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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings (Accumulated Deficit)
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2019   28,800,000        
Beginning balance at Dec. 31, 2019 $ 644.3 $ 0.3 $ 1,796.9 $ (351.2) $ (109.7) $ (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 73.7     73.7    
Other comprehensive income 2.7       2.7  
Stock-based compensation charges 16.4   16.4      
Net settlement on vesting of equity awards (in shares)   300,000        
Net settlement on vesting of equity awards (3.0)   (3.0)      
Employee stock purchase plan 2.3   2.3      
Exercise of stock options (in shares)   300,000        
Exercise of stock options 5.6   5.6      
Ending balance (in shares) at Dec. 31, 2020   29,400,000        
Ending balance at Dec. 31, 2020 742.0 $ 0.3 1,818.2 (277.5) (107.0) (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 224.1     224.1    
Other comprehensive income 6.8       6.8  
Stock-based compensation charges 23.3   23.3      
Net settlement on vesting of equity awards (in shares)   200,000        
Net settlement on vesting of equity awards (9.0)   (9.0)      
Dividends declared (15.1)   (15.1)      
Employee stock purchase plan (in shares)   100,000        
Employee stock purchase plan 2.6   2.6      
Exercise of stock options 2.2   2.2      
Ending balance (in shares) at Dec. 31, 2021   29,700,000        
Ending balance at Dec. 31, 2021 976.9 $ 0.3 1,822.2 (53.4) (100.2) (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 329.9     329.9    
Other comprehensive income (28.3)       (28.3)  
Stock-based compensation charges 27.1   27.1      
Net settlement on vesting of equity awards (in shares)   300,000        
Net settlement on vesting of equity awards (15.5)   (15.5)      
Dividends declared (70.0)   (17.6) (52.4)    
Employee stock purchase plan $ 3.6   3.6      
Exercise of stock options (in shares) 5,661          
Exercise of stock options $ 0.2   0.2      
Repurchase of common stock (in shares)   (1,100,000)        
Repurchase of common stock (115.2)         (115.2)
Ending balance (in shares) at Dec. 31, 2022   28,900,000        
Ending balance at Dec. 31, 2022 $ 1,108.7 $ 0.3 $ 1,820.0 $ 224.1 $ (128.5) $ (807.2)