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Earnings Per Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Per Share
Earnings per share were calculated as follows:
Year Ended December 31,
(in millions, except per share data)202120202019
Net income - basic and diluted$89.6 $407.3 $37.0 
Weighted-average common shares outstanding:
Basic94.6 93.1 91.6 
Effect of dilutive securities:
Stock options1.8 2.4 2.6 
Restricted stock units0.3 0.5 0.4 
2024 Notes1.1 1.8 1.1 
Diluted97.9 97.8 95.7 
Earnings per share:
Basic$0.95 $4.38 $0.40 
Diluted$0.92 $4.16 $0.39 
Shares which have been excluded from diluted per share amounts because their effect would have been anti-dilutive were 4.1 million for 2021, 2.5 million for 2020 and 2.1 million for 2019.