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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Class A
Common Stock
Class B
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Retained earnings adjustment for adoption of ASC $ 1.4         $ 1.4
Balance (in shares) at Dec. 31, 2017   23.9 1.0      
Balance at Dec. 31, 2017 1,083.2 $ 149.1 $ 0.1 $ 11.3 $ 0.0 922.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 52.1         52.1
Issuance of stock in connection with employee stock plans $ 1.8 $ 1.8        
Issuance of restricted stock to employees (in shares) 0.0 0.1        
Repurchase of Class A common stock (in shares)   (0.1)        
Repurchase of Class A common stock $ (8.2) $ (8.2)        
Compensation for stock and stock option issuances and excess tax benefits from option exercises 3.6 $ 0.3   3.3    
Dividends paid (6.8)         (6.8)
Balance (in shares) at Mar. 31, 2018   23.9 1.0      
Balance at Mar. 31, 2018 1,127.1 $ 143.0 $ 0.1 14.6 0.0 969.4
Balance (in shares) at Dec. 31, 2017   23.9 1.0      
Balance at Dec. 31, 2017 1,083.2 $ 149.1 $ 0.1 11.3 0.0 922.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 112.7          
Balance (in shares) at Jun. 30, 2018   23.4 1.0      
Balance at Jun. 30, 2018 1,160.9 $ 94.4 $ 0.1 43.5 0.0 1,022.9
Balance (in shares) at Mar. 31, 2018   23.9 1.0      
Balance at Mar. 31, 2018 1,127.1 $ 143.0 $ 0.1 14.6 0.0 969.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 60.7         60.7
Issuance of stock in connection with employee stock plans (in shares)   0.1        
Issuance of stock in connection with employee stock plans 2.7 $ 2.7        
Repurchase of Class A common stock (in shares)   (0.6)        
Repurchase of Class A common stock (59.1) $ (59.1)        
Compensation for stock and stock option issuances and excess tax benefits from option exercises 3.3 $ 7.8   (4.5)    
Option premiums received (paid) 33.4     33.4    
Dividends paid (7.2)         (7.2)
Balance (in shares) at Jun. 30, 2018   23.4 1.0      
Balance at Jun. 30, 2018 1,160.9 $ 94.4 $ 0.1 43.5 0.0 1,022.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Retained earnings adjustment for adoption of ASC 0.9         0.9
Balance (in shares) at Dec. 31, 2018   22.0 1.0      
Balance at Dec. 31, 2018 1,197.2 $ 0.0 $ 0.1 35.0 0.0 1,162.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 56.4         56.4
Issuance of stock in connection with employee stock plans $ 2.3 $ 2.3        
Issuance of restricted stock to employees (in shares) 0.0 0.1        
Repurchase of Class A common stock $ (3.1) $ (3.1)        
Class B common stock converted to Class A common stock (in shares) 0.0 0.2 (0.2)      
Compensation for stock and stock option issuances and excess tax benefits from option exercises $ 3.5 $ 10.5   (7.0)    
Dividends paid (6.7)         (6.7)
Balance (in shares) at Mar. 31, 2019   22.3 0.8      
Balance at Mar. 31, 2019 1,250.5 $ 9.7 $ 0.1 28.0 0.0 1,212.7
Balance (in shares) at Dec. 31, 2018   22.0 1.0      
Balance at Dec. 31, 2018 1,197.2 $ 0.0 $ 0.1 35.0 0.0 1,162.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 118.3          
Balance (in shares) at Jun. 30, 2019   22.4 0.8      
Balance at Jun. 30, 2019 1,274.7 $ 13.0 $ 0.1 0.0 (0.9) 1,262.5
Balance (in shares) at Mar. 31, 2019   22.3 0.8      
Balance at Mar. 31, 2019 1,250.5 $ 9.7 $ 0.1 28.0 0.0 1,212.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 61.9         61.9
Loss on cash flow hedges, net of tax expense of $0.3, $0.0, $0.3, and $0.0, respectively (0.9)       (0.9)  
Issuance of stock in connection with employee stock plans (in shares)   0.1        
Issuance of stock in connection with employee stock plans 2.8 $ 2.8        
Compensation for stock and stock option issuances and excess tax benefits from option exercises 3.9 $ 0.5   3.4    
Option premiums paid (36.5)     (31.4)   (5.1)
Dividends paid (7.0)         (7.0)
Balance (in shares) at Jun. 30, 2019   22.4 0.8      
Balance at Jun. 30, 2019 $ 1,274.7 $ 13.0 $ 0.1 $ 0.0 $ (0.9) $ 1,262.5