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Employee Benefit Plans - Obligations and Funded Status Narrative (Details) $ in Millions	Dec. 31, 2022 USD ($)
Pension plans
Employee benefit plans
Non-funded plan, current underfunded status	$ 47.3

X

- Definition

The unfunded status is measured as the difference between the benefit obligation and the fair value of plan assets. Unfunded plans may include foreign pension plans and may also include other postretirement benefit plans.

+ References

No definition available.

+ Details

Name:	spxc_DefinedBenefitPlanUnfundedStatusOfPlan
Namespace Prefix:	spxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: