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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
$0.001 Par Value Common Stock
Additional Paid-In Capital
Treasury Stock
Accumulated Other Comprehensive Income (Loss)
Retained Earnings (Accumulated Deficit)
Beginning balance (in shares) at Dec. 31, 2020   54.3        
Beginning balance at Dec. 31, 2020 $ 1,450.9 $ 0.1 $ 784.9 $ (39.6) $ (25.3) $ 730.8
Beginning balance (in shares) at Dec. 31, 2020       (1.2)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 219.5         219.5
Other comprehensive income, net of tax 9.2       9.2  
Share-based compensation activity (in shares)   0.8        
Share-based compensation activity 44.5   44.5      
Repurchases of stock (in shares)       (2.6)    
Repurchases of common stock (112.6)     $ (112.6)    
Ending balance (in shares) at Dec. 31, 2021   55.1        
Ending balance at Dec. 31, 2021 1,611.5 $ 0.1 829.4 $ (152.2) (16.1) 950.3
Ending balance (in shares) at Dec. 31, 2021       (3.8)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (211.6)         (211.6)
Other comprehensive income, net of tax 19.2       19.2  
Share-based compensation activity (in shares)   0.6        
Share-based compensation activity 44.1   44.1      
Repurchases of stock (in shares)       (1.8)    
Repurchases of common stock $ (75.5)     $ (75.5)    
Ending balance (in shares) at Dec. 31, 2022 55.7 55.7        
Ending balance at Dec. 31, 2022 $ 1,387.7 $ 0.1 873.5 $ (227.7) 3.1 738.7
Ending balance (in shares) at Dec. 31, 2022 (5.6)     (5.6)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) $ (760.5)         (760.5)
Other comprehensive income, net of tax (8.8)       (8.8)  
Share-based compensation activity (in shares)   1.0        
Share-based compensation activity 22.5   22.5      
At-the-market sale of stock, net of commissions and expenses (in shares)   1.1        
At-the-market sale of stock, net of commissions and expenses $ 8.4   8.4      
Ending balance (in shares) at Dec. 31, 2023 57.8 57.8        
Ending balance at Dec. 31, 2023 $ 649.3 $ 0.1 $ 904.4 $ (227.7) $ (5.7) $ (21.8)
Ending balance (in shares) at Dec. 31, 2023 (5.6)     (5.6)