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Leases - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021 lease_renewal
Leases [Abstract] |
Number of finance renewals (or more) | 1
Number of operating renewals (or more) | 1

X
- Definition Lessee, Finance Lease, Number of Renewals + References No definition available. + Details
Name: | swm_LesseeFinanceLeaseNumberOfRenewals
Namespace Prefix: | swm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lessee, Operating Lease, Number of Renewals + References No definition available. + Details
Name: | swm_LesseeOperatingLeaseNumberOfRenewals
Namespace Prefix: | swm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration