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Consolidated Statement Of Stockholders' Equity - USD ($)
$ in Millions
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Paid-in Capital
Accumulated Deficit
Accumulated Deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2019     143,000,000.0        
Beginning balance at Dec. 31, 2019 $ 960.3 $ 0.5 $ 1.4 $ 3,095.3 $ (2,018.6) $ 0.5 $ (117.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 788.5       788.5    
Equity-based compensation expense 42.5     42.5      
Stock option exercises (in shares)     1,400,000        
Stock option exercises 49.2     49.2      
Coworker Stock Purchase Plan (in shares)     100,000        
Coworker Stock Purchase Plan 16.8     16.8      
Repurchases of common stock (in shares)     (2,600,000)        
Repurchases of common stock (340.6)       (340.6)    
Dividend payments (219.6)     1.1 (220.7)    
Incentive compensation plan stock withheld for taxes (22.5)     0.0 (22.5)    
Unrealized gain on cash flow hedge (0.6)           (0.6)
Reclassification of cash flow hedge to net income 6.0           6.0
Foreign currency translation 16.6           16.6
Ending balance (in shares) at Dec. 31, 2020     141,900,000        
Ending balance at Dec. 31, 2020 $ 1,297.1 $ 19.2 $ 1.4 3,204.9 (1,813.4) $ 19.2 (95.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible List] Accounting Standards Update 2016-13 [Member]            
Net income $ 988.6       988.6    
Equity-based compensation expense 72.6     72.6      
Stock option exercises (in shares)     1,500,000        
Stock option exercises 69.9     69.9      
Coworker Stock Purchase Plan (in shares)     100,000        
Coworker Stock Purchase Plan 20.6     20.6      
Repurchases of common stock (in shares)     (8,700,000)        
Repurchases of common stock (1,500.4)   $ (0.1)   (1,500.3)    
Dividend payments (234.8)     1.5 (236.3)    
Incentive compensation plan stock withheld for taxes (28.5)       (28.5)    
Unrealized gain on cash flow hedge 0.0            
Reclassification of cash flow hedge to net income 2.5           2.5
Foreign currency translation (1.1)           (1.1)
Ending balance (in shares) at Dec. 31, 2021     134,800,000        
Ending balance at Dec. 31, 2021 $ 705.7   $ 1.3 3,369.5 (2,570.7)   (94.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Standards Update [Extensible List] Accounting Standards Update 2019-12 [Member]            
Net income $ 1,114.5       1,114.5    
Equity-based compensation expense $ 91.1     91.1      
Stock option exercises (in shares) 393,819   500,000        
Stock option exercises $ 30.2   $ 0.1 30.1      
Coworker Stock Purchase Plan (in shares)     200,000        
Coworker Stock Purchase Plan 25.5     25.5      
Dividend payments (282.6)     1.9 (284.5)    
Incentive compensation plan stock withheld for taxes (23.1)       (23.1)    
Unrealized gain on cash flow hedge (0.1)           (0.1)
Reclassification of cash flow hedge to net income 3.6           3.6
Foreign currency translation (61.5)           (61.5)
Ending balance (in shares) at Dec. 31, 2022     135,500,000        
Ending balance at Dec. 31, 2022 $ 1,603.3   $ 1.4 $ 3,518.1 $ (1,763.8)   $ (152.4)