Herbalife Ltd. Annual report [Section 13 and 15(d), not S-K Item 405]

Annual report [Section 13 and 15(d), not S-K Item 405]

Long-Term Debt - Additional Information (Detail)

Long-Term Debt - Additional Information (Detail) $ / shares in Units, $ in Millions			1 Months Ended				3 Months Ended	12 Months Ended
	Apr. 12, 2024	Aug. 16, 2018 USD ($)	Jun. 30, 2025 USD ($)	Feb. 28, 2025 USD ($)	Apr. 30, 2024 USD ($)	May 31, 2020 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) Days $ / shares	Sep. 30, 2025 USD ($)	Jun. 30, 2021 USD ($)	May 31, 2021 USD ($)	Jun. 30, 2020 USD ($)
Debt Instrument [Line Items]
Outstanding principal amount								$ 2,050.0
Gain on extinguishment of debt								0.0	$ (10.5)	$ 1.0
Interest expense								214.4	218.3	165.9
Amortization of deferred financing costs								7.6	7.6	7.1
4.250% Convertible Senior Notes Due 2028 [Member]
Debt Instrument [Line Items]
Outstanding principal amount								$ 277.5	277.5		$ 277.5
Deferred financing costs											8.5
Aggregate principal amount of senior notes issued											$ 250.0
Line of credit maturity								Jun. 15, 2028			Jun. 15, 2028
Convertible debt underwriters over allotment option fully exercised											$ 37.5
Interest expense								$ 13.3	14.0	13.2
Amortization of deferred financing costs								$ 1.5	1.5	1.4
Additional principal amount of convertible notes											$ 27.5
Convertible notes, interest rate								4.25%			4.25%
Convertible notes conversion price \| $ / shares											$ 16.98
Effective interest rate on convertible notes											4.90%
Fair value of liability to convertible notes								$ 301.7	215.3
Convertible notes, conversion feature								Holders of the 2028 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending March 31, 2023, 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 2028 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 2028 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 2028 Convertible Notes for each such day; (iii) if the Company calls the 2028 Convertible Notes for redemption; or (iv) upon the occurrence of specified corporate events. On and after March 15, 2028, holders may convert their 2028 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%
Convertible notes conversion rate											58.8998
Principal amount of convertible notes											$ 1,000.0
Unamortized debt discount and debt issuance costs								$ 4.1	5.6
Convertible senior notes, carrying value								$ 273.4	271.9
7.875% Senior Notes Due 2025 [Member]
Debt Instrument [Line Items]
Outstanding principal amount									262.3
Deferred financing costs									0.5						$ 7.9
Aggregate principal amount of senior notes issued			$ 50.0	$ 65.0	$ 300.0	$ 600.0						$ 147.3
Debt instrument , Purchase Price			51.3	67.3	309.1
Accrued interest			$ 1.3	$ 2.3	3.2							$ 5.8
Reduction to long term debt					298.8
Gain on extinguishment of debt					7.1		$ 0.9
Line of credit maturity						Sep. 01, 2025		Sep. 01, 2025
Interest expense								$ 10.8	29.7	48.8
Amortization of deferred financing costs								$ 0.5	1.0	1.5
Convertible notes, interest rate						7.875%		7.875%
Carrying amount								$ 0.0	261.8
7.875% Senior Notes Due 2025 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs															$ 7.9
7.875% Senior Notes Due 2025 [Member] \| Level 2 [Member]
Debt Instrument [Line Items]
Fair value of notes									263.0
4.875% Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Outstanding principal amount								600.0	600.0
Deferred financing costs								$ 3.7	4.6				$ 7.7
Aggregate principal amount of senior notes issued														$ 600.0
Line of credit maturity						Jun. 01, 2029		Jun. 01, 2029
Interest expense								$ 30.2	30.2	30.1
Amortization of deferred financing costs								$ 1.0	0.9	0.9
Convertible notes, interest rate								4.875%						4.875%
Carrying amount								$ 596.3	595.4
Fair value of notes								$ 565.6	421.5
4.875% Senior Notes Due 2029 [Member] \| Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs													$ 7.7
2029 Secured Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of senior notes issued					800.0
SOFR
Debt Instrument [Line Items]
Base rate interest rate floor								0.00%
2018 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit maturity								Mar. 19, 2025
2024 Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	5.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.35%
2024 Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	6.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.45%
2024 Revolving Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	4.50%
2024 Revolving Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	5.50%
2018 Term Loan A [Member]
Debt Instrument [Line Items]
Line of credit maturity								Mar. 19, 2025
2018 Term Loan A [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate								0.75%
2018 Term Loan A [Member] \| 2018 Revolving Credit Facility [Member] \| Base Rate [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate								1.25%
2018 Term Loan A [Member] \| 2018 Revolving Credit Facility [Member] \| SOFR \| Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate								1.75%
2018 Term Loan A [Member] \| 2018 Revolving Credit Facility [Member] \| SOFR \| Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate								2.25%
2018 Term Loan B [Member]
Debt Instrument [Line Items]
Line of credit maturity								Aug. 18, 2025
Separately 2025 Senior Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of senior notes issued					37.7
Debt instrument , Purchase Price					38.9
Accrued interest					0.5
Senior notes carrying value					$ 37.5
2024 Term Loan B [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					5.75%
2024 Term Loan B [Member] \| SOFR
Debt Instrument [Line Items]
Interest rate spread on variable rate	6.75%
2024 Term Loan B [Member] \| 2024 Revolving Credit Facility [Member] \| 2029 Secured Notes [Member]
Debt Instrument [Line Items]
Deferred financing costs					$ 10.3
Aggregate principal amount of senior notes issued					$ 400.0
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount		$ 1,250.0
Interest expense									68.4	73.6
Amortization of deferred financing costs									$ 2.5	$ 2.3
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] \| SOFR
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		$ 250.0
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.25%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.35%
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Fourth Amendment [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount		$ 330.0
2018 Credit Facility [Member] \| 2018 Revolving Credit Facility [Member] \| Adjusted term SOFR interest periods of one month
Debt Instrument [Line Items]
Interest rate spread on variable rate		0.11%
2018 Credit Facility [Member] \| 2018 Term Loan A [Member]
Debt Instrument [Line Items]
Outstanding principal amount		$ 250.0
2018 Credit Facility [Member] \| 2018 Term Loan A [Member] \| Fourth Amendment [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount		286.2
2018 Credit Facility [Member] \| 2018 Term Loan B [Member]
Debt Instrument [Line Items]
Outstanding principal amount		$ 750.0
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate								1.50%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| SOFR
Debt Instrument [Line Items]
Interest rate spread on variable rate								2.50%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| 2018 Revolving Credit Facility [Member] \| Adjusted term SOFR interest periods of three month
Debt Instrument [Line Items]
Interest rate spread on variable rate		0.26%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| 2018 Revolving Credit Facility [Member] \| Adjusted term Sofr interest periods of six month
Debt Instrument [Line Items]
Interest rate spread on variable rate		0.43%
2018 Credit Facility [Member] \| 2018 Term Loan B [Member] \| 2018 Revolving Credit Facility [Member] \| Adjusted term SOFR interest periods of twelve month
Debt Instrument [Line Items]
Interest rate spread on variable rate		0.72%