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EARNINGS PER SHARE
 3 Months Ended
Mar. 31, 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 March 31,
 20242023
Computation of Net Income per Share(In millions, except per share data)
Net income$47.8 $154.0 
Net loss attributable to noncontrolling interests(0.8)(2.3)
Net income attributable to Olin Corporation$48.6 $156.3 
Basic shares119.9 131.0 
Basic net income attributable to Olin Corporation per share$0.41 $1.19 
Diluted shares:
Basic shares119.9 131.0 
Stock-based compensation2.0 3.4 
Diluted shares121.9 134.4 
Diluted net income attributable to Olin Corporation per share$0.40 $1.16 
The computation of dilutive shares does not include 2.0 million and 1.4 million shares for the three months ended March 31, 2024 and 2023, respectively, as their effect would have been anti-dilutive.