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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Summary of Computation of Basic and Diluted Earnings Per Share
The following table summarizes the computation of basic and diluted earnings per share (in millions, except per share data):
Year Ended December 31,
 202320222021
Earnings per common share—basic
Net income$95.0 $157.9 $322.0 
Weighted-average common shares outstanding—basic185.0 184.9 169.1 
Earnings per common share—basic$0.51 $0.85 $1.90 
Earnings per common share—diluted
Net income$95.0 $157.9 $322.0 
Interest expense6.5 6.4 — 
Net income attributable to earnings per common share—diluted$101.5 $164.3 $322.0 
Weighted-average common shares outstanding—basic185.0 184.9 169.1 
Weighted-average shares outstanding - Convertible Notes(1)
14.7 14.7 5.9 
Outstanding options, restricted stock units and performance share units1.4 1.7 1.9 
Weighted-average common shares outstanding—diluted201.1 201.3 176.9 
Earnings per common share—diluted$0.50 $0.82 $1.82 
(1) For 2021, the Dilutive impact of the Convertible Notes was calculated using the Treasury Stock Method. See Note 3 for further detail.