Annual report pursuant to Section 13 and 15(d)

Segment Information - Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services (Detail)

v3.22.0.1
Segment Information - Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenue from External Customer [Line Items]      
Total net sales $ 5,802.8 $ 5,541.8 $ 4,877.1
Weight Management [Member]      
Revenue from External Customer [Line Items]      
Total net sales 3,370.4 3,312.8 3,012.5
Targeted Nutrition [Member]      
Revenue from External Customer [Line Items]      
Total net sales 1,636.6 1,527.4 1,278.5
Energy, Sports, and Fitness [Member]      
Revenue from External Customer [Line Items]      
Total net sales 551.8 437.4 352.0
Outer Nutrition [Member]      
Revenue from External Customer [Line Items]      
Total net sales 107.8 111.3 97.3
Literature, Promotional and Other [Member]      
Revenue from External Customer [Line Items]      
Total net sales $ 136.2 $ 152.9 $ 136.8