Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Current assets
Cash and cash equivalents	$ 54.1	$ 47.0
Accounts receivable—trade, less allowance for doubtful accounts of $0.4 and $0.3 at 2025 and 2024, respectively	296.3	268.5
Inventories, at lower of cost or market	397.5	401.6
Prepaid expenses and other current assets	28.5	31.0
Total current assets	776.4	748.1
Property, plant and equipment, at cost less accumulated depreciation and amortization of $2,042.9 and $1,931.4 at 2025 and 2024, respectively	2,854.5	2,813.2
Operating lease right of use assets, net	503.2	492.9
Intangible assets, net of amortization	139.4	139.5
Goodwill	328.0	328.0
Other assets	20.7	19.9
Total assets	4,622.2	4,541.6
Current liabilities
Current maturities of long-term debt	14.5	15.7
Trade accounts payable and accrued liabilities	915.9	874.4
Income taxes payable	45.7	57.8
Total current liabilities	976.1	947.9
Long-term debt, including capitalized lease obligations	2,066.7	1,832.7
Deferred income taxes	343.3	343.4
Asset retirement obligations	50.3	49.1
Non-current operating lease liabilities	508.4	496.3
Deferred credits and other liabilities	31.3	32.1
Total liabilities	3,976.1	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 2025 and 2024, respectively)	0.5	0.5
Treasury stock (27,474,809 and 26,750,846 shares held at 2025 and 2024, respectively)	(3,745.9)	(3,391.3)
Additional paid in capital (APIC)	469.1	487.5
Retained earnings	3,922.4	3,743.4
Total stockholders' equity	646.1	840.1
Total liabilities and stockholders' equity	$ 4,622.2	$ 4,541.6