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

Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Deficit - Additional Information (Detail)

Shareholders' Deficit - Additional Information (Detail) - USD ($)			1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020	Oct. 30, 2018	Aug. 31, 2020	Feb. 28, 2014	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2014	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019
Stockholders Equity [Line Items]
Share repurchase program authorized amount	$ 1,500,000,000	$ 1,500,000,000			$ 1,500,000,000			$ 1,500,000,000
Share repurchase program, remaining authorized capacity	682,900,000	$ 113,300,000			682,900,000			$ 682,900,000
Share repurchase program expiration date		Feb. 21, 2020						Oct. 30, 2023
Forward counterparties shares purchased and subsequently retired						4,000,000.0			6,000,000.0
Accumulated deficit	$ (690,200,000)				(690,200,000)			$ (690,200,000)			$ (215,300,000)
Shares repurchases, value					$ 819,100,000	$ 900,000		$ 845,100,000	$ 9,900,000
Treasury stock shares, at cost	10,000,000.0				10,000,000.0			10,000,000.0			10,000,000.0
Repurchase of common stock, shares					16,800,000	100,000		17,400,000	200,000
Shares repurchases, inclusive of transaction costs and issuance of CVR value								$ 818,500,000	$ 0
Withheld for tax purpose for share-based compensation plans								26,600,000	9,900,000
Share repurchases for which subsequent payment to be made	$ 900,000				$ 900,000			900,000
Share repurchases								844,200,000	9,900,000
Other comprehensive income (loss) before foreign currency translation adjustments reclassifications, tax expense (benefit)					(700,000)	$ (100,000)		(4,100,000)	(1,100,000)
Other comprehensive income (Loss), reclassification adjustment from AOCI on derivatives, net of tax expense (benefit)					$ (100,000)			100,000
Other comprehensive loss before unrealized gain (loss) on derivatives adjustments reclassifications, tax expense (benefit)								$ (500,000)
Capped call transactions [Member]
Stockholders Equity [Line Items]
Capped call transactions with financial institutions				$ 123,800,000
Capped call transactions price per common share				$ 60.39
Increase (decrease) in additional paid-in capital, other							$ (123,800,000)
Terminating result of portion of capped call transactions cash received										$ 55,900,000
Capped call transactions [Member] \| Convertible Senior Notes Due 2019 [Member]
Stockholders Equity [Line Items]
Convertible notes conversion price				$ 43.14
Prepaid forward share repurchase transactions [Member]
Stockholders Equity [Line Items]
Forward share repurchase transactions amount				$ 685,800,000			685,800,000
Forward transactions, shares to be purchased				19,900,000
Average cost per share of shares repurchased				$ 34.51
Settlement date of forward transactions								Aug. 15, 2019
Forward counterparties shares purchased and subsequently retired	19,900,000
Shares outstanding under forward purchasing transactions	0				0			0
Accumulated deficit							(653,900,000)
Additional paid-in-capital							(31,900,000)
Non-cash forward transaction issuance costs							$ 35,800,000
Non-cash interest expense relating to amortization of non-cash issuance costs						$ 200,000			$ 1,200,000
Open Market Repurchase Plan
Stockholders Equity [Line Items]
Average cost per share of shares repurchased								$ 46.44
Shares repurchases, value								$ 67,100,000
Repurchase of common stock, shares								1,400,000	0
August 2020 Dutch Auction Tender Offer [Member]
Stockholders Equity [Line Items]
Average cost per share of shares repurchased			$ 48.75
Repurchase of common stock, shares			15,400,000
Repurchase of common stock, value			$ 750,000,000.0