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Contingencies - Schedule of Notes Receivable Balances from Insurance Companies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance beginning of period	$ 59.6	$ 76.9
Additions	0.4	1.7
Collections	0.0	$ (19.0)
Balance end of period	$ 60.0

X

- Definition

Notes, Loans and Financing Receivable, Insurance Companies, Additions

+ References

No definition available.

+ Details

Name:	msa_NotesLoansandFinancingReceivableInsuranceCompaniesAdditions
Namespace Prefix:	msa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Notes, Loans and Financing Receivable, Insurance Companies, Proceeds

+ References

No definition available.

+ Details

Name:	msa_NotesLoansandFinancingReceivableInsuranceCompaniesProceeds
Namespace Prefix:	msa_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Notes, Loans and Financing Receivable, Net, Insurance Companies

+ References

No definition available.

+ Details

Name:	msa_NotesLoansandFinancingReceivableNetInsuranceCompanies
Namespace Prefix:	msa_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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