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Sale of Receivables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Sale of Receivables [Abstract] |  |  |  |  |
Sale of receivables to financial institutions | $ 260.4 | $ 236.3 | $ 643.0 | $ 610.4 |
Receivables not yet collected | 12.6 |  | 12.6 |  | $ 0.0
Charge related to sale of receivables | $ 14.6 | $ 10.6 | $ 36.1 | $ 21.8 |

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- 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

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- 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

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