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Consolidated Balance Sheets - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Current assets    
Cash and cash equivalents $ 163.6 $ 280.3
Accounts receivable—trade, less allowance for doubtful accounts of $0.1 in 2020 and $1.2 in 2019 168.8 172.9
Inventories, at lower of cost or market 279.1 227.6
Prepaid expenses and other current assets 13.7 30.0
Total current assets 625.2 710.8
Property, plant and equipment, at cost less accumulated depreciation and amortization of $1,191.4 in 2020 and $1,079.2 in 2019 1,867.6 1,807.3
Other assets 192.9 169.1
Total assets 2,685.7 2,687.2
Current liabilities    
Current maturities of long-term debt 51.2 38.8
Trade accounts payable and accrued liabilities 471.1 466.2
Income taxes payable 8.8 0.0
Total current liabilities 531.1 505.0
Long-term debt, including capitalized lease obligations 951.2 999.3
Deferred income taxes 218.4 216.7
Asset retirement obligations 35.1 32.8
Deferred credits and other liabilities 165.8 130.4
Total liabilities 1,901.6 1,884.2
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 2020 and 2019, respectively) 0.5 0.5
Treasury stock (19,518,551 and 16,307,048 shares held at December 31, 2020 and 2019, respectively) (1,490.9) (1,099.8)
Additional paid in capital (APIC) 533.3 538.7
Retained earnings 1,743.1 1,362.9
Accumulated other comprehensive income (AOCI) (1.9) 0.7
Total stockholders' equity 784.1 803.0
Total liabilities and stockholders' equity $ 2,685.7 $ 2,687.2