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)

v3.3.1.900
Segment Information - Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenue from External Customer [Line Items]                      
Total Net Sales $ 1,098.4 $ 1,102.9 $ 1,162.3 $ 1,105.4 $ 1,133.6 $ 1,256.2 $ 1,306.2 $ 1,262.6 $ 4,469.0 $ 4,958.6 $ 4,825.3
Weight Management [Member]                      
Revenue from External Customer [Line Items]                      
Total Net Sales                 2,862.8 3,177.0 3,063.7
Targeted Nutrition [Member]                      
Revenue from External Customer [Line Items]                      
Total Net Sales                 1,015.4 1,108.5 1,109.9
Energy, Sports & Fitness [Member]                      
Revenue from External Customer [Line Items]                      
Total Net Sales                 250.9 260.6 254.5
Outer Nutrition [Member]                      
Revenue from External Customer [Line Items]                      
Total Net Sales                 133.0 178.9 157.2
Literature, Promotional and Other [Member]                      
Revenue from External Customer [Line Items]                      
Total Net Sales                 $ 206.9 $ 233.6 $ 240.0