Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Property Plant and equipment, accumulated depreciation and amortization $ 318.8 $ 296.1
Intangible assets, accumulated amortization $ 12.0 $ 5.2
Common stock, par value (in dollars per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 28,284,358 28,183,218
Common stock, shares outstanding (in shares) 25,832,193 25,734,222
Preferred stock, par value (in dollars per share) $ 0.0001  
Preferred stock, shares authorized (in shares) 15,000,000  
Preferred stock, shares issued (in shares) 0  
Treasury stock (in shares) 2,452,165 2,448,996