Quarterly report [Sections 13 or 15(d)]

Shareholders' Deficit - Summary of Changes in Shareholders' Deficit (Detail)

v3.26.1
Shareholders' Deficit - Summary of Changes in Shareholders' Deficit (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Beginning balance $ (509.4) $ (801.1)
Issuance of common shares from exercise of SARs, restricted stock units, employee stock purchase plan, and other 0.4 0.3
Additional capital from share-based compensation 10.6 11.6
Repurchases of common shares (0.7) (2.2)
Net income (loss) 61.2 50.4
Foreign currency translation adjustment, net of income taxes (6.1) 8.7
Unrealized gain/loss on derivatives, net of income taxes (0.2) (3.7)
Other 10.0  
Ending balance (434.2) (736.0)
Common Shares [Member]    
Beginning balance 0.1 0.1
Issuance of common shares from exercise of SARs, restricted stock units, employee stock purchase plan, and other 0.0 0.0
Repurchases of common shares 0.0 0.0
Other 0.0  
Ending balance 0.1 0.1
Paid-in Capital in Excess of par Value [Member]    
Beginning balance 316.0 278.2
Issuance of common shares from exercise of SARs, restricted stock units, employee stock purchase plan, and other 0.4 0.3
Additional capital from share-based compensation 10.6 11.6
Repurchases of common shares (0.7) (2.2)
Other 7.7  
Ending balance 334.0 287.9
Accumulated Other Comprehensive Loss [Member]    
Beginning balance (251.5) (271.4)
Foreign currency translation adjustment, net of income taxes (6.1) 8.7
Unrealized gain/loss on derivatives, net of income taxes (0.2) (3.7)
Ending balance (257.8) (266.4)
Accumulated Deficit [Member]    
Beginning balance (579.7) (808.0)
Repurchases of common shares 0.0 0.0
Net income (loss) 61.9 50.4
Ending balance (517.8) $ (757.6)
Total Herbalife Shareholders' Deficit [Member]    
Beginning balance (515.1)  
Issuance of common shares from exercise of SARs, restricted stock units, employee stock purchase plan, and other 0.4  
Additional capital from share-based compensation 10.6  
Repurchases of common shares (0.7)  
Net income (loss) 61.9  
Foreign currency translation adjustment, net of income taxes (6.1)  
Unrealized gain/loss on derivatives, net of income taxes (0.2)  
Other 7.7  
Ending balance (441.5)  
Noncontrolling Interest [Member]    
Beginning balance 5.7  
Net income (loss) (0.7)  
Other 2.3  
Ending balance $ 7.3