Herbalife Ltd. Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Summary of Foreign Currency Forward Contracts Outstanding (Detail)

Derivative Instruments and Hedging Activities - Summary of Foreign Currency Forward Contracts Outstanding (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Buy Chinese yuan dollar sell Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	7.72
Original Notional Amount	$ 8.0
Fair Value Gain (Loss)	0.2
Buy Euro sell Australian dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	1.51	1.52
Original Notional Amount	4.9	4.5
Fair Value Gain (Loss)	(0.1)	0.1
Buy Euro sell Chilean peso [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	745.65	727.40
Original Notional Amount	1.1	1.1
Buy Euro sell Indonesian rupiah [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	15,302.91	16,915.00
Original Notional Amount	1.8	0.7
Buy Euro sell Mexican peso [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	18.04	17.51
Original Notional Amount	153.3	150.3
Fair Value Gain (Loss)	(0.4)	4.9
Buy Euro sell Malaysian ringgit [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	4.31
Original Notional Amount	0.7
Buy Euro sell Peruvian nuevo sol [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	3.66
Original Notional Amount	4.0
Buy Euro sell Philippine peso [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	55.39
Original Notional Amount	1.7
Buy Euro sell Russian ruble [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	69.82	45.05
Original Notional Amount	2.7	3.0
Fair Value Gain (Loss)	0.1
Buy Euro sell U.S. dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	1.23	1.37
Original Notional Amount	105.0	161.3
Fair Value Gain (Loss)	(2.0)
Buy British pound sell Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	0.80	1.01
Original Notional Amount	2.3	4.9
Fair Value Gain (Loss)		0.1
Buy Russian ruble sell Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	49.80
Original Notional Amount	2.8
Fair Value Gain (Loss)	(1.0)
Buy U.S. dollar sell Brazilian real [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	2.54	2.35
Original Notional Amount	10.4	12.8
Fair Value Gain (Loss)	0.9	0.6
Buy U.S. dollar sell Colombian peso [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	2,084.12
Original Notional Amount	4.8
Fair Value Gain (Loss)	0.6
Buy U.S. dollar sell Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	1.32	1.34
Original Notional Amount	132.6	171.8
Fair Value Gain (Loss)	10.7	(4.2)
Buy U.S. dollar sell South Korean won [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate	1,081.96	1,112.65
Original Notional Amount	7.7	50.0
Fair Value Gain (Loss)	0.1	1.5
Foreign exchange forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Original Notional Amount	443.8	593.7
Fair Value Gain (Loss)	9.1	2.9
Buy Australian dollar sell Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate		1.55
Original Notional Amount		2.7
Buy Euro sell British pound [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate		0.83
Original Notional Amount		2.5
Buy Euro sell Singapore dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate		1.74
Original Notional Amount		3.0
Buy Japanese yen sell U.S. dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate		104.71
Original Notional Amount		2.9
Buy Malaysian ringgit sell U.S. dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate		3.30
Original Notional Amount		5.3
Buy Singapore dollar sell Euro [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate		1.71
Original Notional Amount		2.0
Buy New Taiwan dollar sell U.S. dollar [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Average Contract Rate		29.54
Original Notional Amount		14.9
Fair Value Gain (Loss)		$ (0.1)