Quarterly report pursuant to Section 13 or 15(d)

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

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Segment Information - Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue from External Customer [Line Items]        
Total Net Sales $ 1,162.3 $ 1,306.2 $ 2,267.7 $ 2,568.8
Weight Management [Member]        
Revenue from External Customer [Line Items]        
Total Net Sales 752.1 843.5 1,456.0 1,651.1
Targeted Nutrition [Member]        
Revenue from External Customer [Line Items]        
Total Net Sales 261.0 286.1 512.9 570.1
Energy, Sports and Fitness [Member]        
Revenue from External Customer [Line Items]        
Total Net Sales 62.6 68.9 122.7 135.6
Outer Nutrition [Member]        
Revenue from External Customer [Line Items]        
Total Net Sales 32.0 47.0 67.4 86.7
Literature, Promotional and Other [Member]        
Revenue from External Customer [Line Items]        
Total Net Sales $ 54.6 $ 60.7 $ 108.7 $ 125.3