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Consolidated Balance Sheets - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Current assets        
Cash and cash equivalents $ 75.4 $ 170.0 $ 169.0 $ 153.8
Accounts receivable—trade, less allowance for doubtful accounts of $1.1 in 2018 and in 2017 231.2 225.2    
Inventories, at lower of cost or market 215.1 182.5    
Prepaid expenses and other current assets 19.6 36.5    
Total current assets 541.3 614.2    
Property, plant and equipment, at cost less accumulated depreciation and amortization of $944.4 in 2018 and $874.7 in 2017 1,741.9 1,679.5    
Other assets 42.4 37.3    
Total assets 2,325.6 2,331.0    
Current liabilities        
Current maturities of long-term debt 21.2 19.9    
Trade accounts payable and accrued liabilities 519.6 513.4    
Total current liabilities 540.8 533.3    
Long-term debt, including capitalized lease obligations 846.6 860.9    
Deferred income taxes 168.1 154.2    
Asset retirement obligations 30.0 28.2    
Deferred credits and other liabilities 11.2 16.0    
Total liabilities 1,596.7 1,592.6    
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 2018 and 2017, respectively) 0.5 0.5    
Treasury stock (14,526,155 and 12,675,630 shares held at 2018 and 2017, respectively) (941.6) (806.5)    
Additional paid in capital (APIC) 539.4 549.9    
Retained earnings 1,130.6 994.5    
Total stockholders' equity 728.9 738.4 $ 665.1 $ 697.1
Total liabilities and stockholders' equity $ 2,325.6 $ 2,331.0