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Earnings Per Common Share
 9 Months Ended
Sep. 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 September 30,Nine Months Ended September 30,
 2024202320242023
(Loss) earnings per common share—basic
Net (loss) income$(3.6)$29.7 $65.0 $172.1 
Weighted-average common shares outstanding—basic183.8 185.2 183.7 185.2 
(Loss) earnings per common share—basic$(0.02)$0.16 $0.35 $0.93 
(Loss) earnings per common share—diluted
Net (loss) income$(3.6)$29.7 $65.0 $172.1 
Interest expense attributable to convertible notes, net of tax— 1.6 4.9 4.8 
Net (loss) income attributable to earnings per common share—diluted$(3.6)$31.3 $69.9 $176.9 
Weighted-average common shares outstanding—basic183.8 185.2 183.7 185.2 
Incremental shares for assumed conversion of Convertible Notes— 14.7 14.7 14.7 
Outstanding options, restricted stock units and performance share units— 1.3 0.9 1.4 
Weighted-average common shares outstanding—diluted183.8 201.2 199.3 201.3 
(Loss) earnings per common share—diluted$(0.02)$0.16 $0.35 $0.88 
Anti-Dilutive Options and Restricted Stock Units
For the three months ended September 30, 2024, basic and diluted loss per common share are equivalent due to the net loss position for the period. For the nine months ended September 30, 2024, approximately 2.3 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. For the three and nine months ended September 30, 2023, approximately 3.0 million and 1.9 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.