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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2025
Jan. 31, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-475    
Entity Registrant Name A. O. Smith Corporation    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 39-0619790    
Entity Address, Address Line One 11270 West Park Place    
Entity Address, City or Town Milwaukee    
Entity Address, State or Province WI    
Entity Address, Postal Zip Code 53224    
City Area Code 414    
Local Phone Number 359-4000    
Title of 12(b) Security Common Stock (par value $1.00 per share)    
Trading Symbol AOS    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Documents Incorporated by Reference
1.Portions of the company’s definitive Proxy Statement for the 2026 Annual Meeting of Stockholders (to be filed with the Securities and Exchange Commission under Regulation 14A within 120 days after the end of the registrant’s fiscal year and, upon such filing, to be incorporated by reference in Part III).
    
Amendment Flag false    
Entity Central Index Key 0000091142    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   25,863,159  
Entity Public Float     $ 51,976,522
Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   112,426,758  
Entity Public Float     $ 7,422,052,617