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Contingent Liabilities and Other Matters - Executive Agreements (Details) - Executive officers - executive_officer	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2020
Executive Agreements
Period of rolling term of employment agreements	1 year
Number of executive officers with severance benefit agreements		7

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- References

No definition available.

+ Details

Name:	spxc_ExecutiveAgreementsAbstract
Namespace Prefix:	spxc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the period of rolling term of employment agreements.

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No definition available.

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Namespace Prefix:	spxc_
Data Type:	xbrli:durationItemType
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- Definition

Supplemental Unemployment Benefits, Number of Individuals with Severance Benefit Agreements

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No definition available.

+ Details

Name:	spxc_SupplementalUnemploymentBenefitsNumberofIndividualswithSeveranceBenefitAgreements
Namespace Prefix:	spxc_
Data Type:	xbrli:integerItemType
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Period Type:	instant

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- Details

Name:	srt_TitleOfIndividualAxis=srt_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: