835.5
Accumulated other comprehensive loss	(75.2)	(144.5)
Total stockholders' equity	3,607.2	3,246.3
Total liabilities and stockholders' equity	$ 7,836.8	$ 7,433.2