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Income Taxes (Schedule of Non-income Tax Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Payroll taxes	$ 28.2	$ 23.9	$ 20.8
Property, franchise and capital stock taxes	$ 5.2	$ 4.8	$ 5.4

X

- Definition

Payroll taxes.

+ References

No definition available.

+ Details

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Namespace Prefix:	awi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Property, franchise and capital stock taxes.

+ References

No definition available.

+ Details

Name:	awi_PropertyFranchiseAndCapitalStockTaxes
Namespace Prefix:	awi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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