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Earnings per Share
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Earnings per Share Earnings per Share
Earnings per share were calculated as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in millions, except per share data)2024202320242023
Net income - basic and diluted$129.8 $83.1 $238.2 $102.0 
Weighted-average common shares outstanding:
Basic101.1 97.9 100.6 97.5 
Effect of dilutive securities3.23.23.4 3.1 
Diluted104.3 101.1 104.0 100.6 
Earnings per share:
Basic$1.28 $0.85 $2.37 $1.05 
Diluted$1.24 $0.82 $2.29 $1.01 
Shares excluded from diluted per share amounts because their effect would have been anti-dilutive1.7 4.4 1.9 5.2