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Net Income Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net income $ 173.8 $ 151.2  
Weighted average common shares outstanding (in shares) 74,400,000 73,900,000  
Dilutive effect of equity awards, based on the treasury stock method (in shares) 1,600,000 1,900,000  
Weighted average shares assuming dilution (in shares) 76,000,000.0 75,800,000  
Antidilutive options excluded from computation of diluted net income per share (in shares) 0 100,000  
Stock repurchase program, shares authorized (in shares)     650,000
Stock repurchase program, shares purchased (in shares) 390,000    
Stock purchase program, cost of shares purchased $ 147.1 $ 137.1  
Stock repurchase program, average price per share (in dollars per share) $ 377.23