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Share-Based Compensation Plans (Schedule of the Allocation of Performance Shares Between Total Shareholder Return and Earnings per Share) (Details) - Performance Based Awards [Member] | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total shareholder return | 62.00% | 55.00% | 36.00%
Earnings per share | 38.00% | 45.00% | 64.00%

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- Definition Percent of award allocated to earnings per share + References No definition available. + Details
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Namespace Prefix: | sri_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percent of award allocated to total shareholder return + References No definition available. + Details
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Namespace Prefix: | sri_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |