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Sale of Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Sale of Receivables [Abstract]
Sale of receivables to financial institutions	$ 230.1	$ 211.6	$ 400.9	$ 382.5
Receivables not yet collected	14.4		14.4		$ 4.5
Charge related to sale of receivables	$ 13.4	$ 12.4	$ 23.4	$ 21.5

X

- Definition

The amount of receivables sold during the period.

+ References

No definition available.

+ Details

Name:	smp_SaleOfReceivables
Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of charges incurred relating to the sale of receivables during the reporting period.

+ References

No definition available.

+ Details

Name:	smp_SaleOfReceivablesRelatedCharges
Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount, before valuation allowance, of accounts receivable held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

Name:	us-gaap_TradeReceivablesHeldForSaleAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant