XML 69 R54.htm IDEA: XBRL DOCUMENT
v3.8.0.1

General (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 country joint_venture segment production_locations
Nature of Business [Line Items] |
Number of operating segments | segment | 2
Number of countries in which entity operates | country | 90
Number of production locations | production_locations | 23
China [Member] |
Nature of Business [Line Items] |
Number of joint ventures | joint_venture | 2
Ownership of joint ventures (as a percent) | 50.00%

X
- Definition Nature of Business [Line Items] + References No definition available. + Details
Name: | swm_NatureOfBusinessLineItems
Namespace Prefix: | swm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Joint Ventures + References No definition available. + Details
Name: | swm_NumberOfJointVentures
Namespace Prefix: | swm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of production location worldwide. The Company has mills in the United States, France, the Philippines, Indonesia, Brazil and Poland. + References No definition available. + Details
Name: | swm_NumberOfProductionLocations
Namespace Prefix: | swm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of countries in which the entity operates as of balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_EntityByLocationAxis=swm_ChinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |