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

Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Additional Information (Detail)

Long-Term Debt - Additional Information (Detail)					1 Months Ended				3 Months Ended			6 Months Ended
Long-Term Debt - Additional Information (Detail)	Feb. 10, 2021	Mar. 19, 2020 USD ($)	Dec. 12, 2019 USD ($)	Aug. 16, 2018 USD ($)	May 31, 2021 USD ($)	May 31, 2020 USD ($)	Aug. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / shares	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) Days $ / shares	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Outstanding principal amount									$ 2,877,700,000			$ 2,877,700,000
Loss on extinguishment of debt												24,600,000	$ 0
Borrowings under the senior secured credit facility									1,117,000,000.0			1,117,000,000.0			$ 976,500,000
Interest expense									37,800,000	$ 30,500,000		76,700,000	59,400,000
Paid-in-capital in excess of par value									306,100,000			306,100,000			342,300,000
Long-term debt									2,779,200,000			2,779,200,000			2,428,400,000
Letters of credit issued but undrawn									41,700,000			41,700,000
2.625% Convertible Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Outstanding principal amount								$ 550,000,000.0	550,000,000.0			550,000,000.0			550,000,000.0
Deferred financing costs								12,900,000
Aggregate principal amount of convertible senior notes issued								$ 550,000,000.0
Interest expense									9,900,000	9,400,000		19,600,000	18,600,000
Non-cash interest expense									5,900,000	5,400,000		11,600,000	10,700,000
Amortization of deferred financing costs									$ 400,000	300,000		$ 800,000	700,000
Convertible notes, interest rate								2.625%	2.625%			2.625%
Convertible notes maturity								Mar. 15, 2024				May 15, 2024
Principal amount of convertible notes								$ 1,000				$ 1,000
Convertible notes conversion rate								16.0056				16.0467
Convertible notes conversion price \| $ / shares								$ 62.48	$ 62.32			$ 62.32
Paid-in-capital in excess of par value								$ 139,900,000
Long-term debt								$ 410,100,000
Effective interest rate on convertible notes								8.40%
Fair value of liability to convertible notes									$ 550,500,000			$ 550,500,000			541,800,000
Convertible notes, conversion feature												Holders of the 2024 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending June 30, 2018, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2024 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2024 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2024 Convertible Notes for each such day; (iii) if the Company calls the 2024 Convertible Notes for redemption; or (iv) upon the occurrence of specified corporate events. On and after December 15, 2023, holders may convert their 2024 Convertible Notes at any time, regardless of the foregoing circumstances.
Convertible notes, number of trading days of threshold limit (whether or not consecutive) \| Days												20
Convertible notes, number of trading days of threshold limit in consecutive days \| Days												30
Minimum percentage of common share price over conversion price for conversion								130.00%
Minimum percentage of the product of common share price and conversion rate for convertible notes								98.00%
Deferred financing costs recorded as additional paid-in-capital in excess of par value								$ 3,300,000
Unamortized debt discount and debt issuance costs									77,000,000.0			$ 77,000,000.0			89,400,000
Convertible senior notes, carrying value of liability component									473,000,000.0			473,000,000.0			460,600,000
2.625% Convertible Senior Notes Due 2024 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs								$ 9,600,000
7.875% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									600,000,000.0			600,000,000.0			600,000,000.0
Deferred financing costs									6,500,000	7,900,000		6,500,000	7,900,000		7,100,000
Aggregate principal amount of convertible senior notes issued						$ 600,000,000.0
Interest expense									12,200,000	4,300,000		24,300,000	4,300,000
Amortization of deferred financing costs									$ 300,000	100,000		$ 600,000	100,000
Convertible notes, interest rate						7.875%			7.875%			7.875%
Convertible notes maturity						Sep. 01, 2025						Sep. 01, 2025
Senior notes, redemption price, percentage						100.00%
Senior notes, redemption price percentage with equity offerings						107.875%
Carrying amount									$ 593,500,000			$ 593,500,000			592,900,000
7.875% Senior Notes Due 2025 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs										7,900,000			7,900,000
7.875% Senior Notes Due 2025 [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Fair value of notes									653,900,000			653,900,000			656,300,000
7.875% Senior Notes Due 2025 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount of senior notes being redeemed						40.00%
7.250% Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Outstanding principal amount															400,000,000.0
Deferred financing costs															4,100,000	$ 5,400,000
Aggregate principal amount of convertible senior notes issued							$ 400,000,000.0
Proceed to redeem senior notes					$ 400,000,000.0
Credit facility, amount borrowed					428,500,000
Loss on extinguishment of debt									(24,600,000)
Interest expense									4,100,000	7,400,000		11,500,000	14,800,000
Amortization of deferred financing costs									$ 100,000	200,000		$ 200,000	300,000
Convertible notes, interest rate							7.25%		7.25%			7.25%
Convertible notes maturity							Aug. 15, 2026					Aug. 15, 2026
Accrued interest					7,700,000
Senior notes, redemption price, percentage							100.00%
Senior notes, redemption price percentage with equity offerings							107.25%
Carrying amount															395,900,000
Fair value of notes															$ 425,000,000.0
7.250% Senior Notes Due 2026 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs																$ 5,400,000
7.250% Senior Notes Due 2026 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount of senior notes being redeemed							40.00%
4.875% Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									$ 600,000,000.0			$ 600,000,000.0
Deferred financing costs									7,700,000			7,700,000
Aggregate principal amount of convertible senior notes issued					$ 600,000,000.0
Interest expense									3,400,000			3,400,000
Amortization of deferred financing costs									$ 100,000			$ 100,000
Convertible notes, interest rate					4.875%				4.875%			4.875%
Convertible notes maturity					Jun. 01, 2029							Jun. 01, 2029
Unamortized debt discount and debt issuance costs									$ 7,600,000			$ 7,600,000
Senior notes, redemption price, percentage					100.00%
Senior notes, redemption price percentage with equity offerings					104.875%
Carrying amount									592,400,000			592,400,000
Fair value of notes									605,300,000			605,300,000
4.875% Senior Notes Due 2029 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs									7,700,000			7,700,000
4.875% Senior Notes Due 2029 [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Percentage of aggregate principal amount of senior notes being redeemed					40.00%
Eurodollar [Member]
Debt Instrument [Line Items]
Base rate interest rate floor				0.00%
2018 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings under the senior secured credit facility									$ 150,000,000.0			150,000,000.0
2017 Credit Facility [Member] \| 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Repayment of prior senior secured credit facility				$ 1,178,100,000
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount				1,250,000,000
Deferred financing costs			$ 1,200,000	11,700,000										$ 1,100,000
Credit facility, amount borrowed												345,000,000.0	30,400,000
Credit facility, amount repaid												$ 205,400,000	10,400,000
Long-term debt, weighted average interest rate									2.69%			2.69%			3.39%
Borrowings under the senior secured credit facility									$ 1,124,400,000			$ 1,124,400,000			$ 984,700,000
Interest expense									7,900,000	8,900,000		17,200,000	21,200,000
Non-cash interest expense									100,000	100,000		200,000	100,000
Amortization of deferred financing costs									400,000	$ 500,000		$ 900,000	$ 900,000
2018 Credit Facility [Member] \| 2024 Convertible Notes Exceeds 350 Million [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Outstanding principal amount		$ 350,000,000.0		$ 350,000,000.0
2018 Credit Facility [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Debt Modification Costs		1,600,000
Deferred financing costs		1,100,000
Credit facility amendment date												Mar. 19, 2020
Recognized in interest expense, net											$ 500,000
2018 Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Base rate interest rate floor				1.00%
2018 Credit Facility [Member] \| Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate				0.50%
2018 Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate				1.00%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount				$ 250,000,000.0
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage				0.35%
Borrowings under the senior secured credit facility									150,000,000.0			$ 150,000,000.0			0
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Second Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount		$ 250,000,000.0
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Second Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount									282,500,000			$ 282,500,000
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Eurodollar [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												2.50%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												1.50%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												1.50%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member]
Debt Instrument [Line Items]
Outstanding principal amount				$ 250,000,000.0
Credit facility, maturity date		Aug. 16, 2023
Borrowings under the senior secured credit facility									245,000,000.0			$ 245,000,000.0			251,600,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									244,000,000.0			244,000,000.0			250,500,000
Debt instrument, fair value									243,900,000			$ 243,900,000			251,900,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| 2024 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date												Sep. 15, 2023
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Credit facility, maturity date												Mar. 19, 2025
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Second Amendment [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount		$ 234,400,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Second Amendment [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount									264,800,000			$ 264,800,000
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Eurodollar [Member] \| Second Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												2.50%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| 2018 Revolving Credit Facility [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate		3.00%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate		2.00%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member]
Debt Instrument [Line Items]
Outstanding principal amount				$ 750,000,000.0
Credit facility, maturity date												Aug. 18, 2025
Senior secured credit facility, discount percentage				0.25%
Senior secured credit facility, discount amount				$ 1,900,000
Borrowings under the senior secured credit facility									729,400,000			$ 729,400,000			733,100,000
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									723,000,000.0			723,000,000.0			726,000,000.0
Debt instrument, fair value									$ 726,200,000			$ 726,200,000			$ 734,000,000.0
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| 2024 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date												Dec. 15, 2023
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	2.75%		2.75%	3.25%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Eurodollar [Member] \| Third Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												2.50%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	1.75%		1.75%	2.25%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Base Rate [Member] \| Third Amendment [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												1.50%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of convertible senior notes issued				$ 400,000,000.0