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Net Income Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Reconciliation of Basic to Diluted Net Income Per Share
The following table reconciles the shares used in the calculation of basic net income per share to those used for diluted net income per share:

(in millions)202020192018
Net income$346.2 $241.7 $206.9 
Weighted average common shares outstanding73.9 74.0 73.9 
Dilutive effect of equity awards, based on the treasury stock method
1.9 1.4 1.5 
Weighted average shares assuming dilution75.8 75.4 75.4