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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