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Special Charges, Net - Analysis of Restructuring Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restructuring liabilities
Balance at beginning of year	$ 0.3	$ 0.9	$ 0.4
Special charges	0.1	1.0	2.0
Utilization — cash	(0.4)	(1.6)	(1.5)
Balance at the end of year	0.0	0.3	0.9
Asset impairment charges	$ 0.3	$ 0.0	$ 0.4

X

- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring or integration cost.

+ References

No definition available.

+ Details

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

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

Amount of non-cash special charges that impact special charges but not restructuring and integration related liabilities.

+ References

No definition available.

+ Details

Name:	spxc_SpecialChargesNonCash
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