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Earnings per Share
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Earnings per Share Earnings per Share
Earnings per share was calculated as follows:
Three Months Ended
September 30,		Nine Months Ended
September 30,
(in millions, except per share data)2023202220232022
Net income - basic and diluted$83.1 $68.5 $102.0 $65.5 
Weighted-average shares outstanding:
Basic97.9 95.8 97.5 95.6 
Effect of dilutive securities:
Stock options1.8 1.9 1.7 1.7 
Restricted stock0.7 0.8 0.7 0.5 
2024 Notes0.6 0.6 0.6 0.5 
Diluted101.1 99.0 100.6 98.3 
Earnings per share, basic$0.85 $0.72 $1.05 $0.69 
Earnings per share, diluted$0.82 $0.69 $1.01 $0.67 
Shares excluded from diluted per share amounts because their effect would have been anti-dilutive4.4 4.9 5.2 5.5