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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2024
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 earnings per common share (in millions, except per share amounts):
Three Months Ended
June 30		Six Months Ended
June 30
2024202320242023
Basic earnings per share:
Net income
$44.4 $63.3 $118.7 $140.7 
Less: Net income allocated to participating securities(0.8)(1.3)(2.2)(2.8)
Net income available to common shareholders$43.6 $62.0 $116.5 $137.9 
Weighted-average shares outstanding - basic
35.8 35.6 35.8 35.6 
Basic earnings per share
$1.22 $1.74 $3.25 $3.88 
Diluted earnings per share:
Net income
$44.4 $63.3 $118.7 $140.7 
Less: Net income allocated to participating securities(0.8)(1.3)(2.2)(2.8)
Net income available to common shareholders$43.6 $62.0 $116.5 $137.9 
Weighted-average shares outstanding - basic
35.8 35.6 35.8 35.6 
Effect of dilutive securities:
Equity compensation plans0.1 0.1 0.1 0.1 
Weighted-average shares outstanding - diluted
35.9 35.7 35.9 35.7 
Diluted earnings per share
$1.21 $1.74 $3.25 $3.87