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Sale of Receivables (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Receivables [Abstract]
Sale of receivables to financial institutions	$ 285.4	$ 260.4	$ 686.3	$ 643.0
Receivables not yet collected	1.8		1.8
Charge related to sale of receivables	$ 14.9	$ 14.6	$ 38.3	$ 36.1

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- Definition

Sale Of Receivables

+ References

No definition available.

+ Details

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

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- Definition

Sale Of Receivables Related Charges

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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

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- 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

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Balance Type:	debit
Period Type:	instant