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Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 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
September 30,		Nine Months Ended
September 30,
 2023202220232022
Earnings per common share—basic
Net income$29.7 $38.5 $172.1 $230.6 
Weighted-average common shares outstanding—basic185.2 184.8 185.2 184.9 
Earnings per common share—basic$0.16 $0.21 $0.93 $1.25 
Earnings per common share—diluted
Net income$29.7 $38.5 $172.1 $230.6 
Interest expense attributable to convertible notes1.6 1.6 4.8 4.8 
Net income attributable to earnings per common share—diluted$31.3 $40.1 $176.9 $235.4 
Weighted-average common shares outstanding—basic185.2 184.8 185.2 184.9 
Convertible Notes weighted-average common shares outstanding14.7 14.7 14.7 14.7 
Outstanding options, restricted stock units and performance share units1.3 2.3 1.4 1.4 
Weighted-average common shares outstanding—diluted201.2 201.8 201.3 201.0 
Earnings per common share—diluted$0.16 $0.20 $0.88 $1.17