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SPECIAL CHARGES, NET - Analysis of Restructuring Liabilities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 28, 2025	Jun. 29, 2024
Restructuring liabilities
Balance at beginning of year	$ 1.8	$ 0.7
Special charges	0.1	0.4
Utilization — cash	(0.9)	(0.8)
Balance at end of period	$ 1.0	$ 0.3

X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. Also includes integration reserves.

+ References

No definition available.

+ Details

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

X

- Definition

Reserve increase representing the amount charged against earnings in the period for a specified incurred and estimated type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. Also includes the amount charged against earnings in the period for integration expenses.

+ References

No definition available.

+ Details

Name:	spxc_RestructuringAndIntegrationReservesPeriodExpense
Namespace Prefix:	spxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Restructuring and Integration Reserves, Settled with Cash

+ References

No definition available.

+ Details

Name:	spxc_RestructuringAndIntegrationReservesSettledWithCash
Namespace Prefix:	spxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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