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Sale of Receivables (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Sale of Receivables [Abstract]
Sale of receivables to financial institutions	$ 218.4	$ 203.1	$ 374.1	$ 394.4
Receivables not yet sold	10.8		10.8		$ 1.3
Charge related to sale of receivables	$ 7.7	$ 3.0	$ 11.2	$ 5.7

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

Amount of receivables presented at financial institutions but not yet sold as of balance sheet date.

+ References

No definition available.

+ Details

Name:	smp_SaleOfReceivablesNotYetSold
Namespace Prefix:	smp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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