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Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 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 common share (in millions, except per share data):
Three Months Ended
March 31,
 20232022
Earnings per common share—basic
Net income$25.0 $86.7 
Weighted-average common shares outstanding—basic185.2 185.1 
Earnings per common share—basic$0.13 $0.47 
Earnings per common share—diluted
Net income$25.0 $86.7 
Interest expense(1)
1.6 1.6 
Net income attributable to earnings per common share—diluted$26.6 $88.3 
Weighted-average common shares outstanding—basic185.2 185.1 
Convertible Notes weighted-average common shares outstanding(1)
14.7 14.7 
Outstanding options, restricted stock units and performance share units1.6 1.0 
Weighted-average common shares outstanding—diluted201.5 200.8 
Earnings per common share—diluted$0.13 $0.44 
(1) The If-converted method is used for calculating the dilutive weighted-average shares outstanding related to the Convertible Notes when calculating earnings per common share-diluted. Under this method, interest expense related to the Convertible Notes for the period presented is excluded from net income.