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Income Per Share
9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Income Per Share Income Per Share
The following table shows how we reconcile our net income and the number of shares used in computing basic and diluted net income per share:

 Three months ended September 30,Nine months ended September 30,
(in millions, except share and per share amounts)2023202220232022
Basic net income per share:  
Consolidated net income (loss)$39.1 $(9.0)$67.6 $67.2 
Weighted average common shares outstanding42.7 42.5 42.6 42.7 
Basic net income (loss) per share$0.92 $(0.21)$1.59 $1.57 
Diluted net income (loss) per share:
Consolidated net income (loss)$39.1 $(9.0)$67.6 $67.2 
Weighted average common shares outstanding42.7 42.5 42.6 42.7 
Net effect of dilutive stock options and restricted stock units0.2 0.2 0.2 0.3 
Weighted average common shares outstanding for computing diluted income per share42.9 42.7 42.8 43.0 
Diluted net income (loss) per share$0.91 $(0.21)$1.58 $1.56 

During the periods presented, the number of anti-dilutive restricted stock units, performance share awards, or market stock units excluded from our calculation of diluted earnings per share was immaterial.