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Sale of Receivables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Sale of Receivables [Abstract] |  |  |  |  |
Sale of receivables to financial institutions | $ 232.5 | $ 213.3 | $ 626.9 | $ 511.1 |
Receivables not yet collected | 5.2 |  | 5.2 |  | $ 50.0
Charge related to sale of receivables | $ 3.0 | $ 3.5 | $ 8.7 | $ 9.4 |

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- Definition The amount of receivables sold during the period. + 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 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 -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
Name: | us-gaap_TradeReceivablesHeldForSaleAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant