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Contingent Liabilities and Other Matters - Environmental Matters (Details) - Site investigation and remediation - site	Dec. 31, 2020	Dec. 31, 2019
Environmental Matters
Number of sites	25	29
Number of third-party disposal sites for which entity is potentially responsible	11	14
Number of active sites	9

X

- Definition

Represents the number of offsite, third-party disposal sites which have been active in the past few years.

+ References

No definition available.

+ Details

Name:	spxc_SiteContingencyNumberOfActiveSites
Namespace Prefix:	spxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of sites which have liabilities for site investigation and remediation.

+ References

No definition available.

+ Details

Name:	spxc_SiteContingencyNumberOfSites
Namespace Prefix:	spxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of offsite, third-party disposal sites for which the entity is potentially responsible and have received notices of potential liability pursuant to various environmental laws.

+ References

No definition available.

+ Details

Name:	spxc_SiteContingencyNumberOfSitesOnWhichEntityPotentiallyResponsible
Namespace Prefix:	spxc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_EnvironmentalRemediationContingencyAxis=us-gaap_EnvironmentalIssueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: