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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2021
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share	$ 0.23	$ 0.48
Common stock issued per share for stock bonus (in USD per share)	$ 80.38	$ 93.45

X

- Definition

The amount of each share issued during the period as a result of share-based compensation plans other than an employee stock ownership plan (ESOP).

+ References

No definition available.

+ Details

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Namespace Prefix:	ssd_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration