Quarterly report pursuant to Section 13 or 15(d)

Contingencies - Additional Information (Detail)

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Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]            
Other assets $ 323.3   $ 308.4      
Prepaid expenses and other current assets 238.1   237.7      
Current assets 1,226.2   1,399.3      
Assessment amount from tax administration service 11.3          
Selling, general, and administrative expenses [1] 492.2 $ 475.9        
Deductible for product liability insurance 12.5          
Surety Bond [Member]            
Loss Contingencies [Line Items]            
Surety bond $ 45.0          
SEC and DOJ Investigation [Member]            
Loss Contingencies [Line Items]            
Accrued liability         $ 123.0  
Loss contingency compliance self-reporting obligations term three-year          
Herbalife International of America, Inc., [Member] | U.S. Federal Trade Commission [Member]            
Loss Contingencies [Line Items]            
Settlement amount paid for consent order $ 200.0          
Third-party monitoring by independent compliance auditor, period 7 years          
Audit Period Fiscal Year March 31, 2017 [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service $ 17.4          
Audit Period Fiscal Year March 31 2018 [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service 16.9          
Audit Period Fiscal Year March 31, 2020 [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service 14.6          
Audit Period Fiscal Year March 31, 2021 [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service 16.5          
State of Sao Paulo [Member] | Brazilian I C M S Two Thousand Thirteen [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service 32.1          
State of Sao Paulo [Member] | Brazilian I C M S Two Thousand Fourteen [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service 11.9          
Selling, General and Administrative Expenses [Member] | SEC and DOJ Investigation [Member]            
Loss Contingencies [Line Items]            
Accrued liability       $ 83.0   $ 40.0
Mexican Tax Administration Service [Member]            
Loss Contingencies [Line Items]            
Other assets 23.1          
Prepaid expenses and other current assets 11.5          
Other assets current and non current 11.6          
Brazilian ICMS [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service 3.2          
Surety bond through insurance company to guarantee payment of tax assessment 12.6          
Brazilian ICMS [Member] | State of Sao Paulo [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service 29.1   $ 46.9      
Brazilian ICMS [Member] | State of Rio de Janeiro [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service 7.0          
Indian VAT Authorities [Member]            
Loss Contingencies [Line Items]            
Assessment amount from tax administration service $ 12.3          
[1] Contribution margin consists of net sales less cost of sales and Royalty overrides. For the China segment, contribution margin does not include the portion of service fees to China independent service providers included in selling, general, and administrative expenses, which totaled $36.8 million and $33.7 million for the three months ended March 31, 2024 and 2023, respectively.