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Consolidated Statements of Changes in Stockholders' Equity - 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
Balance (in shares) at Dec. 31, 2015   23.6 2.6      
Balance at Dec. 31, 2015 $ 828.1 $ 258.5 $ 0.3 $ 38.8 $ (0.3) $ 530.8
Net income 197.1         197.1
Gain on cash flow hedges, net of tax expense of $0.2 0.3       0.3  
Issuance of stock in connection with employee stock plans (in shares)   0.1        
Issuance of stock in connection with employee stock plans 6.9 $ 6.9        
Issuance of restricted stock to employees (in shares)   0.2        
Repurchase of Class A common stock (in shares)   (1.4)        
Repurchase of Class A common stock (112.9) $ (112.9)        
Class B common stock converted to Class A common stock (in shares)   0.8        
Class B common stock converted to Class A common stock 0.0 $ 0.1 $ (0.1)      
Class B common stock converted to Class A common stock (in shares)     (0.8)      
Compensation for stock and stock option issuances and excess tax benefits from option exercises 15.4 $ 13.0   2.4    
Dividends paid (24.1)         (24.1)
Balance (in shares) at Dec. 31, 2016   23.3 1.8      
Balance at Dec. 31, 2016 910.8 $ 165.6 $ 0.2 41.2 0.0 703.8
Adjustment to adopt new accounting principles       (0.2)   0.2
Net income 245.2         245.2
Gain on cash flow hedges, net of tax expense of $0.2 0.0          
Issuance of stock in connection with employee stock plans (in shares)   0.1        
Issuance of stock in connection with employee stock plans 7.5 $ 7.5        
Issuance of restricted stock to employees (in shares)   0.1        
Repurchase of Class A common stock (in shares)   (0.4)        
Repurchase of Class A common stock (33.8) $ (33.8)        
Class B common stock converted to Class A common stock (in shares)   0.8        
Class B common stock converted to Class A common stock 0.0 $ 0.1 $ (0.1)      
Class B common stock converted to Class A common stock (in shares)     (0.8)      
Compensation for stock and stock option issuances and excess tax benefits from option exercises 11.3 $ 7.6   3.7    
Option premiums paid (33.4)     (33.4)    
Dividends paid (26.5)         (26.5)
Issuance of stock in connection with acquisitions 2.1          
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
Adjustment to adopt new accounting principles 1.4         1.4
Net income 265.7         265.7
Gain on cash flow hedges, net of tax expense of $0.2 0.0          
Issuance of stock in connection with employee stock plans (in shares)   0.1        
Issuance of stock in connection with employee stock plans 10.1 $ 10.1        
Issuance of restricted stock to employees (in shares)   0.1        
Repurchase of Class A common stock (in shares)   (2.1)        
Repurchase of Class A common stock (148.9) $ (168.5)   19.6    
Compensation for stock and stock option issuances and excess tax benefits from option exercises 13.4 $ 9.3   4.1    
Dividends paid (27.7)         (27.7)
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