Debt Instrument, Capitalized Fee Amount

No definition available.

Name:	awi_DebtInstrumentCapitalizedFeeAmount
Namespace Prefix:	awi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Leverage ratio threshold conditions for borrowing under the credit facility.

+ References

No definition available.

+ Details

Name:	awi_LineOfCreditFacilityCovenantLeverageRatioThreshold
Namespace Prefix:	awi_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Percent of Consolidated Excess Cash Flow required for Prepayment

+ References

No definition available.

+ Details

Name:	awi_PercentOfConsolidatedExcessCashFlowRequiredForPrepayment
Namespace Prefix:	awi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percent of Consolidated Excess Cash Flow required for Prepayment, Below Leverage Ratio

+ References

No definition available.

+ Details

Name:	awi_PercentOfConsolidatedExcessCashFlowRequiredForPrepaymentBelowLeverageRatio
Namespace Prefix:	awi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrestricted Cash and Cash Equivalents

+ References

No definition available.

+ Details

Name:	awi_UnrestrictedCashAndCashEquivalents
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

+ References

+ Details

Name:	us-gaap_DebtInstrumentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(2))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 10

-Section F

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

+ Details

Name:	us-gaap_SubordinatedDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.8)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Debt (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended		0 Months Ended			0 Months Ended
	Mar. 15, 2013	Jun. 30, 2013	Mar. 15, 2013 Term Loan A [Member]	Mar. 15, 2013 Term Loan B [Member]	Mar. 15, 2013 Amended Senior Credit Facility [Member]	Mar. 15, 2013 Amended Senior Credit Facility [Member] Term Loan A [Member]	Mar. 15, 2013 Amended Senior Credit Facility [Member] Term Loan B [Member]	Mar. 15, 2013 Amended Senior Credit Facility [Member] Revolving Credit Facility [Member]	Mar. 15, 2013 Amended Senior Credit Facility [Member] Letters of Credit [Member]	Mar. 28, 2013 Securitization Facility [Member]	Mar. 28, 2013 Amended Securitization Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity					$ 1,300.0	$ 550.0	$ 475.0	$ 250.0	$ 150.0	$ 100.0	$ 75.0
Basis spread on LIBOR	3.00%				2.50%
Maturity date			Nov. 01, 2015	Mar. 01, 2018		Mar. 01, 2018	Mar. 01, 2020
Maximum unrestricted cash and cash equivalents for leverage ratio calculation		100.0
Credit facility, covenant leverage ratio threshold	3.5
Required prepayment amount, percent of consolidated excess cash flow	50.00%
Required prepayment amount below leverage ratio, percent of consolidated excess cash flow	0.00%
Bank, legal and other fees	8.3
Fees capitalized and amortized into interest expense	7.2
Unamortized debt financing costs written off	18.9
Subordinated notes payable		$ 139.4