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Earnings per Share
12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Earnings per share
The following is a reconciliation of the number of shares and share equivalents used to calculate basic and diluted earnings per share (in millions, except per share amounts):
Year Ended December 31,
202320222021
Income from continuing operations$219.3 $266.9 $231.8 
Income from discontinued operations, net of income taxes— 1.2 178.1 
Net income $219.3 $268.1 $409.9 
Weighted-average number of common shares outstanding - basic48.3 50.6 52.7 
Dilutive effect of common share equivalents0.4 0.7 0.8 
Weighted-average number of common shares and share equivalents outstanding - diluted48.7 51.3 53.5 
Basic earnings per share:
Continuing operations$4.54 $5.27 $4.40 
Discontinued operations— 0.03 3.38 
$4.54 $5.30 $7.78 
Diluted earnings per share:
Continuing operations$4.50 $5.21 $4.33 
Discontinued operations— 0.02 3.33 
$4.50 $5.23 $7.66