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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Statement of Comprehensive Income [Abstract]        
Net loss $ (405.7) $ (402.2) $ (447.9) $ (280.9)
Other comprehensive income (loss):        
Foreign currency translation adjustment (25.4) 119.5 (12.2) (41.9)
Net unrealized derivative gain (loss) on cash flow hedges, net of taxes of $0.3 and $0.8, and $0.3 and $0.9 during the three and nine months ended, respectively (0.2) (1.7) 0.6 (2.2)
Pension and other post-employment benefits adjustment, net of tax of $0.6 and $(0.4), and $3.3 and $0.5 during the three and nine months ended, respectively (2.0) 0.6 (1.7) (1.7)
Total other comprehensive (loss) income, net of tax (27.6) 118.4 (13.3) (45.8)
Comprehensive loss (433.3) (283.8) (461.2) (326.7)
Comprehensive income attributable to noncontrolling interests:        
Net income 3.2 2.0 7.8 5.7
Foreign currency translation adjustment (0.2) 0.0 (0.4) (0.2)
Total comprehensive income attributable to noncontrolling interests 3.0 2.0 7.4 5.5
Comprehensive income attributable to redeemable noncontrolling interests:        
Net (loss) income (0.8) 1.5 8.1 12.5
Foreign currency translation adjustment (0.1) 0.2 (0.1) 0.1
Total comprehensive income attributable to redeemable noncontrolling interests (0.9) 1.7 8.0 12.6
Comprehensive loss attributable to Coty Inc. $ (435.4) $ (287.5) $ (476.6) $ (344.8)