Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2021		Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 1,702.9	[1]	$ 974.6
Short-term marketable debt securities		88.3	[1]	105.6
Accounts receivable, net of allowance for credit losses and customer deductions of $15.1 million and $10.6 million as of September 30, 2021 and December 31, 2020, respectively		1,066.7		832.4
Inventories		880.1		787.9
Prepaid expenses and other current assets		55.4		44.7
Federal and state income taxes receivable		11.4		5.1
Total current assets		3,804.8		2,750.3
Property, plant, and equipment, net		3,360.8		3,193.4
Goodwill		863.5		863.5
Other intangible assets, net		267.7		295.9
Operating lease right-of-use assets		230.4		234.2
Long-term marketable debt securities		57.8	[1]	42.7
Other long-term assets		45.8		53.2
Total assets		8,630.8		7,433.2
Current liabilities:
Current maturities of long-term debt	[2]	698.1		0.0
Operating lease obligations		67.2		68.9
Finance lease obligations		1.7		1.6
Accounts payable		499.1		387.0
Dividends payable		97.3		97.0
Accrued liabilities		252.5		216.2
Accrued interest		28.5		11.9
Total current liabilities		1,644.4		782.6
Long-term liabilities:
Long-term debt		2,471.1		2,479.4
Operating lease obligations		171.5		173.6
Finance lease obligations		13.1		14.4
Deferred income taxes		423.9		379.4
Compensation and benefits		241.1		298.3
Other long-term liabilities		57.4		59.2
Total long-term liabilities		3,378.1		3,404.3
Commitments and contingent liabilities
Stockholders' equity:
Common stock, par value $0.01 per share, 300.0 million shares authorized, 95.0 million and 94.8 million shares issued as of September 30, 2021 and December 31, 2020, respectively		1.0		0.9
Additional paid in capital		581.3		554.4
Retained earnings		3,162.8		2,835.5
Accumulated other comprehensive loss		(136.8)		(144.5)
Total stockholders' equity		3,608.3		3,246.3
Total liabilities and stockholders' equity		$ 8,630.8		$ 7,433.2

[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.

[2] The current portion of long-term debt excludes unamortized debt issuance costs of $1.4 million at September 30, 2021.