XML 53 R42.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Sale of Receivables (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Sale of Receivables [Abstract] |  |  |  |
Sale of receivables to financial institutions | $ 224.4 | $ 210.6 | $ 566.0 | $ 614.6
Charge related to sale of receivables | $ 7.3 | $ 6.0 | $ 19.0 | $ 17.6

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 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