v3.25.3
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, 2023     $ 120.2 $ 24.8 $ (496.3) $ 2,583.7 $ 35.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock repurchased and retired $ (256.8)   (4.9) (47.5)   (204.4)  
Stock Issued During Period, Value, Stock Options Exercised 22.6   0.9 21.7      
Common stock issued for other transactions     0.4 (4.0)      
Stock-based compensation       5.0      
Other comprehensive (loss) income, net of tax 30.1       30.1    
Common stock dividends paid           (70.9)  
Net income (loss) attributable to Olin Corporation 97.9         97.9  
Net income (loss) attributable to noncontrolling interests (3.0)           (3.0)
Balance at end of period at Sep. 30, 2024 $ 2,089.6 $ 2,056.7 116.6 0.0 (466.2) 2,406.3 32.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per share of common stock $ 0.60            
Balance at beginning of period at Jun. 30, 2024     117.5 0.0 (474.0) 2,492.6 33.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Common stock repurchased and retired     (1.0) (6.3)   (38.1)  
Stock Issued During Period, Value, Stock Options Exercised     0.1 0.8      
Common stock issued for other transactions     0.0 0.2      
Stock-based compensation       5.3      
Other comprehensive (loss) income, net of tax $ 7.8       7.8    
Common stock dividends paid           (23.3)  
Net income (loss) attributable to Olin Corporation (24.9)         (24.9)  
Net income (loss) attributable to noncontrolling interests (0.3)           (0.3)
Balance at end of period at Sep. 30, 2024 $ 2,089.6 2,056.7 116.6 0.0 (466.2) 2,406.3 32.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared per share of common stock $ 0.20            
Balance at beginning of period at Dec. 31, 2024 $ 2,055.4   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 (loss) income, 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)
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 (loss) income, 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
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