Earnings (loss) per Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Summary of Basic and Diluted Earnings Per Common Share The following table sets forth the computation of basic and diluted earnings (loss) per common share (in millions, except for share and per-share data):
 Three Months Ended
June 30,
Six Months Ended
June 30,
 2021202020212020
(Restated)(Restated)
Numerator:
Net (loss) earnings from continuing operations$(16.4)$(7.2)$25.5 $32.8 
Less: net loss allocated to participating securities(a)
(0.3)(0.3)(0.6)(0.5)
Net (loss) earnings from continuing operations available to common stockholders(16.7)(7.5)24.9 32.3 
Net earnings (loss) from discontinued operations available to common stockholders72.6 3.9 (182.8)(2.1)
Net earnings (loss) available to common stockholders$55.9 $(3.6)$(157.9)$30.2 
Denominator (in thousands):
Weighted-average common shares outstanding, shares for basic earnings per share34,020 33,915 33,997 33,903 
Weighted-average awards outstanding(b)
58 — 48 — 
Shares for diluted earnings per share34,078 33,915 34,045 33,903 
Basic net (loss) earnings from continuing operations per common share$(0.49)$(0.22)$0.73 $0.95 
Basic net earnings (loss) from discontinued operations per common share2.13 0.11 (5.38)(0.06)
Basic net earnings (loss) per common share$1.64 $(0.11)$(4.65)$0.89 
Diluted net (loss) earnings from continuing operations per common share$(0.49)$(0.22)$0.73 $0.94 
Diluted net earnings (loss) from discontinued operations per common share2.12 0.11 (5.38)(0.06)
Diluted net earnings (loss) per common share$1.63 $(0.11)$(4.65)$0.88 
(a)Weighted participating securities include RSUs and PSUs that receive non-forfeitable dividends and consist of 432,000 and 439,000 weighted participating securities for the three and six months ended June 30, 2021, respectively, and 411,000 and 412,000 weighted participating securities for the three and six months ended June 30, 2020, respectively.
(b)For the calculation of diluted net (loss) earnings per share, the Company uses the more dilutive of either the treasury stock method or the two-class method to determine the weighted-average number of outstanding common shares. In addition, the Company had 1,171,000 and 1,225,000 weighted-average equity awards outstanding for the three and six months ended June 30, 2021, respectively, and 1,255,000 and 1,265,000 weighted-average equity awards outstanding for the three and six months ended June 30, 2020, respectively, that were anti-dilutive.