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EARNINGS PER SHARE
 6 Months Ended
Jun. 30, 2024
Earnings Per Share [Abstract]  
EARNINGS PER SHARE
NOTE 5. EARNINGS PER SHARE
Basic and diluted net income attributable to Olin Corporation per share are computed by dividing net income attributable to Olin Corporation by the weighted-average number of common shares outstanding. Diluted net income attributable to Olin Corporation per share reflects the dilutive effect of stock-based compensation.
 Three Months Ended June 30,Six Months Ended June 30,
 2024202320242023
Computation of Net Income per Share($ in millions, except per share data)
Net income attributable to Olin Corporation$74.2 $146.9 $122.8 $303.2 
Basic shares118.5 127.4 119.1 129.2 
Basic net income attributable to Olin Corporation per share$0.63 $1.15 $1.03 $2.35 
Diluted shares:
Basic shares118.5 127.4 119.1 129.2 
Stock-based compensation1.7 3.0 1.9 3.2 
Diluted shares120.2 130.4 121.0 132.4 
Diluted net income attributable to Olin Corporation per share$0.62 $1.13 $1.01 $2.29 
The computation of dilutive shares does not include 2.0 million shares for both the three and six months ended June 30, 2024 and 1.3 million shares for both the three and six months ended June 30, 2023 as their effect would have been anti-dilutive.