Herbalife Ltd. Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Not Designated As Hedging Instruments Recorded to Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Foreign exchange currency contracts [Member] \| Derivatives not designated as hedging instruments [Member] \| Selling, general and administrative expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Gain Recognized in Income	$ 0.4	$ (0.7)	$ 0.2	$ (2.3)