Quarterly report pursuant to Section 13 or 15(d)

Contingencies - Additional Information (Detail)

v3.21.2
Contingencies - Additional Information (Detail)
$ in Millions
 9 Months Ended 12 Months Ended
Aug. 23, 2018
Plaintiff
Sep. 30, 2021
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2018
USD ($)
Aug. 31, 2017
USD ($)
Jul. 31, 2016
USD ($)
Loss Contingencies [Line Items]                
Other assets   $ 281.5   $ 273.5        
Prepaid expenses and other current assets   203.1   145.7        
Deductible for product liability insurance   $ 12.5            
Putative Class Plaintiffs [Member]                
Loss Contingencies [Line Items]                
Number of plaintiffs | Plaintiff 4              
Pending Litigation due to Plaintiffs Arbitration [Member]                
Loss Contingencies [Line Items]                
Number of plaintiffs | Plaintiff 4              
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            
Federal Revenue Office of Brazil [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   $ 10.2            
Selling, General and Administrative Expenses [Member] | SEC and DOJ Investigation [Member]                
Loss Contingencies [Line Items]                
Accrued liability     $ 40.0 $ 83.0        
Mexican Tax Administration Service [Member]                
Loss Contingencies [Line Items]                
Other assets current and non current   25.5            
Other assets   22.0            
Prepaid expenses and other current assets   3.5            
Mexican Tax Administration Service [Member] | Selling, General and Administrative Expenses [Member]                
Loss Contingencies [Line Items]                
Recognized loss related to tax matters     $ 19.0          
Brazilian ICMS [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   5.3            
Surety bond through insurance company to guarantee payment of tax assessment   9.3            
Brazilian ICMS [Member] | State of Sao Paulo [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service             $ 11.0 $ 29.6
Brazilian ICMS [Member] | State of Rio de Janeiro [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service           $ 6.5    
Indian VAT Authorities [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   14.2            
Indian VAT Authorities [Member] | Audit Period Fiscal Year March 31, 2017 [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   13.4            
Indian VAT Authorities [Member] | Audit Period Fiscal Year March 31 2018 [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   13.9            
South Korean Customs Authority [Member] | Other Noncurrent Assets [Member] | Audit Period January 2011 through May 2013 [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   30.0            
South Korean Customs Authority [Member] | Other Noncurrent Assets [Member] | Audit Period May 2013 through December 2013 [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   9.8            
South Korean Customs Authority [Member] | Other Noncurrent Assets [Member] | Audit Period January 2014 through December 2014 [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   15.2            
South Korean Customs Authority [Member] | Other Noncurrent Assets [Member] | Audit Period January 2015 Through December 2017 [Member]                
Loss Contingencies [Line Items]                
Assessment amount from tax administration service   $ 12.3