A. O. Smith Corporation Master Trust - Investments in Master Trust (Details) - EBP 018 - USD ($)	Dec. 31, 2025	Dec. 31, 2024
EBP, Master Trust [Line Items]
Total investments	$ 627,232,739	$ 597,567,931
Master Trust
EBP, Master Trust [Line Items]
Total investments	627,232,739	594,940,751
Plan Interest
EBP, Master Trust [Line Items]
Total investments	627,232,739	594,940,751
Mutual Funds \| Master Trust
EBP, Master Trust [Line Items]
Total investments	228,903,211	208,931,038
Mutual Funds \| Plan Interest
EBP, Master Trust [Line Items]
Total investments	228,903,211	208,931,038
Common/Collective trusts \| Master Trust
EBP, Master Trust [Line Items]
Total investments	398,329,528	386,009,713
Common/Collective trusts \| Plan Interest
EBP, Master Trust [Line Items]
Total investments	$ 398,329,528	$ 386,009,713

Fair value of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Includes, but is not limited to, derivative, investment measured at net asset value per share as practical expedient, and insurance contract not meeting fully-benefit responsive investment criteria.

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+ Details

- 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

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