v3.26.3
CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Parent
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2024     $ 115.7 $ 0.0 $ (450.1) $ 2,357.5 $ 32.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock repurchased and retired $ (40.4)   (1.7) (17.4)   (21.3)  
Stock Issued During Period, Value, Stock Options Exercised 2.1   0.0 2.1      
Common stock issued for other transactions     0.1 4.4      
Stock-based compensation       10.9      
Other comprehensive income (loss), net of tax (12.1)       (12.1)    
Common stock dividends paid           (68.8)  
Net income (loss) attributable to Olin Corporation 42.9         42.9  
Net income (loss) attributable to noncontrolling interests (0.8)           (0.8)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders             0.0
Distributions to noncontrolling interests 0.0            
Balance at end of period at Sep. 30, 2025 $ 1,993.7 $ 1,962.2 114.1 0.0 (462.2) 2,310.3 31.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per share of common stock $ 0.60            
Balance at beginning of period at Jun. 30, 2025     114.6 0.0 (451.4) 2,294.0 30.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock repurchased and retired     (0.5) (5.9)   (3.7)  
Stock Issued During Period, Value, Stock Options Exercised     0.0 0.2      
Common stock issued for other transactions     0.0 0.0      
Stock-based compensation       5.7      
Other comprehensive income (loss), net of tax $ (10.8)       (10.8)    
Common stock dividends paid           (22.8)  
Net income (loss) attributable to Olin Corporation 42.8         42.8  
Net income (loss) attributable to noncontrolling interests 0.9           0.9
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders             0.0
Balance at end of period at Sep. 30, 2025 $ 1,993.7 1,962.2 114.1 0.0 (462.2) 2,310.3 31.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per share of common stock $ 0.20            
Balance at beginning of period at Dec. 31, 2025 $ 1,870.6   113.6 0.0 (414.5) 2,139.8 31.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock repurchased and retired     0.0 0.0   0.0  
Stock Issued During Period, Value, Stock Options Exercised 3.0   0.2 2.8      
Common stock issued for other transactions     0.2 7.2      
Stock-based compensation       7.6      
Other comprehensive income (loss), net of tax 12.0       12.0    
Common stock dividends paid           (68.3)  
Net income (loss) attributable to Olin Corporation (81.9)         (81.9)  
Net income (loss) attributable to noncontrolling interests 0.0           0.0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders             (31.3)
Distributions to noncontrolling interests (31.3)            
Balance at end of period at Sep. 30, 2026 $ 1,719.1 1,718.7 114.0 17.6 (402.5) 1,989.6 0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per share of common stock $ 0.60            
Balance at beginning of period at Jun. 30, 2026     114.0 11.9 (412.4) 1,997.9 0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock repurchased and retired     0.0 0.0   0.0  
Stock Issued During Period, Value, Stock Options Exercised     0.0 0.0      
Common stock issued for other transactions     0.0 0.4      
Stock-based compensation       5.3      
Other comprehensive income (loss), net of tax $ 9.9       9.9    
Common stock dividends paid           (22.7)  
Net income (loss) attributable to Olin Corporation 14.4         14.4  
Net income (loss) attributable to noncontrolling interests 0.0           0.0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders             0.0
Balance at end of period at Sep. 30, 2026 $ 1,719.1 $ 1,718.7 $ 114.0 $ 17.6 $ (402.5) $ 1,989.6 $ 0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per share of common stock $ 0.20