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Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 plan	Dec. 31, 2013	Dec. 31, 2012
Defined contribution plans
Number of defined contribution retirement plans	6ssd_NumberOfDefinedContributionRetirementPlans
Cost of defined contribution plans	$ 8.0us-gaap_DefinedContributionPlanCostRecognized	$ 8.2us-gaap_DefinedContributionPlanCostRecognized	$ 7.7us-gaap_DefinedContributionPlanCostRecognized
Contributions to pension funds	$ 2.3us-gaap_PensionContributions	$ 2.2us-gaap_PensionContributions	$ 2.1us-gaap_PensionContributions
Defined contribution plan - U.S Plans
Defined contribution plans
Number of defined contribution retirement plans	2ssd_NumberOfDefinedContributionRetirementPlans / ssd_DefinedContributionPlanAxis = ssd_UnitedStatesDefinedContributionPlanMember
Defined contribution plan - European and Canadian Plans
Defined contribution plans
Number of defined contribution retirement plans	4ssd_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

X

- 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

X

- Details

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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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