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Net Income (Loss) Per Common Share
 9 Months Ended
Jul. 31, 2021
Earnings Per Share [Abstract]  
Net Income (Loss) Per Common Share NET INCOME (LOSS) PER COMMON SHARE
Basic and Diluted Net Income (Loss) Per Common Share Calculations
Three Months Ended July 31,Nine Months Ended July 31,
(in millions, except per share amounts)2021202020212020
(Loss) income from continuing operations$(13.7)$56.0 $92.0 $(52.9)
Income from discontinued operations, net of taxes— — — 0.1 
Net (loss) income$(13.7)$56.0 $92.0 $(52.8)
Weighted-average common and common
  equivalent shares outstanding — Basic
67.5 66.9 67.3 66.9 
Effect of dilutive securities(1)
Restricted stock units— 0.1 0.4 — 
Stock options— 0.1 — — 
Performance shares— 0.1 0.1 — 
Weighted-average common and common
  equivalent shares outstanding — Diluted
67.5 67.2 67.8 66.9 
Net (loss) income per common share — Basic
(Loss) income from continuing operations$(0.20)$0.84 $1.37 $(0.79)
Income from discontinued operations— — — — 
Net (loss) income$(0.20)$0.84 $1.37 $(0.79)
Net (loss) income per common share — Diluted
(Loss) income from continuing operations $(0.20)$0.83 $1.36 $(0.79)
Income from discontinued operations— — — — 
Net (loss) income$(0.20)$0.83 $1.36 $(0.79)
(1) Excludes the impact of potentially dilutive outstanding share-based securities that are excluded from the calculation of diluted loss per share in periods when we have a loss, as their inclusion would have an anti-dilutive effect. Such impact is included in the table below.
Anti-Dilutive Outstanding Stock Awards Issued Under Share-Based Compensation Plans
Three Months Ended July 31,Nine Months Ended July 31,
(in millions)2021202020212020
Anti-dilutive— 0.4 — 0.6