v3.26.1
A. O. Smith Corporation Master Trust - Investments at Fair Value by Classification (Details) - EBP 018 - USD ($)
Dec. 31, 2025
Dec. 31, 2024
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value $ 627,232,739 $ 594,940,751
Total    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value 228,903,211 208,931,038
Level 1    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value 228,903,211 208,931,038
Level 2    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value 0 0
Level 3    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value 0 0
NAV    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value 398,329,528 386,009,713
Mutual Funds | Total    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value 228,903,211 208,931,038
Mutual Funds | Level 1    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value 228,903,211 208,931,038
Mutual Funds | Level 2    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value 0 0
Mutual Funds | Level 3    
EBP, Master Trust [Line Items]    
Plan interest in A.O. Smith Corporation Master Trust at Fair Value $ 0 $ 0