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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Common stock
Class A
Common stock
Class B
Additional paid-in capital
Accumulated other comprehensive loss
Retained earnings
Retained earnings
Cumulative Effect, Period of Adoption, Adjustment
Beginning balance at Dec. 31, 2017 $ 1,083.2 $ 149.1 $ 0.1 $ 11.3 $ 0.0 $ 922.7 $ 1.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 265.7         265.7  
Compensation for stock and stock option issuances and excess tax benefits from option exercises   9.3   4.1      
Issuance of stock in connection with employee stock plans   10.1          
Repurchase of class A common stock   (168.5)   19.6      
Loss on cash flow hedges, net of tax benefit of $2.0 and $0.3 $ 0.0            
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201602Member            
Dividends paid           (27.7)  
Ending balance at Dec. 31, 2018 $ 1,197.2 0.0 0.1 35.0 0.0 1,162.1 0.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 271.5         271.5  
Compensation for stock and stock option issuances and excess tax benefits from option exercises   12.7   3.5      
Issuance of stock in connection with employee stock plans   11.0          
Repurchase of class A common stock   (3.2)   0.0      
Loss on cash flow hedges, net of tax benefit of $2.0 and $0.3 $ (0.7)       (0.7)    
Option premium received (paid)       (7.5)   (5.1)  
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member            
Dividends paid           (27.6)  
Ending balance at Dec. 31, 2019 $ 1,467.7 20.5 0.1 46.0 (0.7) 1,401.8 $ (4.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 470.3         470.3  
Compensation for stock and stock option issuances and excess tax benefits from option exercises   11.6   11.6      
Issuance of stock in connection with employee stock plans   13.3          
Class B common stock converted to class A common stock   0.1 (0.1)        
Repurchase of class A common stock   (34.4)   (16.2)      
Equity issuances, net of issuance costs   777.1          
Loss on cash flow hedges, net of tax benefit of $2.0 and $0.3 (5.6)       (5.6)    
Dividends paid           (29.1)  
Ending balance at Dec. 31, 2020 $ 2,661.5 $ 788.2 $ 0.0 $ 41.4 $ (6.3) $ 1,838.2