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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)   0.1        
Issuance of restricted stock to employees 0.0 $ 0.0        
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 205.8          
Loss on cash flow hedges, net of tax benefit 0.0          
Balance (in shares) at Sep. 30, 2018   22.9 1.0      
Balance at Sep. 30, 2018 1,205.1 $ 50.1 $ 0.1 45.9 0.0 1,109.0
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]            
Net income 93.1         93.1
Loss on cash flow hedges, net of tax benefit 0.0          
Issuance of stock in connection with employee stock plans 2.9 $ 2.9        
Repurchase of Class A common stock (in shares)   (0.5)        
Repurchase of Class A common stock (47.7) $ (47.7)        
Compensation for stock and stock option issuances and excess tax benefits from option exercises 2.9 $ 0.5   2.4    
Dividends paid (7.0)         (7.0)
Balance (in shares) at Sep. 30, 2018   22.9 1.0      
Balance at Sep. 30, 2018 1,205.1 $ 50.1 $ 0.1 45.9 0.0 1,109.0
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)   0.1        
Issuance of restricted stock to employees 0.0          
Repurchase of Class A common stock (3.1) $ (3.1)        
Class B common stock converted to Class A common stock (in shares)   0.2 (0.2)      
Class B common stock converted to Class A common stock 0.0          
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 203.5          
Loss on cash flow hedges, net of tax benefit (1.9)          
Balance (in shares) at Sep. 30, 2019   22.6 0.6      
Balance at Sep. 30, 2019 1,359.2 $ 16.9 $ 0.1 3.4 (1.9) 1,340.7
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 61.9         61.9
Loss on cash flow hedges, net of tax benefit (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 received (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
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 85.2         85.2
Loss on cash flow hedges, net of tax benefit (1.0)       (1.0)  
Issuance of stock in connection with employee stock plans 2.9 $ 2.9        
Class B common stock converted to Class A common stock (in shares)   0.2 (0.2)      
Class B common stock converted to Class A common stock 0.0          
Compensation for stock and stock option issuances and excess tax benefits from option exercises 4.4 $ 1.0   3.4    
Dividends paid (7.0)         (7.0)
Balance (in shares) at Sep. 30, 2019   22.6 0.6      
Balance at Sep. 30, 2019 $ 1,359.2 $ 16.9 $ 0.1 $ 3.4 $ (1.9) $ 1,340.7