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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income (loss) $ 14.4 $ 43.7 $ (81.9) $ 42.1
Other comprehensive income (loss), net of tax:        
Foreign currency translation 5.1 (9.6) 7.8 (13.0)
Cash flow hedges (2.2) (2.2) 3.6 2.2
Pension and postretirement benefits 2.6 1.0 7.8 3.1
Total other comprehensive income (loss), net of tax 9.9 (10.8) 12.0 (12.1)
Comprehensive income (loss) 24.3 32.9 (69.9) 30.0
Comprehensive income (loss) attributable to noncontrolling interests 0.0 0.9 0.0 (0.8)
Comprehensive income (loss) attributable to Olin Corporation $ 24.3 $ 32.0 $ (69.9) $ 30.8