Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Current assets
Cash and cash equivalents	$ 28.9	$ 47.0
Accounts receivable—trade, less allowance for doubtful accounts of $0.3 in 2025 and 2024, respectively	276.2	268.5
Inventories, at lower of cost or market	413.0	401.6
Prepaid expenses and other current assets	29.7	31.0
Total current assets	747.8	748.1
Property, plant and equipment, at cost less accumulated depreciation and amortization of $2,173.5 in 2025 and $1,931.4 in 2024, respectively	2,962.8	2,813.2
Operating lease right-of-use assets, net	526.3	492.9
Intangible assets, net of amortization	139.3	139.5
Goodwill	328.0	328.0
Other assets	21.6	19.9
Total assets	4,725.8	4,541.6
Current liabilities
Current maturities of long-term debt	19.0	15.7
Trade accounts payable and accrued liabilities	865.2	874.4
Income taxes payable	44.9	57.8
Total current liabilities	929.1	947.9
Long-term debt, including capitalized lease obligations	2,163.6	1,832.7
Deferred income taxes	388.5	343.4
Asset retirement obligations	52.5	49.1
Non-current operating lease liabilities	534.6	496.3
Deferred credits and other liabilities	34.0	32.1
Total liabilities	4,102.3	3,701.5
Stockholders' Equity
Preferred Stock, par $0.01, (authorized 20,000,000 shares, none outstanding)	0.0	0.0
Common Stock, par $0.01, (authorized 200,000,000 shares, 46,767,164 shares issued at December 31, 2025 and 2024, respectively)	0.5	0.5
Treasury stock (28,201,581 and 26,750,846 shares held at December 31, 2025 and 2024, respectively)	(4,031.7)	(3,391.3)
Additional paid in capital (APIC)	482.4	487.5
Retained earnings	4,172.3	3,743.4
Total stockholders' equity	623.5	840.1
Total liabilities and stockholders' equity	$ 4,725.8	$ 4,541.6