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Debt - Schedule of Debt Summarized (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total	$ 440.1us-gaap_LongTermDebt	$ 385.4us-gaap_LongTermDebt
Less: Current debt	(2.9)us-gaap_LongTermDebtCurrent	(4.2)us-gaap_LongTermDebtCurrent
Long-Term Debt	437.2us-gaap_LongTermDebtNoncurrent	381.2us-gaap_LongTermDebtNoncurrent
French Employee Profit Sharing [Member]
Debt Instrument [Line Items]
Total	14.6us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember	15.8us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_LoansPayableMember
Bank Overdrafts [Member]
Debt Instrument [Line Items]
Total	0.4us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_BankOverdraftsMember	1.7us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_BankOverdraftsMember
Other [Member]
Debt Instrument [Line Items]
Total	0us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember	0.2us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember
Revolving Credit Agreement - U.S. dollar borrowings [Member] | Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Total	354.0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = swm_UsRevolverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember	367.7us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = swm_UsRevolverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember
Revolving Credit Agreement - euro borrowings [Member] | Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Total	$ 71.1us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = swm_EuroRevolverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember	$ 0us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = swm_EuroRevolverMember / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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)

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



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

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

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



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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-Section S99

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

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



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- Definition

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+ References

Reference 1: 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)

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



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-Number 210

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