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Retirement Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 plan | Dec. 31, 2013 | Dec. 31, 2012
Defined contribution plans |  |  |
Number of defined contribution retirement plans | 6 ssd_NumberOfDefinedContributionRetirementPlans |  |
Cost of defined contribution plans | $ 8.0 us-gaap_DefinedContributionPlanCostRecognized | $ 8.2 us-gaap_DefinedContributionPlanCostRecognized | $ 7.7 us-gaap_DefinedContributionPlanCostRecognized
Contributions to pension funds | $ 2.3 us-gaap_PensionContributions | $ 2.2 us-gaap_PensionContributions | $ 2.1 us-gaap_PensionContributions
Defined contribution plan - U.S Plans |  |  |
Defined contribution plans |  |  |
Number of defined contribution retirement plans | 2 ssd_NumberOfDefinedContributionRetirementPlans / ssd_DefinedContributionPlanAxis = ssd_UnitedStatesDefinedContributionPlanMember |  |
Defined contribution plan - European and Canadian Plans |  |  |
Defined contribution plans |  |  |
Number of defined contribution retirement plans | 4 ssd_NumberOfDefinedContributionRetirementPlans / ssd_DefinedContributionPlanAxis = ssd_ForeignDefinedContributionPlanMember |  |
Defined contribution plan - European and Canadian Plans | Minimum |  |  |
Defined contribution plans |  |  |
Entity's contribution to retirement plans as percentage of employees' compensation | 3.00%ssd_DefinedContributionPlanEmployerContributionAsPercentageOfEmployeesCompensation / ssd_DefinedContributionPlanAxis = ssd_ForeignDefinedContributionPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Defined contribution plan - European and Canadian Plans | Maximum |  |  |
Defined contribution plans |  |  |
Entity's contribution to retirement plans as percentage of employees' compensation | 15.00%ssd_DefinedContributionPlanEmployerContributionAsPercentageOfEmployeesCompensation / ssd_DefinedContributionPlanAxis = ssd_ForeignDefinedContributionPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Represents the employer contribution as a percentage of participating employee's compensation. + References No definition available. + Details
Name: | ssd_DefinedContributionPlanEmployerContributionAsPercentageOfEmployeesCompensation
Namespace Prefix: | ssd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ssd_DefinedContributionPlanLineItems
Namespace Prefix: | ssd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of defined contribution retirement plans. + References No definition available. + Details
Name: | ssd_NumberOfDefinedContributionRetirementPlans
Namespace Prefix: | ssd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ssd_DefinedContributionPlanAxis=ssd_ForeignDefinedContributionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ssd_DefinedContributionPlanAxis=ssd_UnitedStatesDefinedContributionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |