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Net Income Per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Net Income Per Share Net Income Per Share
Net income per share was calculated as follows:
Year Ended December 31,
(in millions, except per share data)202020192018
Net income - basic and diluted$407.3 $37.0 $21.1 
Weighted-average common shares outstanding:
Basic93.1 91.6 90.2 
Effect of dilutive securities:
Stock options2.4 2.6 3.2 
Restricted stock units0.5 0.4 0.6 
2024 Notes1.8 1.1 1.3 
Diluted97.8 95.7 95.4 
Net income per share:
Basic$4.38 $0.40 $0.23 
Diluted$4.16 $0.39 $0.22 
Shares which have been excluded from diluted per share amounts because their effect would have been anti-dilutive were 2.5 million, 2.1 million and 0.9 million for 2020, 2019 and 2018, respectively.