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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Income (Loss)
(Accumulated Deficit) Retained Earnings
Beginning balance (in shares) at Dec. 31, 2022   55.7        
Beginning balance at Dec. 31, 2022 $ 1,387.7 $ 0.1 $ (227.7) $ 873.5 $ 3.1 $ 738.7
Beginning balance (in shares) at Dec. 31, 2022     (5.6)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (186.2)         (186.2)
Share-based compensation activity (in shares)   0.3        
Share-based compensation activity 4.7     4.7    
Other comprehensive income (loss), net of tax (2.1)       (2.1)  
Ending balance (in shares) at Mar. 31, 2023   56.0        
Ending balance at Mar. 31, 2023 1,204.1 $ 0.1 $ (227.7) 878.2 1.0 552.5
Ending balance (in shares) at Mar. 31, 2023     (5.6)      
Beginning balance (in shares) at Dec. 31, 2022   55.7        
Beginning balance at Dec. 31, 2022 1,387.7 $ 0.1 $ (227.7) 873.5 3.1 738.7
Beginning balance (in shares) at Dec. 31, 2022     (5.6)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (711.0)          
Other comprehensive income (loss), net of tax (5.7)          
Ending balance (in shares) at Sep. 30, 2023   57.4        
Ending balance at Sep. 30, 2023 697.2 $ 0.1 $ (227.7) 899.7 (2.6) 27.7
Ending balance (in shares) at Sep. 30, 2023     (5.6)      
Beginning balance (in shares) at Mar. 31, 2023   56.0        
Beginning balance at Mar. 31, 2023 1,204.1 $ 0.1 $ (227.7) 878.2 1.0 552.5
Beginning balance (in shares) at Mar. 31, 2023     (5.6)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (261.4)         (261.4)
Share-based compensation activity (in shares)   0.3        
Share-based compensation activity 9.4     9.4    
Issuance of common stock/At-the-market sale of stock, net of commissions and expenses (in shares)   1.1        
Issuance of common stock/At-the-market sale of stock, net of commissions and expenses 8.2     8.2    
Other comprehensive income (loss), net of tax (2.6)       (2.6)  
Ending balance (in shares) at Jun. 30, 2023   57.4        
Ending balance at Jun. 30, 2023 957.7 $ 0.1 $ (227.7) 895.8 (1.6) 291.1
Ending balance (in shares) at Jun. 30, 2023     (5.6)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (263.4)         (263.4)
Share-based compensation activity 3.9     3.9    
Other comprehensive income (loss), net of tax (1.0)       (1.0)  
Ending balance (in shares) at Sep. 30, 2023   57.4        
Ending balance at Sep. 30, 2023 $ 697.2 $ 0.1 $ (227.7) 899.7 (2.6) 27.7
Ending balance (in shares) at Sep. 30, 2023     (5.6)      
Beginning balance (in shares) at Dec. 31, 2023 57.8 57.8        
Beginning balance at Dec. 31, 2023 $ 649.3 $ 0.1 $ (227.7) 904.4 (5.7) (21.8)
Beginning balance (in shares) at Dec. 31, 2023 (5.6)   (5.6)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) $ 9.0         9.0
Share-based compensation activity (in shares)   0.2        
Share-based compensation activity 5.4     5.4    
Other comprehensive income (loss), net of tax 0.2       0.2  
Ending balance (in shares) at Mar. 31, 2024   58.0        
Ending balance at Mar. 31, 2024 $ 663.9 $ 0.1 $ (227.7) 909.8 (5.5) (12.8)
Ending balance (in shares) at Mar. 31, 2024     (5.6)      
Beginning balance (in shares) at Dec. 31, 2023 57.8 57.8        
Beginning balance at Dec. 31, 2023 $ 649.3 $ 0.1 $ (227.7) 904.4 (5.7) (21.8)
Beginning balance (in shares) at Dec. 31, 2023 (5.6)   (5.6)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) $ (159.3)          
Other comprehensive income (loss), net of tax $ (1.6)          
Ending balance (in shares) at Sep. 30, 2024 59.7 59.7        
Ending balance at Sep. 30, 2024 $ 508.4 $ 0.1 $ (227.7) 924.4 (7.3) (181.1)
Ending balance (in shares) at Sep. 30, 2024 (5.6)   (5.6)      
Beginning balance (in shares) at Mar. 31, 2024   58.0        
Beginning balance at Mar. 31, 2024 $ 663.9 $ 0.1 $ (227.7) 909.8 (5.5) (12.8)
Beginning balance (in shares) at Mar. 31, 2024     (5.6)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) (283.1)         (283.1)
Share-based compensation activity (in shares)   0.5        
Share-based compensation activity 5.5     5.5    
Other comprehensive income (loss), net of tax 0.0          
Ending balance (in shares) at Jun. 30, 2024   58.5        
Ending balance at Jun. 30, 2024 386.3 $ 0.1 $ (227.7) 915.3 (5.5) (295.9)
Ending balance (in shares) at Jun. 30, 2024     (5.6)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income (loss) 114.8         114.8
Share-based compensation activity (in shares)   0.1        
Share-based compensation activity 1.4     1.4    
Issuance of common stock/At-the-market sale of stock, net of commissions and expenses (in shares)   1.1        
Issuance of common stock/At-the-market sale of stock, net of commissions and expenses 7.7     7.7    
Other comprehensive income (loss), net of tax $ (1.8)       (1.8)  
Ending balance (in shares) at Sep. 30, 2024 59.7 59.7        
Ending balance at Sep. 30, 2024 $ 508.4 $ 0.1 $ (227.7) $ 924.4 $ (7.3) $ (181.1)
Ending balance (in shares) at Sep. 30, 2024 (5.6)   (5.6)