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Earnings Per Common Share (Tables)
 6 Months Ended
Jun. 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
June 30,		Six Months Ended
June 30,
 2023202220232022
Earnings per common share—basic
Net income$117.4 $105.4 $142.4 $192.1 
Weighted-average common shares outstanding—basic185.2 184.7 185.2 184.9 
Earnings per common share—basic$0.63 $0.57 $0.77 $1.04 
Earnings per common share—diluted
Net income$117.4 $105.4 $142.4 $192.1 
Interest expense1.6 1.6 3.2 3.2 
Net income attributable to earnings per common share—diluted$119.0 $107.0 $145.6 $195.3 
Weighted-average common shares outstanding—basic185.2 184.7 185.2 184.9 
Convertible Notes weighted-average common shares outstanding14.7 14.7 14.7 14.7 
Outstanding options, restricted stock units and performance share units1.4 1.2 1.5 1.1 
Weighted-average common shares outstanding—diluted201.3 200.6 201.4 200.7 
Earnings per common share—diluted$0.59 $0.53 $0.72 $0.97