Amount of consideration recognized under contract modification.

No definition available.

Name:	amch_ContractModificationConsideration
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Weighted average discount rate used to the contract modification.

+ References

No definition available.

+ Details

Name:	amch_ContractModificationWeightedAverageDiscountRate
Namespace Prefix:	amch_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of increase (decrease) in foreign currency translation adjustment to contract with customer liabilities during the period.

+ References

No definition available.

+ Details

Name:	amch_ContractWithCustomerLiabilityForeignCurrencyTranslationAdjustment
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue reclassed that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

No definition available.

+ Details

Name:	amch_ContractWithCustomerLiabilityRevenueReclassed
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the cash received in advance on various revenue streams.

+ References

No definition available.

+ Details

Name:	amch_ContractsWithCustomersCashReceivedInAdvance
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents deferred revenue associated with customer contracts.

+ References

No definition available.

+ Details

Name:	amch_ContractsWithCustomersDeferredRevenue
Namespace Prefix:	amch_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the extension term of exhibitor services agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	amch_ExhibitorServicesAgreementExtensionTerm
Namespace Prefix:	amch_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_ChangeInContractWithCustomerLiabilityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

Name:	us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	amch_EquityMethodInvestmentActivityByClassificationAxis=amch_ExhibitorServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	amch_EquityMethodInvestmentActivityByClassificationAxis=amch_AmendedExhibitorServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_AdmissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_FoodAndBeverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=amch_TotalOtherProductAndServiceMember
Namespace Prefix:
Data Type:	na
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Period Type:

REVENUE RECOGNITION - Changes in liabilities (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 17, 2025	Dec. 31, 2025	Dec. 31, 2024	Apr. 16, 2025
Deferred revenues related to contracts with customers
Beginning balance		$ 425.6	$ 415.3
Cash received in advance		393.8	354.1
Foreign currency translation adjustment		4.7	(0.2)
Ending balance		462.4	425.6
Exhibitor Services Agreement
Deferred revenues related to contracts with customers
Beginning balance		464.0	486.6
Contract modification consideration		5.3
Reclassification to revenue as the result of performance obligations satisfied:		(10.2)	(22.6)
Ending balance		459.1	464.0
Contract modification, weighted average discount rate				7.50%
Amended ESA
Deferred revenues related to contracts with customers
Exhibitor services agreement, extension term	5 years
Contract modification, weighted average discount rate	16.12%
Admissions
Deferred revenues related to contracts with customers
Customer loyalty rewards accumulated, net of expirations:		19.7	22.6
Reclassification to revenue as the result of performance obligations satisfied:		(256.9)	(254.1)
Food and beverage
Deferred revenues related to contracts with customers
Customer loyalty rewards accumulated, net of expirations:		55.1	39.5
Reclassification to revenue as the result of performance obligations satisfied:		(91.0)	(75.8)
Other theatre
Deferred revenues related to contracts with customers
Customer loyalty rewards accumulated, net of expirations:			(2.6)
Reclassification to revenue as the result of performance obligations satisfied:		$ (88.6)	$ (73.2)