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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Computation of basic and diluted net income per common share
The following table shows the computation of our basic and diluted net income per common share (in millions, except per share amounts):
Three Months Ended
March 31
20212020
Numerator:
Net income from continuing operations
$36.5 $47.2 
Net loss from discontinued operations
— (0.9)
Net income
$36.5 $46.3 
Denominator:
Weighted-average shares outstanding - basic
35.2 34.9 
Effect of dilutive securities:
Equity compensation plans0.7 0.5 
Weighted-average shares outstanding - diluted
35.9 35.4 
Basic earnings per share from continuing operations
$1.04 $1.35 
Basic earnings per share from discontinued operations
— (0.02)
Basic earnings per share from consolidated operations
$1.04 $1.33 
Diluted earnings per share from continuing operations
$1.02 $1.33 
Diluted earnings per share from discontinued operations
— (0.02)
Diluted earnings per share from consolidated operations
$1.02 $1.31