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Share Based Compensation - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense			$ 11.3	$ 12.7
Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Number of units granted (in shares) | shares			245,168	195,363
Value of units share units granted			$ 16.1	$ 16.1
Share based compensation expense	$ 2.1	$ 1.7	$ 9.4	$ 10.9
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Number of units granted (in shares) | shares			38,150	29,475
Value of units share units granted			$ 2.5	$ 2.4
Share based compensation expense	$ 0.7	$ 0.4	$ 1.9	$ 1.3
Performance Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential payouts range	0		0
Performance Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential payouts range	1.50		1.50
A.O. Smith Combined Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for granting of options or share units (in shares) | shares	2,043,675		2,043,675

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