v3.25.2
Shareholders' Deficit - Summary of Changes in Shareholders' Deficit (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Beginning balance $ (736.0) $ (1,036.6) $ (801.1) $ (1,060.3)
Issuance of common shares from exercise of SARs, restricted stock units, employee stock purchase plan, and other 0.6 0.8 0.9 1.5
Additional capital from share-based compensation 10.4 11.8 22.0 23.7
Repurchases of common shares (4.6) (3.4) (6.8) (5.7)
Net income (loss) 49.2 4.7 99.6 29.0
Foreign currency translation adjustment, net of income taxes 24.2 (21.6) 32.9 (31.5)
Unrealized gain/loss on derivatives, net of income taxes (4.4) 7.1 (8.1) 6.1
Acquisition 6.2   6.2  
Ending balance (654.4) (1,037.2) (654.4) (1,037.2)
Common Shares [Member]        
Beginning balance 0.1 0.1 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 0.0 0.0
Repurchases of common shares 0.0 0.0 0.0 0.0
Ending balance 0.1 0.1 0.1 0.1
Paid-in Capital in Excess of par Value [Member]        
Beginning balance 287.9 244.2 278.2 233.9
Issuance of common shares from exercise of SARs, restricted stock units, employee stock purchase plan, and other 0.6 0.8 0.9 1.5
Additional capital from share-based compensation 10.4 11.8 22.0 23.7
Repurchases of common shares (4.6) (3.4) (6.8) (5.7)
Ending balance 294.3 253.4 294.3 253.4
Accumulated Other Comprehensive Loss [Member]        
Beginning balance (266.4) (242.9) (271.4) (232.0)
Foreign currency translation adjustment, net of income taxes 24.2 (21.6) 32.9 (31.5)
Unrealized gain/loss on derivatives, net of income taxes (4.4) 7.1 (8.1) 6.1
Ending balance (246.6) (257.4) (246.6) (257.4)
Accumulated Deficit [Member]        
Beginning balance (757.6) (1,038.0) (808.0) (1,062.3)
Repurchases of common shares 0.0 0.0 0.0 0.0
Net income (loss) 49.3 4.7 99.7 29.0
Ending balance (708.3) $ (1,033.3) (708.3) $ (1,033.3)
Total Herbalife Shareholders' Deficit [Member]        
Beginning balance (736.0)   (801.1)  
Issuance of common shares from exercise of SARs, restricted stock units, employee stock purchase plan, and other 0.6   0.9  
Additional capital from share-based compensation 10.4   22.0  
Repurchases of common shares (4.6)   (6.8)  
Net income (loss) 49.3   99.7  
Foreign currency translation adjustment, net of income taxes 24.2   32.9  
Unrealized gain/loss on derivatives, net of income taxes (4.4)   (8.1)  
Acquisition     0.0  
Ending balance (660.5)   (660.5)  
Noncontrolling Interest [Member]        
Beginning balance 0.0   0.0  
Net income (loss) (0.1)   (0.1)  
Acquisition 6.2   6.2  
Ending balance $ 6.1   $ 6.1