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CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net loss $ (13.3) $ (2.8) $ (96.3) $ (1.6)
Other comprehensive income (loss), net of tax:        
Foreign currency translation 1.8 (2.2) 2.7 (3.4)
Cash flow hedges 1.4 (19.8) (5.8) 0.0
Pension and postretirement benefits 2.8 1.2 5.2 2.1
Total other comprehensive income (loss), net of tax 6.0 (20.8) 2.1 (1.3)
Comprehensive loss (7.3) (23.6) (94.2) (2.9)
Comprehensive loss attributable to noncontrolling interests 0.0 (1.5) 0.0 (1.7)
Comprehensive loss attributable to Olin Corporation $ (7.3) $ (22.1) $ (94.2) $ (1.2)