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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Common Stock
Common Stock
Class B
 [1]
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Adjustment to adopt ASC 326
Retained Earnings
Beginning balance at Dec. 31, 2019 $ 1,467.7 $ 20.5 [1] $ 0.1 $ 46.0 $ (0.7) $ 1,401.8 $ (4.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Compensation for stock and stock option issuances and excess tax benefits from option exercises   9.8 [1]   0.3      
Issuance of stock in connection with employee stock plans [1]   6.1          
Repurchase of common stock   (34.3) [1]   (16.2)      
Gain (loss) on cash flow hedges, net of tax (expense) benefit of ($0.1), $0.5, ($0.7), and $2.3, respectively (6.5)       (6.5)    
Net income 123.9         123.9  
Dividends paid           (13.8)  
Ending balance at Jun. 30, 2020 1,532.2 2.1 [1] 0.1 30.1 (7.2) 1,507.1  
Beginning balance at Mar. 31, 2020 1,456.5 0.0 [1] 0.1 26.0 (5.8) 1,436.2  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Compensation for stock and stock option issuances and excess tax benefits from option exercises   0.9 [1]   4.1      
Issuance of stock in connection with employee stock plans [1]   3.5          
Repurchase of common stock [1]   (2.3)          
Gain (loss) on cash flow hedges, net of tax (expense) benefit of ($0.1), $0.5, ($0.7), and $2.3, respectively (1.4)       (1.4)    
Net income 77.7         77.7  
Dividends paid           (6.8)  
Ending balance at Jun. 30, 2020 1,532.2 2.1 [1] 0.1 30.1 (7.2) 1,507.1  
Beginning balance at Dec. 31, 2020 2,661.5 788.2 [1] 0.0 41.4 (6.3) 1,838.2  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Compensation for stock and stock option issuances and excess tax benefits from option exercises   14.6 [1]   2.6      
Issuance of stock in connection with employee stock plans [1]   9.7          
Repurchase of common stock [1]   (15.9)          
Equity issuances, net of issuance costs [1]   1,110.3          
Gain (loss) on cash flow hedges, net of tax (expense) benefit of ($0.1), $0.5, ($0.7), and $2.3, respectively 2.0       2.0    
Net income 461.1         461.1  
Dividends paid           (17.5)  
Ending balance at Jun. 30, 2021 4,228.4 1,906.9 [1] 0.0 44.0 (4.3) 2,281.8  
Beginning balance at Mar. 31, 2021 2,807.6 789.9 [1] 0.0 36.0 (4.5) 1,986.2  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Compensation for stock and stock option issuances and excess tax benefits from option exercises   1.2 [1]   8.0      
Issuance of stock in connection with employee stock plans [1]   5.5          
Repurchase of common stock [1]   0.0          
Equity issuances, net of issuance costs [1]   1,110.3          
Gain (loss) on cash flow hedges, net of tax (expense) benefit of ($0.1), $0.5, ($0.7), and $2.3, respectively 0.2       0.2    
Net income 304.9         304.9  
Dividends paid           (9.3)  
Ending balance at Jun. 30, 2021 $ 4,228.4 $ 1,906.9 [1] $ 0.0 $ 44.0 $ (4.3) $ 2,281.8  
[1] Prior to June 7, 2021, common stock was classified as Class A common stock. The Class A common stock reclassification as common stock occurred in connection with the elimination of the Company’s classified common stock structure following the conversion of all Class B common stock to Class A common stock.