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Goodwill Carrying Amount of Goodwill By Segment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Goodwill [Roll Forward]
Goodwill beginning of period, net	$ 125.5us-gaap_Goodwill
Foreign currency translation adjustments	(1.0)us-gaap_GoodwillTranslationAdjustments
Goodwill end of period, net	124.5us-gaap_Goodwill
Reconstituted Tobacco [Member]
Goodwill [Roll Forward]
Goodwill beginning of period, net	5.3us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Foreign currency translation adjustments	(0.6)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Goodwill end of period, net	4.7us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Filtration [Member]
Goodwill [Roll Forward]
Goodwill beginning of period, net	120.2us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Foreign currency translation adjustments	(0.4)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Goodwill end of period, net	$ 119.8us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

+ Details

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

X

- Details

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

X

- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=swm_FiltrationSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=swm_ReconstitutedTobaccoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: