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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net (loss) earnings $ (2.1) $ 10.6 $ 27.2 $ 6.4
Less: net earnings allocated to participating securities (0.4) (0.2) (1.3) (0.7)
Net (loss) earnings available to common shareholders $ (2.5) $ 10.4 $ 25.9 $ 5.7
Denominator (in thousands):        
Weighted-average common shares outstanding, shares for basic earnings per share (in shares) 33,947 33,884 33,918 33,880
Weighted-average awards outstanding (in shares) 0 0 0 0
Shares for diluted earnings per share (in shares) 33,947 33,884 33,918 33,880
Net (loss) earnings per common share, basic (in dollars per share) $ (0.07) $ 0.31 $ 0.78 $ 0.17
Net (loss) earnings per common share, diluted (in dollars per share) $ (0.07) $ 0.31 $ 0.76 $ 0.17
Participating securities (in shares) 389 321 404 291
Weighted anti-dilutive awards outstanding (in shares) 1,167 1,194 1,228 1,049