Quarterly report pursuant to Section 13 or 15(d)

Earnings (Loss) Per Share of Common Stock (Details)

v3.10.0.1
Earnings (Loss) Per Share of Common Stock (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator        
Net income (loss) $ 7.9 $ (18.7) $ 8.0 $ (21.1)
Denominator        
Weighted average number of common shares outstanding (in shares) 25,793,019 26,648,693 25,763,550 27,398,673
Weighted average number of vested shares not yet issued (in shares) 202,761 162,153 182,091 128,778
Weighted average number of common shares outstanding - Basic (in shares) 25,995,780 26,810,846 25,945,641 27,527,451
Dilutive stock-based compensation awards outstanding (in shares) 187,067 0 128,635 0
Weighted average number of common shares outstanding - Diluted (in shares) 26,182,847 26,810,846 26,074,276 27,527,451
Stock compensation performance awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from computation of earnings per share (in shares) 111,556 624,305 514,910 665,842
Performance awards        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from computation of earnings per share (in shares) 1,003,486 853,974 1,021,883 842,428