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Earnings Per Common Share
 6 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
Earnings Per Common Share Earnings Per Common Share
The following table summarizes the computation of basic and diluted earnings per common share for the periods presented (in millions, except per share data):
Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Earnings per common share—basic
Net income$62.1 $117.4 $68.6 $142.4 
Weighted-average common shares outstanding—basic183.5 185.2 183.6 185.2 
Earnings per common share—basic$0.34 $0.63 $0.37 $0.77 
Earnings per common share—diluted
Net income$62.1 $117.4 $68.6 $142.4 
Interest expense attributable to convertible notes, net of tax1.7 1.6 3.3 3.2 
Net income attributable to earnings per common share—diluted$63.8 $119.0 $71.9 $145.6 
Weighted-average common shares outstanding—basic183.5 185.2 183.6 185.2 
Incremental shares for assumed conversion of Convertible Notes14.7 14.7 14.7 14.7 
Outstanding options, restricted stock units and performance share units1.4 1.4 1.1 1.5 
Weighted-average common shares outstanding—diluted199.6 201.3 199.4 201.4 
Earnings per common share—diluted$0.32 $0.59 $0.36 $0.72 
Anti-Dilutive Options and Restricted Stock Units
For the three and six months ended June 30, 2024, approximately 1.7 million and 2.1 million securities outstanding, respectively, comprised of stock options and restricted stock units, were excluded from the calculation of diluted earnings per common share as they would be anti-dilutive. For the three and six months ended June 30, 2023, approximately 1.3 million securities outstanding, comprised of stock options and restricted stock units, were excluded from the calculation of diluted earnings per common share as they would be anti-dilutive.