10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the fiscal year ended December 31, 2011

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the transition period from                  to                 .

Commission File Number 1-475

A. O. Smith Corporation

(Exact name of registrant as specified in its charter)

Delaware	39-0619790
(State of Incorporation)	(I.R.S. Employer Identification No.)

11270 West Park Place, Milwaukee, Wisconsin	53224-9508
(Address of Principal Executive Office)	(Zip Code)

(414) 359-4000

Registrant’s telephone number, including area code

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Shares of Stock Outstanding January 31, 2012	Name of Each Exchange on Which Registered
Class A Common Stock (par value $5.00 per share)	6,679,997	Not listed
Common Stock (par value $1.00 per share)	39,266,453	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None.

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

þYes    ¨No         

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.

¨Yes    þNo        

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

    þYes    ¨No.

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

þYes    ¨No         

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.                    þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	þ	Accelerated filer    ¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company    ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act.)

¨Yes    þNo         

The aggregate market value of voting stock held by non-affiliates of the registrant was $37,497,159 for Class A Common Stock and $1,586,129,826 for Common Stock as of June 30, 2011.

DOCUMENTS INCORPORATED BY REFERENCE

1. Portions of the company’s definitive Proxy Statement for the 2012 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).

Table of Contents

A. O. Smith Corporation

Index to Form 10-K

Year Ended December 31, 2011

		Page
Part I
Item 1.	Business		3
Item 1A.	Risk Factors		5
Item 1B.	Unresolved Staff Comments		10
Item 2.	Properties		10
Item 3.	Legal Proceedings		10
Item 4.	Mine Safety Disclosures		10
Part II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities		13
Item 6.	Selected Financial Data		15
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		16
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk		25
Item 8.	Financial Statements and Supplementary Data		26
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure		60
Item 9A.	Controls and Procedures		60
Item 9B.	Other Information		61
Part III
Item 10.	Directors, Executive Officers and Corporate Governance		63
Item 11.	Executive Compensation		63
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters		63
Item 13.	Certain Relationships and Related Transactions and Director Independence		64
Item 14.	Principal Accounting Fees and Services		64
Part IV
Item 15.	Exhibits, Financial Statement Schedules		65

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PART 1

ITEM 1 - BUSINESS

We are a leading manufacturer of water heaters and boilers, serving a diverse mix of residential and commercial end markets principally in the United States with a strong and growing international presence. During the fourth quarter of 2011 we reorganized our management reporting structure to reflect our current business activities and reconsidered our reporting segments. Historical information has been revised to reflect our new structure. Our company is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless, oil and electric water heaters and commercial water heating equipment. Both segments primarily serve their respective regions of the world. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing and non-condensing boilers and water systems tanks. The Rest of World segment also manufactures and markets water treatment products, primarily for Asia.

On August 22, 2011, we sold our Electrical Products business (EPC) to Regal Beloit Corporation (RBC) for approximately $760 million in cash and approximately 2.83 million shares of RBC common stock valued at $140.6 million as of that date. Due to the sale, EPC has been reflected as a discontinued operation in the accompanying financial statements for all periods presented. For further information about EPC, see Note 2 to the Consolidated Financial Statements.

The following table summarizes our sales from continuing operations. This summary and all other information presented in this section should be read in conjunction with the Consolidated Financial Statements and Notes to Consolidated Financial Statements, which appear in Item 8 in this document.

	Years Ended December 31 (dollars in millions)
	2011			2010			2009			2008			2007
North America	$	1,289.5		$	1,155.4		$	1,135.9		$	1,245.1		$	1,263.5
Rest of World		455.6			368.9			256.5			223.0			175.2
Inter-segment Sales		(34.6	)		(35.0	)		(17.4	)		(16.8	)		(15.6	)
Total Sales	$	1,710.5		$	1,489.3		$	1,375.0		$	1,451.3		$	1,423.1

NORTH AMERICA

In our North America segment, sales increased 11.6 percent or $134.1 million in 2011 compared with the prior year. On August 26, 2011, we acquired Lochinvar Corporation, of Lebanon, Tennessee (Lochinvar) which added $75.9 million to sales. The impact of the Lochinvar acquisition and pricing actions related to higher raw material costs represent the majority of the increase in sales from the prior year.

We serve residential and commercial end markets in North America with a broad range of products including:

Gas, gas tankless, oil and electric water heaters. Our residential and commercial water heaters come in sizes ranging from 2.5 gallon (point-of-use) models to 594 gallon appliances with varying efficiency ranges. We offer electric, natural gas, oil and liquid propane models as well as solar tanks and gas tankless units for today’s energy efficient homes. North American residential water heater sales in 2011 were approximately $875 million or 67.9 percent of North America revenues. Typical applications include residences, restaurants, hotels and motels, laundries, car washes and small businesses.

Boilers. Our residential and commercial boilers range in size from 45,000 British Thermal Units (BTUs) to 3.5 million BTUs. Our commercial boilers are used primarily in space heating applications including buildings, hospitals, schools, hotels and other large commercial buildings.

Other. Our North America segment also manufactures copper-tube boilers and expansion tanks, commercial solar systems, swimming pool and spa heaters, and related products and parts.

A significant portion of the segment’s business is derived from the replacement of existing products, and we believe that the sale of products to the North America residential new housing construction market since 2008 represents less than ten percent of the segment’s total residential water heater sales.

We are the largest manufacturer and marketer of water heaters in North America, and we have a leading share in both the residential and commercial markets. As the leader in the residential water heating market, we offer an extensive line of high-efficiency gas and electric water heaters and boilers. In the commercial market, we believe our comprehensive product line, including boilers, as well as our high-efficiency products, give us a competitive advantage in this higher margin portion of the water heating industry.

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Our wholesale distribution channel includes more than 1,100 independent wholesale plumbing distributors with more than 4,400 selling locations serving residential and commercial end markets. We also sell our residential water heaters through the retail channel. In this channel, our customers include five of the seven largest national hardware and home center chains, including long-standing exclusive branding relationships with both Lowe’s Companies, Inc. and Sears, Roebuck and Co. Our boiler distribution channel is comprised of manufacturer representative firms.

We acquired Lochinvar for approximately $421 million plus an earnout of up to $35 million if certain objectives are achieved by November 2012. Lochinvar is one of the leading manufacturers of residential and commercial boilers in the United States. Lochinvar’s sales for the twelve months ended November 30, 2011 (Lochinvar’s former fiscal year end), were approximately $200 million and have grown at an eight percent compound annual growth rate over the last five years. Lochinvar is a leader in the manufacture of high-efficiency, hydronic boilers used in commercial and residential applications, and in the manufacture of commercial and industrial water heaters.

On July 1, 2010, we acquired the rights from Takagi Industrial Co., Ltd. of Fuji-City, Shizuoka, Japan (Takagi), to market tankless water heaters in North America and entered into a long-term agreement with Takagi to supply tankless water heaters. As part of the venture, we took over the management of Takagi’s North American sales and distribution organization. Through this venture, we offer a full line of gas tankless water heaters under our own brands in association with the Takagi brand.

Our energy efficient product offerings continue to be a growing driver of our business. Our Cyclone product family continues to be the preferred choice for commercial customers looking for high efficiency water heating with a short payback period through energy savings. We now offer the iCOMM remote monitoring service that allows customers to view their Cyclone water heaters’ operation via the internet allowing them to track the energy usage and savings. In 2010, we introduced residential solar and heat pump water heaters in the U.S. as well as other higher efficiency water heating solutions to round out our energy efficient product offerings.

We sell our water heating products in highly competitive markets. We compete in each of our targeted market segments based on product design, quality of products and services, performance and price. Our principal water heating and boiler competitors in the U.S. include Rheem, Bradford-White, Aerco, Weil-McLain, and HTP. Additionally, we compete with numerous other private water heater and boiler manufacturing companies.

REST OF WORLD

Sales in our Rest of World segment increased 23.5 percent, or $86.7 million compared with the prior year. A 29.0 percent increase in sales of A. O. Smith branded products in China to $371.7 million was the primary source of the increase in sales.

We entered the Chinese water heater market through a joint venture in 1995, buying out our partner three years later. Since that time, we have been aggressively expanding our presence while building A. O. Smith brand recognition in the Chinese residential and commercial markets. We believe we are one of the leading suppliers of water heaters to the residential market in China, with a broad product offering including electric, gas tankless, heat pump and solar units.

In 2008, we established a sales office in India and began importing products specifically designed for India from our Nanjing, China facility. We began manufacturing water heaters in India in the second quarter of 2010. Our sales in India more than doubled to $18.1 million in 2011 compared with the prior year.

In November 2009, we purchased 80 percent of the water treatment business of Tianlong Holding Co., Ltd. of Hong Kong, (Tianlong) and we are operating the business as A. O. Smith (Shanghai) Water Treatment Products Co. Ltd. (SWT). We manufacture, and through our current water heater distribution channels, supply water treatment products such as reverse osmosis units to the China residential and commercial markets, as well as export markets throughout the world. In the fourth quarter of 2010, we purchased the remaining 20 percent interest in Tianlong and now own 100 percent of the company.

Our primary competitor in China is Haier Appliances, a Chinese company, but we also compete with Ariston, Siemens and Midea in the electric water heater market and Rinnai and Noritz in the gas tankless water heater market. Additionally, we compete with numerous other Chinese private and state-owned water heater and water treatment companies in China. In India, we compete with Bajaj and MTS-Racold and numerous other companies.

In addition we sell water heaters to the European and Middle Eastern markets which are less than three percent of total sales.

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RAW MATERIAL

Raw materials for our manufacturing operations, primarily consisting of steel, are generally available from several sources in adequate quantities. A portion of our customers are contractually obligated to accept price changes based on fluctuations in steel prices. Significant volatility in steel costs has occurred over the last several years.

RESEARCH AND DEVELOPMENT

To improve competitiveness by generating new products and processes, we conduct research and development at our Corporate Technology Center in Milwaukee, Wisconsin, our Global Engineering Center in Nanjing, China, and at our operating locations. Total expenditures for research and development in 2011, 2010 and 2009 were $42.7 million, $37.1 million and $31.0 million, respectively.

PATENTS AND TRADEMARKS

We own and use in our businesses various trademarks, trade names, patents, trade secrets and licenses. We do not believe that our business as a whole is materially dependent upon any such trademark, trade name, patent, trade secret or license. However, our trade name is important with respect to our products, particularly in China, India and the U.S.

EMPLOYEES

Our operations employed approximately 10,600 employees as of December 31, 2011, primarily non-union.

BACKLOG

Due to the short-cycle nature of our businesses, none of our operations sustain significant backlogs.

ENVIRONMENTAL LAWS

Our operations are governed by a variety of federal, foreign, state and local laws intended to protect the environment. Compliance with the environmental laws has not had and is not expected to have a material effect upon the capital expenditures, earnings, or competitive position of our company. See Item 3.

AVAILABLE INFORMATION

We maintain a website with the address www.aosmith.com. The information contained on our website is not included as a part of, or incorporated by reference into, this Annual Report on Form 10-K. Other than an investor’s own internet access charges, we make available free of charge through our website our Annual Report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to these reports as soon as reasonably practical after we have electronically filed such material with, or furnished such material to, the Securities and Exchange Commission.

The company is committed to sound corporate governance and has documented its corporate governance practices by adopting the A. O. Smith Corporate Governance Guidelines. The Corporate Governance Guidelines, Criteria for Selection of Directors, Financial Code of Ethics, the A. O. Smith Guiding Principles, as well as the charters for the Audit, Personnel and Compensation, Nominating and Governance and the Investment Policy Committees and other corporate governance materials may be viewed on the company’s website. Any waiver of or amendments to the Financial Code of Conduct or the A. O. Smith Guiding Principles also would be posted on this website; to date there have been none. Copies of these documents will be sent to stockholders free of charge upon written request of the corporate secretary at the address shown on the cover page of this Annual Report on Form 10-K.

ITEM 1A – RISK FACTORS

You should carefully consider the risk factors set forth below and all other information contained in this Annual Report on Form 10-K, including the documents incorporated by reference, before making an investment decision regarding our common stock. If any of the events contemplated by the following risks actually occurs, then our business, financial condition, or results of operations could be materially adversely affected. As a result, the trading price of our common stock could decline, and you may lose all or part of your investment. The risks and uncertainties below are not the only risks facing our company.

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• The effects of the global economic downturn could have a material adverse effect on our business

The global credit and capital markets are still showing signs of stress, and threaten to stall or reverse the course of any recovery. If this were to occur it could adversely affect consumer confidence and spending patterns which could result in decreased demand for the products we sell, a delay in purchases, increased price competition, or slower adoption of energy efficient water heaters or boilers which could negatively impact our profitability and/or cash flow. In addition, a deterioration in current economic conditions, including the credit market conditions, could negatively impact our vendors and customers, which could result in an increase in bad debt expense, customer and vendor bankruptcies, interruption or delay in supply of materials, or increased material prices, which could negatively impact our ability to distribute, market and sell our products and our financial condition, results of operations and cash flows.

• A portion of our business could continue to be adversely affected by a decline in new commercial construction

Commercial construction activity could continue the decline that began in the second half of 2008 and declined further in 2009 and 2010 before leveling off in 2011. Though we believe that the majority of the commercial business we serve is for replacement, we could also be affected by changes in the commercial construction market.

• A portion of our business could be affected by a slowing Chinese economy

Approximately 78 percent of our growth over the past five years has occurred in China. In 2012, we are commencing construction on a facility which will expand our manufacturing capacity by 50 percent. If the Chinese economy were to experience a significant slowdown, it could adversely affect our financial condition, results of operations and cash flows.

• A material loss, cancellation, reduction, or delay in purchases by one or more of our largest customers could harm our business

Net sales to our five largest customers represented approximately 38 percent of our 2011 net sales from continuing operations. We expect that customer concentration will continue for the foreseeable future. Our dependence on sales from a relatively small number of customers makes our relationship with each of these customers important to our business. We cannot assure that we will be able to retain our largest customers. Some of our customers may in the future shift their purchases of products to our competitors. The loss of one or more of our largest customers, any material reduction or delay in sales to these customers, our inability to successfully develop relationships with additional customers, or our inability to execute on pricing actions could have a material adverse effect on our financial position, results of operations and cash flows.

• Our newly acquired Lochinvar business’ growth could stall or our stated synergies could fail to materialize resulting in lower than expected accretion from the acquisition

The compound annual growth rate of Lochinvar’s revenues has been eight percent over the past five years, largely due to the transition in the boiler industry from lower efficiency, non-condensing boilers to higher efficiency, condensing boilers and Lochinvar is a leading residential and commercial condensing boiler company. In 2003, approximately five percent of the boilers sold in the U.S. were condensing boilers and by 2010, the percentage had grown to approximately 25 percent. We expect the transition to continue, which would result in greater than ten percent growth in Lochinvar’s sales in 2012 and greater than eight percent growth in Lochinvar sales for the foreseeable future after 2012. If the transition to higher efficiency, condensing boilers stalls as a result of lower energy costs, another recession occurs or our competitors’ technologies surpassing Lochinvar’s, our growth rate could be lower than expected. In addition, we have stated that we expect to achieve synergies from the Lochinvar acquisition of $10 to $15 million in the next several years. If our growth rate slows or our synergies fail to materialize, our stated accretion from the Lochinvar acquisition in 2012 of $.40 to $.50 per share could be materially impacted.

• Because we participate in markets that are highly competitive, our revenues could decline as we respond to competition

We sell all of our products in highly competitive markets. We compete in each of our targeted markets based on product design, reliability, quality of products and services, advanced technologies, product performance, maintenance costs and price. We compete against manufacturers located, primarily, in North America and China. Some of our competitors may have greater financial, marketing, manufacturing, research and development and distribution resources than we have. We cannot assure that our products and services will continue to compete successfully with those of our competitors or that we will be able to retain our customer base or improve or maintain our profit margins on sales to our customers, all of which could materially and adversely affect our financial condition, results of operations and cash flows.

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• We increasingly manufacture and sell our products outside the U.S., which may present additional risks to our business

Approximately 35 percent of our 2011 net sales was attributable to products manufactured and sold outside of the U.S., principally in China. Approximately 5,800 of our 10,600 total employees as of December 31, 2011 were located in China. At December 31, 2011, nearly $300 million of our cash balances were located in China. In 2010, we opened a manufacturing plant in India. International operations generally are subject to various risks, including political, religious, and economic instability, local labor market conditions, the imposition of foreign tariffs and other trade restrictions, the impact of foreign government regulations, the effects of income and withholding taxes, governmental expropriation, imposition or increase in withholding and other taxes on remittances and other payments by foreign subsidiaries, labor relations problems, the imposition of environmental or employment laws, or other restrictions by foreign governments and differences in business practices. We may incur increased costs and experience delays or disruptions in product deliveries and payments in connection with international manufacturing and sales that could cause loss of revenue. Unfavorable changes in the political, regulatory, and business climate could have a material adverse effect on our financial condition, results of operations and cash flows or our ability to repatriate funds to the U.S.

• Our international operations are subject to risks related to foreign currencies

We have significant operations outside of the U.S., primarily in China and Canada and to a lesser extent India and Mexico, and therefore, hold assets, incur liabilities, earn revenues and pay expenses in a variety of currencies other than the U. S. dollar. The financial statements of our foreign subsidiaries are translated into U.S. dollars. As a result, we are subject to risks associated with operating in foreign countries, including fluctuations in currency exchange rates and interest rates, or hyperinflation in some foreign countries. Furthermore, we typically price our products in our foreign operations in local currencies. As a result, an increase in the value of the U.S. dollar relative to the local currencies of our profitable foreign subsidiaries could have a negative effect on our profitability. In addition to currency translation risks, we incur a currency transaction risk whenever one of our operating subsidiaries enters into either a purchase or sale transaction using a currency different from the operating subsidiaries’ functional currency. The above mentioned risks in North America and Asia may hurt our ability to generate revenue and profits in those regions in the future.

• We are subject to regulation of our international operations that could adversely affect our business and results of operations

Due to our global operations, we are subject to many laws governing international relations, including those that prohibit improper payments to government officials and restrict where we can do business, what information or products we can supply to certain countries and what information we can provide to a non-U.S. government, including but not limited to the Foreign Corrupt Practices Act and the U.S. Export Administration Act. Violations of these laws, which are complex, may result in criminal penalties or sanctions that could have a material adverse effect on our financial condition, results of operations and cash flows.

• Our operations could be adversely impacted by material price volatility and supplier concentration

The market prices for certain raw materials we purchase, primarily steel, have been very volatile in the recent past. Significant increases in the cost of any of the key materials we purchase could increase our cost of doing business and ultimately could lead to lower operating earnings if we are not able to recover these cost increases through price increases to our customers. Historically, there has been a lag in our ability to recover increased material costs from customers, and that lag could negatively impact our profitability. In addition, in some cases we are dependent on a limited number of suppliers for some of the raw materials and components required in the manufacture of our product. A significant disruption or termination of the supply from one of these suppliers could delay sales or increase costs which could result in a material adverse effect on our financial condition, results of operations and cash flows.

• Our business may be adversely impacted by product defects

Product defects can occur through our own product development, design and manufacturing processes or through our reliance on third parties for component design and manufacturing activities. We may incur various expenses related to product defects, including product warranty costs, product recall and retrofit costs and product liability costs. While we maintain a reserve for our product warranty costs based on certain estimates and our knowledge of current events and actions, our actual warranty costs may exceed our reserve, resulting in current period expenses and a need to increase our accruals for warranty charges. In

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addition, the reputation of our brand may be diminished by product defects and recalls. Further, our inability to cure a product defect could result in the failure of a product line or the temporary or permanent withdrawal from a product or market. Any of these events may have a material adverse impact on our financial condition, results of operations and cash flows.

• Our underfunded pension plans require future pension contributions which could limit our flexibility in managing our company

Due to the significant negative investment returns in 2008 and falling interest rates in recent years, the projected benefit obligations of our defined benefit pension plans exceeded the fair value of the plan assets by approximately $138 million at December 31, 2011. Beginning in 2008, our minimum required pension contributions equal our target normal cost plus a seven year amortization of any funding shortfall, offset by any Employee Retirement Income Security Act of 1974 (ERISA) credit balance. We are forecasting that there will be no required contributions to the plan in 2012, and we do not plan to make any voluntary contributions. However, we cannot provide any assurance that contributions will not be required in the future. Among the key assumptions inherent in our actuarially calculated pension plan obligation and pension plan expense are the discount rate and the expected rate of return on plan assets. If interest rates and actual rates of return on invested plan assets were to decrease significantly, our pension plan obligations could increase materially. The size of future required pension contributions could result in us dedicating a substantial portion of our cash flows from operations to making the contributions which could negatively impact our flexibility in managing the company.

• We have significant goodwill and an impairment of our goodwill could cause a decline in our net worth

Our total assets include significant goodwill. Our goodwill results from our acquisitions, representing the excess of the purchase prices we paid over the fair value of the net tangible and intangible assets we acquired. We assess whether there has been impairment in the value of our goodwill during the fourth quarter of each calendar year or sooner if triggering events warrant. If future operating performance at our businesses do not meet expectations, we may be required to reflect a non-cash charge to operating results for goodwill impairment. The recognition of an impairment of a significant portion of goodwill would negatively affect our results of operations and total capitalization, the affect of which could be material. A significant reduction in our stockholders’ equity due to an impairment of goodwill may affect our ability to maintain the debt-to-capital ratio required under our existing debt arrangements. We have identified the valuation of goodwill and indefinite-lived intangible assets as a critical accounting policy. See “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Policies—Goodwill and Indefinite-lived Intangible Assets” included in Item 7 of this Annual Report on Form 10-K.

• We purchased a water treatment company in late 2009 and we may encounter additional operational difficulties

We purchased 80 percent of the water treatment business of Tianlong in November 2009, and purchased the remaining 20 percent in the fourth quarter of 2010. We are operating the business as SWT. The successful operation of SWT will require substantial attention from our management which could decrease the time our management has to serve and attract customers. We cannot provide assurance that this acquisition will operate profitably or that it will be able to achieve the financial or operational success we expect from the acquisition. The progress of our water treatment business has been slower than anticipated due to a number of unforeseen challenges including lower than anticipated sales and the need to move the manufacturing facility sooner than planned. Our financial condition, results of operations and cash flows could be adversely affected if our other businesses suffer on account of the increased focus on the acquired business.

• A substantial contribution to our financial results has come through acquisitions and we intend to grow by acquisitions using a portion of the cash proceeds from the sale of EPC, and we may not be able to identify or complete future acquisitions, which could adversely affect our future growth

Acquisitions we have made over the last several years have had a significant impact on our results of operations. While we will continue to evaluate potential acquisitions and we intend to use a portion of the cash proceeds from the sale of EPC for future acquisitions, we may not be able to identify and successfully negotiate suitable acquisitions, obtain financing for future acquisitions on satisfactory terms, utilize cash flows from operations, obtain regulatory approval for certain acquisitions, or otherwise complete acquisitions in the future. If we complete any future acquisitions, then we may not be able to successfully integrate the acquired businesses or operate them profitably or accomplish our strategic objectives for those acquisitions. Our level of indebtedness may increase in the future if we finance acquisitions with debt, which would cause us to incur additional interest expense and could increase our vulnerability to general adverse economic and industry conditions and limit our ability to service our debt or obtain additional financing. We cannot assure you that future acquisitions will not have a material adverse affect on our financial condition, results of operations and cash flows.

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• We own a significant number of shares of RBC, and a decline in market value could occur prior to our sale of the shares

In addition to cash proceeds of approximately $760 million from the sale of EPC to RBC, we received approximately 2.83 million shares of RBC common stock. In 2011, we entered into an equity collar contract for 50 percent of the shares to protect a portion of the value of the stock. We are exposed to market fluctuations for the remaining 50 percent of the unhedged RBC shares. We do not intend to be long-term shareholders of RBC, and a decline in the market value of RBC shares prior to our sale of these shares could have a material adverse impact on the value of our holdings.

• Our results of operations may be negatively impacted by product liability lawsuits and claims

Our water heating and boiler products expose us to potential product liability risks that are inherent in the design, manufacture, sale and use of our products. While we currently maintain what we believe to be suitable product liability insurance, we cannot assure you that we will be able to maintain this insurance on acceptable terms, that this insurance will provide adequate protection against potential liabilities or that our insurance providers will successfully weather the current economic downturn. In addition, we self-insure a portion of product liability claims. A series of successful claims against us could materially and adversely affect our reputation and our financial condition, results of operations and cash flows.

• Changes in regulations or standards could adversely affect our business

Our products are subject to a wide variety of statutory, regulatory and industry standards and requirements. These include energy efficiency, climate emissions, labeling and safety-related requirements. While we believe our products are currently some of the most efficient, safest, and environment-friendly products available, a significant change to these regulatory requirements, whether federal, foreign, state or local, or otherwise to industry standards could substantially increase manufacturing costs, impact the size and timing of demand for our products, or put us at a competitive disadvantage, any of which could harm our business and have a material adverse effect on our financial condition, results of operations and cash flow.

• If we are unable to develop product innovations and improve our technology and expertise, we could lose customers or market share

Our success may depend on our ability to adapt to technological changes in the water heating, boiler and water treatment industry. If we are unable to timely develop and introduce new products, or enhance existing products, in response to changing market conditions or customer requirements or demands, our competitiveness could be materially and adversely affected.

• Certain members of the founding family of our company and trusts for their benefit have the ability to influence all matters requiring stockholder approval

We have two classes of common equity: our Common Stock and our Class A Common Stock. The holders of Common Stock currently are entitled, as a class, to elect only one-third of our board of directors. The holders of Class A Common Stock are entitled, as a class, to elect the remaining directors. Certain members of the founding family of our company and trusts for their benefit (Smith Family) have entered into a voting trust agreement with respect to shares of our Class A Common Stock and shares of our Common Stock they own. As of December 31, 2011 these members of the Smith Family own approximately 57.4 percent of the total voting power of our outstanding shares of Class A Common Stock and Common Stock, taken together as a single class, and approximately 87.1 percent of the voting power of the outstanding shares of our Class A Common Stock, as a separate class. Due to the differences in the voting rights between shares of our Common Stock and shares of our Class A Common Stock, the Smith Family is in a position to control to a large extent the outcome of matters requiring a stockholder vote, including the adoption of amendments to our certificate of incorporation or bylaws or approval of transactions involving a change of control. This ownership position may increase if other members of the Smith Family enter into the voting trust agreement, and the voting power relating to this ownership position may increase if shares of our Class A Common Stock held by stockholders who are not parties to the voting trust agreement are converted into shares of our Common Stock. The voting trust agreement provides that in the event one of the parties to the voting trust agreement wants to withdraw from the trust or transfer any of its shares of our Class A Common Stock, such shares of our Class A Common Stock are automatically exchanged for shares of our Common Stock held by the trust to the extent available in the trust. In addition, the trust will have the right to purchase the shares of our Class A Common Stock and our Common Stock proposed to be withdrawn or transferred from the trust. As a result, the Smith Family members that are parties to the voting trust agreement have the ability to maintain their collective voting rights in our company even if certain members of the Smith Family decide to transfer their shares.

9

ITEM 1B - UNRESOLVED STAFF COMMENTS

None.

ITEM 2 - PROPERTIES

Properties utilized by us at December 31, 2011 were as follows:

North America

This segment has 13 manufacturing plants located in six states and two non-U.S. countries, of which 11 are owned directly by us or our subsidiaries and two are leased from outside parties. Lease terms generally provide for minimum terms of one to ten years and have one or more renewal options. The terms of leases in effect at December 31, 2011 expire in 2012 and 2019.

Rest of World

This segment has six manufacturing plants located in three non-U.S. countries, of which three are owned directly by us or our subsidiaries and three are leased from outside parties. Lease terms generally provide for minimum terms of one to ten years and have one or more renewal options. The terms of leases in effect at December 31, 2011 expire between 2012 and 2018.

Corporate and General

We consider our plants and other physical properties to be suitable, adequate, and of sufficient productive capacity to meet the requirements of our business. The manufacturing plants operate at varying levels of utilization depending on the type of operation and market conditions. The executive offices of the company, which are leased, are located in Milwaukee, Wisconsin.

ITEM 3 - LEGAL PROCEEDINGS

We are involved in various unresolved legal actions, administrative proceedings and claims in the ordinary course of our business involving product liability, property damage, insurance coverage, exposure to asbestos and other substances, patents and environmental matters, including the disposal of hazardous waste. Although it is not possible to predict with certainty the outcome of these unresolved legal actions or the range of possible loss or recovery, we believe, based on past experience, adequate reserves and insurance availability, that these unresolved legal actions will not have a material effect on our financial position or results of operations. A more detailed discussion of certain of these matters appears in Note 16 of Notes to Consolidated Financial Statements.

ITEM 4 - MINE SAFETY DISCLOSURES

Not applicable.

10

EXECUTIVE OFFICERS OF THE COMPANY

Pursuant to General Instruction of G(3) of Form 10-K, the following is a list of the executive officers which is included as an unnumbered Item in Part I of this report in lieu of being included in our Proxy Statement for our 2012 Annual Meeting of Stockholders.

Name (Age)	Positions Held	Period Position Was Held
Stephen S. Anderson (63)	Senior Vice President – Manufacturing and Supply Chain	2011 to Present
	Senior Vice President – Manufacturing and Supply Chain – A. O. Smith Water Products Company	2004 to 2011
Randall S. Bednar (59)	Senior Vice President - Chief Information Officer	2007 to Present
	Senior Vice President – Information Technology	2006
	Vice President – Information Technology	2001 to 2006
	Vice President and Chief Information Officer – Gates Corporation	1996 to 2000
Wilfridus M. Brouwer (53)	President and General Manager - A. O. Smith (China) Investment Co., Ltd.	2009 to Present
	Senior Vice President – Asia	2009 to Present
	Executive Project Leader – Akzo Nobel	2007 to 2008
	Vice President Decorative Coatings; President Asia Operations - Akzo Nobel	2005 to 2007
	Global Sub Business Unit Manager - Akzo Nobel	2004 to 2005
Robert J. Heideman (45)	Senior Vice President – Engineering & Technology	2011 to Present
	Senior Vice President – Corporate Technology	2010 to 2011
	Vice President - Corporate Technology	2007 to 2010
	Director - Materials	2005 to 2007
	Section Manager	2002 to 2005
	Engineering Supervisor - Kohler Company	2001
Paul W. Jones (63)	Chairman and Chief Executive Officer	2005 to Present
	President	2004 to 2011
	Chief Operating Officer	2004 to 2005
	Chairman and Chief Executive Officer - U.S. Can Company	1998 to 2002
John J. Kita (56)	Executive Vice President and Chief Financial Officer	2011 to Present
	Senior Vice President, Corporate Finance and Controller	2006 to 2011
	Vice President, Treasurer and Controller	1996 to 2006
	Treasurer and Controller	1995 to 1996
	Assistant Treasurer	1988 to 1994

11

Name (Age)	Positions Held	Period Position Was Held
Mark A. Petrarca (48)	Senior Vice President – Human Resources and Public Affairs	2006 to Present
	Vice President – Human Resources and Public Affairs	2005 to 2006
	Vice President – Human Resources – A. O. Smith Water Products Company	1999 to 2004
Ajita G. Rajendra (60)	President and Chief Operating Officer	2011 to Present
	Executive Vice President	2006 to 2011
	President – A. O. Smith Water Products Company	2005 to 2011
	Senior Vice President	2005 to 2006
	Senior Vice President – Industrial Products Group, Kennametal Inc.	1998 to 2004
Steve W. Rettler (57)	Senior Vice President – Corporate Development	2006 to Present
	Vice President – Business Development	1998 to 2006
James F. Stern (49)	Executive Vice President, General Counsel and Secretary	2007 to Present
	Partner - Foley & Lardner LLP	1997 to 2006

12

PART II

ITEM 5 - MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

On October 11, 2010, our board of directors declared a three-for-two stock split of our Class A Common Stock and Common Stock in the form of a 50 percent stock dividend to stock holders of record on October 29, 2010 and payable on November 15, 2010. All references in this Item 5 to number of A. O. Smith shares or price per share have been adjusted to reflect the split.

(a) Market Information. Our Common Stock is listed on the New York Stock Exchange under the symbol AOS. Our Class A Common Stock is not listed. Wells Fargo Shareowner Services, N.A., P.O. Box 64854, St. Paul, Minnesota, 55164-0854 serves as the registrar, stock transfer agent and the dividend reinvestment agent for our Common Stock and Class A Common Stock.

Quarterly Common Stock Price Range

2011	1st Qtr.		2nd Qtr.		3rd Qtr.		4th Qtr.
High	$	44.66	$	44.82	$	44.74	$	41.04
Low		37.58		38.75		31.94		29.81
2010	1st Qtr.		2nd Qtr.		3rd Qtr.		4th Qtr.
High	$	35.68	$	37.76	$	39.28	$	42.89
Low		27.39		29.24		31.15		36.39

(b) Holders. As of January 31, 2012, the approximate number of shareholders of record of Common Stock and Class A Common Stock were 800 and 70, respectively.

(c) Dividends. Dividends declared on the common stock are shown in Note 18 of Notes to Consolidated Financial Statements appearing elsewhere herein.

(d) Stock Repurchases. On December 14, 2007 and further ratified on December 14, 2010, our board of directors approved a stock repurchase program authorizing the purchase of up to 1.5 million shares of our common stock. This stock repurchase authorization remains effective until terminated by our board of directors. As of December 31, 2011, we repurchased approximately 612,000 shares at an average price of $38.69 per share at a total cost of $23.5 million, and approximately 888,000 shares remain on the existing repurchase authorization.

ISSUER PURCHASES OF EQUITY SECURITIES
Period	Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Number of Shares that may yet be Purchased Under the Plans or Programs
October 1 – October 31, 2011		-		-		-		1,363,800
November 1 – November 30, 2011		292,689		37.19		292,689		1,071,111
December 1 – December 31, 2011		182,700		37.82		182,700		888,411

(e) Performance Graph. The following information in this Item 5 of this Annual Report on form 10-K is not deemed to be “soliciting material” or to be “filed” with the SEC or subject to Regulation 14A or 14C under the Securities Exchange Act of 1934 or to the liabilities of Section 18 of the Securities Exchange Act of 1934, and will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, except to the extent we specifically incorporate it by reference into such a filing.

13

The graph below shows a five-year comparison of the cumulative shareholder return on our Common Stock with the cumulative total return of the S&P Small Cap 600 Index and the Russell 1000 Index, both of which are published indices.

Comparison of Five-Year Cumulative Total Return

From December 31, 2006 to December 31, 2011

Assumes $100 Invested with Reinvestment of Dividends

	Base Period		INDEXED RETURNS
Company/Index		12/31/06		12/31/07	12/31/08	12/31/09	12/31/10	12/31/11
A. O. SMITH CORP		100.0		95.0	81.7	122.9	164.5	176.0
S&P SMALL CAP 600 INDEX		100.0		99.7	67.8	85.1	107.5	108.6
RUSSELL 1000 INDEX		100.0		105.8	66.0	84.8	98.4	99.9

14

ITEM 6 – SELECTED FINANCIAL DATA

The data presented below includes the impact of our merger transaction with Smith Investment Company (SICO) which closed on April 22, 2009 and is discussed further in the Consolidation section of Note 1 of the Notes to Consolidated Financial Statements.

(dollars in millions, except per share amounts)

	Years ended December 31
	2011(1),(2)		2010(3)		2009(4)			2008			2007
Net sales – continuing operations	$	1,710.5	$	1,489.3	$	1,375.0		$	1,451.3		$	1,423.1
Earnings
Continuing operations		111.2		57.1		60.5			47.2			62.5
Discontinued operations		194.5		54.4		29.1			30.1			28.3
Net earnings		305.7		111.5		89.6			77.3			90.8
Net loss (earnings) attributable to noncontrolling interest:
Continuing operations		-		0.2		(9.6	)		(35.0	)		(44.1	)
Discontinued operations		-		-		1.3			(20.6	)		(16.3	)
Net earnings attributable to A. O. Smith Corporation	$	305.7	$	111.7	$	81.3		$	21.7		$	30.4
Basic earnings per share of common stock(3)
Continuing operations	$	2.41	$	1.25	$	1.48		$	0.86		$	1.29
Discontinued operations		4.22		1.19		0.89			0.67			0.85
Net earnings	$	6.63	$	2.44	$	2.37		$	1.53		$	2.14
Diluted earnings per share of common stock(3)
Continuing operations	$	2.39	$	1.24	$	1.48		$	0.86		$	1.29
Discontinued operations		4.18		1.18		0.88			0.67			0.85
Net earnings	$	6.57	$	2.42	$	2.36		$	1.53		$	2.14
Cash dividends per common share(3)	$	0.60	$	0.54	$	0.51		$	0.49		$	0.47
	December 31
	2011		2010		2009			2008			2007
Total assets	$	2,349.0	$	2,110.6	$	1,973.0		$	1,982.7		$	1,973.0
Long-term debt(5)		443.0		242.4		232.1			317.3			387.6
Total stockholders’ equity		1,085.8		881.4		789.8			663.2			793.7

⁽¹⁾  In August 2011, we sold EPC which is reflected as a discontinued operation for all periods presented.

⁽²⁾  In August 2011, we acquired Lochinvar.

⁽³⁾  In October 2010, we declared a 50 percent stock dividend to holders of Common Stock and Class A Common Stock which is not included in cash dividends. Basic and Diluted earnings per share are calculated using the weighted average shares outstanding which were restated for all periods presented to reflect the stock dividend.

⁽⁴⁾  In November 2009, we acquired an 80 percent interest in the water treatment business of Tianlong. In the fourth quarter of 2010, we acquired the remaining 20 percent interest in the water treatment business of Tianlong. We are operating the business as SWT.

⁽⁵⁾  Excludes the current portion of long-term debt.

15

ITEM 7 - MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

OVERVIEW

We are a leading manufacturer of water heaters and boilers, serving a diverse mix of residential and commercial end markets principally in the U.S. with a strong and growing international presence. During the fourth quarter of 2011, we reorganized our management reporting structure to reflect our current business activities. Historical information has been revised to reflect our new structure. Our company is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential and commercial gas, gas tankless, oil and electric water heaters. Both segments primarily manufacture and market in their respective region of the world. The North America segment also manufactures and globally markets specialty commercial water heating equipment, condensing and non-condensing boilers and water systems tanks. The Rest of World segment also manufactures and markets water treatment products, primarily for Asia. On August 22, 2011, we sold EPC to RBC for approximately $760 million in cash and approximately 2.83 million shares of RBC common stock valued at $140.6 million as of that date. Due to the sale, EPC has been reflected as discontinued operations in the accompanying financial statements for all periods presented. In 2011, sales for our North America segment were $1,289.5 million, sales for our Rest of World segment were $455.6 million and discontinued operations EPC sales were $531.8 million.

Sales of our Rest of World A. O. Smith branded products in China grew significantly in 2011. We expect sales of A. O. Smith branded products in China to grow approximately twice as fast as the rate of China’s Gross Domestic Product (GDP) in 2012, as geographic expansion, market share gains and new product introductions contribute to our growth. The residential and commercial markets for our North America segment remain weak due to the relatively low number of housing starts and lack of commercial construction activity, although residential and commercial replacement demand significantly supported our sales in 2011. Our 2011 North America residential sales were essentially flat compared to the prior year and commercial sales showed slight growth, largely in anticipation of a regulatory change in 2012. We expect the North America residential water heater industry unit growth to be flat for 2012 and expect a modest decline in commercial industry units. Our recently acquired residential and commercial boiler operations (more completely described below) added approximately $76 million to our North America sales in 2011, and we expect this business to grow over ten percent in 2012, driven by sales of energy efficient products.

We recognized a pretax charge of $35.4 million in 2010 for expenses related to damages to our water heater manufacturing facility located in Ashland City, TN caused by flooding of the Cumberland River. This facility was temporarily shut down and production of water heaters was transferred to our other water heater manufacturing facilities in the U.S., Canada and Mexico. Our recovery from the impact of the flood was essentially completed by year end 2010. We lost some sales orders in 2010 due to the flood, however, we retained all customers from which we lost orders.

We purchased the remaining 20 percent interest in SWT from our former partner in the fourth quarter of 2010 and now own 100 percent of this company. The progress of our water treatment business has been slower than anticipated due to a number of unforeseen challenges including the need to move the manufacturing facility sooner than planned. We incurred losses in 2011 and in 2010. We continue to expect strong long term sales growth opportunities in the water treatment industry in China. We introduced A. O. Smith branded water treatment products into our China distribution network during 2010 and now sell these products in over 900 outlets.

During the second quarter of 2010, we began production of residential water heaters for the Indian market at our new plant located just outside of Bangalore, India. In 2011, sales in our India water heater operations more than doubled to $18.1 million compared to the prior year.

On July 1, 2010, we acquired the rights from Takagi to market tankless water heaters in North America and entered into a long-term agreement with Takagi to supply tankless water heaters. As part of the venture, we took over the management of Takagi’s North American sales and distribution organization. Through this venture, we offer a full line of gas tankless water heaters under our own brands in association with the Takagi brand. In 2011, we estimate the industry sold approximately 440,000 tankless water heaters in North America.

On October 11, 2010, our board of directors declared a three-for-two stock split of our Class A Common Stock and Common Stock in the form of a 50 percent stock dividend to stock holders of record on October 29, 2010 and payable on November 15, 2010.

We intend to take advantage of our strong balance sheet and the remaining proceeds from the sale of EPC to execute on a number of our water related strategic initiatives. We will look to continue to grow our core residential and commercial water heating, boiler and water treatment businesses in our existing operations in the high growth regions of China and India. We will look to expand into additional fast growing geographic markets such as South America, Southeast Asia and Africa via acquisition or via using our existing manufacturing locations in China and India as export platforms.

16

We intend to expand our core product lines in the areas of water heaters, boilers and water treatment products through acquisitions, joint ventures or other business relationships. Finally, we will pursue opportunities in new and unique technologies as well as water themed adjacencies that will be attractive to our customers and channel partners and will leverage our core competencies to create shareholder value.

Consistent with our stated strategy to expand our core product offering with new technologies, on August 26, 2011, we acquired Lochinvar for approximately $421 million plus an earnout of up to $35 million if certain revenue objectives are achieved by November 2012. Lochinvar, one of the leading manufacturers of residential and commercial boilers in the U.S., fits squarely within our stated strategic growth initiative to expand our core water heating business. Lochinvar’s sales for the twelve months ended November 30, 2011 (Lochinvar’s former fiscal year end) were approximately $200 million and have grown at an eight percent compound annual growth rate over the last five years. The boiler market in the U.S. has been transitioning to higher efficiency, condensing boilers for the last several years. In 2010, about 25 percent of boilers sold in the U.S. were condensing boilers, compared with five percent eight years ago. Lochinvar is a leading manufacturer of condensing boilers as well as an innovator of new, higher efficiency boilers. We expect the transition in the U.S. to higher efficiency boilers will continue into the foreseeable future and, as a result, we expect sales of Lochinvar’s products will likely continue to grow more than ten percent in 2012. We paid the purchase price for Lochinvar using a combination of cash on hand and amounts that we borrowed under our $425 million credit facility.

LIQUIDITY AND CAPITAL RESOURCES

We achieved net earnings inclusive of discontinued operations and noncontrolling interest of $305.7 million or $6.57 per diluted share in 2011 compared with $111.7 million or $2.42 per diluted share in 2010 and $81.3 million or $2.36 per diluted share in 2009. Our 2011 earnings include $194.5 million, or $4.18 per diluted share, related to EPC, as well as an after-tax gain of $12.9 million, or $.28 per diluted share, associated with our shares of RBC, a legal settlement with a component supplier and an increase to a warranty reserve associated with a similar component in Canada. Our newly acquired Lochinvar business contributed $.07 per diluted share to full year earnings, which included interest expense and $.10 per diluted share of non-recurring professional fees and purchase accounting charges. Our 2010 earnings include an after-tax $21.6 million or $0.47 per diluted share charge for the flooding of our Ashland City, TN water heater plant in May 2010 as well as $54.4 million or $1.18 per diluted share from EPC. Our 2009 reported earnings and earnings per share include $29.1 million or $.88 per diluted share from EPC and have been impacted by required accounting related to our transaction with Smith Investment Company (SICO), which closed on April 22, 2009 and is discussed in more detail in Note 1 of the Notes to Consolidated Financial Statements. For accounting purposes, the former controlling shareholder, SICO, is treated as the acquirer even though we (A. O. Smith Corporation) are the surviving corporation from a legal standpoint. Earnings and earnings per share amounts reported by us for 2009 include SICO earnings and shares outstanding as adjusted for the exchange ratio of the merger transaction prior to the closing date.

The primary accounting impact of the SICO transaction is in the calculation of earnings per share because the accounting rules require the use of SICO adjusted average shares outstanding prior to closing. The SICO transaction did not impact 2011 or 2010 results. Eliminating the impact of the transaction as set forth in the table below, non generally accepted accounting principles (GAAP) net earnings (including net earnings from discontinued operations) in 2009 were $89.7 million or $1.97 per diluted share.

We believe that presenting non-GAAP financial information permits investors to compare our financial results for the current period to our historical results for the periods reported. Although 2011 and 2010 financial information was not affected by the transaction, 2009 full year and previously reported periods were impacted. Management also uses the non-GAAP information for all internal purposes of reporting results of operations including return on investment measures utilized in determining certain incentive-based compensation and employee profit sharing amounts. Below is a reconciliation of GAAP to non-GAAP earnings and earnings per share as discussed above.

17

A. O. Smith Corporation

Reconciliation of Non-GAAP Data

In millions, except per share amounts

	Total Year
	2009			2008			2007
Continuing earnings, as reported	$	60.5		$	47.2		$	62.5
Deduct: Net earnings attributable to non-controlling interest for continuing operations		(9.6	)		(35.0	)		(44.1	)
Continuing earnings used to calculate earnings per share as reported	$	50.9		$	12.2		$	18.4
Add: Non-GAAP adjustments attributable to net earnings of non-controlling interest for continuing operations and SICO expenses		9.7			39.3			45.8
Continuing earnings as adjusted	$	60.6		$	51.5		$	64.2
Net earnings, as reported	$	81.3		$	21.7		$	30.4
Add: Non-GAAP adjustments attributable to net earnings of non-controlling interest and SICO expenses		8.4			60.2			57.8
Net earnings as adjusted	$	89.7		$	81.9		$	88.2
Average common shares outstanding, as reported		34.5			14.2			14.2
Add:Non-GAAP adjustments to weighted average common shares attributable to non-controlling interest		11.0			31.2			32.3
Adjusted average common shares outstanding		45.5			45.4			46.5
Earnings per diluted share:
Continuing earnings per share, as reported	$	1.48		$	0.86		$	1.29
Continuing earnings per share, as adjusted	$	1.33		$	1.13		$	1.38
Net earnings per share, as reported	$	2.36		$	1.53		$	2.14
Net earnings per share, as adjusted	$	1.97		$	1.80		$	1.90

Although 2011 and 2010 financial information was not affected by the transaction, 2009 full year and previously reported periods were impacted. The non-GAAP presentation of adjusted earnings per share should not be construed as an alternative to the results reported in accordance with U.S. GAAP. It is provided solely to assist in the investor’s understanding of the impact of these items on the comparability of the company’s operations

⁽¹⁾  Reported shares are calculated as the weighted average of SICO shares prior to the closing and A. O. Smith shares after the closing. All share amounts were adjusted to retroactively reflect in all periods presented our 50 percent stock dividend which occurred on October 11, 2010.

Our results of continuing operations will be discussed later in this section and our discontinued operation’s financial information is provided in Note 2 of the Notes to Consolidated Financial Statements.

Our working capital was $720.3 million at December 31, 2011 compared with $209.5 million and $121.7 million at December 31, 2010 and December 31, 2009 respectively. The majority of the $510.8 million increase in working capital in 2011 was due to the receipt of cash and RBC shares from the sale of EPC, which closed in the third quarter, less the cash used in the acquisition of Lochinvar, and, to a lesser extent, the working capital related to the purchase of Lochinvar. The $87.8 million increase in working capital in 2010 resulted from higher cash levels outside the U.S., sales related increases late in the year in accounts receivable and higher inventory levels to support higher sales, new businesses and new product launches, which were partially offset by higher accounts payable balances related to higher sales. As of December 31, 2011, $463.3 million of cash and cash equivalents were held by our foreign subsidiaries.

Operating cash provided by continuing operations during 2011 was $61.0 million compared with $63.3 million during 2010 and $122.9 million during 2009. Higher earnings in 2011 and improved working capital were more than offset by $107 million of after tax pension contributions, resulting in lower operating cash flows in 2011 than in 2010. The increase in our working capital needs in 2010 compared with a decline in the previous year explain the majority of the decline in 2010 operating cash flows as compared with 2009. We expect our cash provided by operating activities less the expected earn-out related to Lochinvar in 2012 to be approximately $145 to $155 million, an improvement from 2011 primarily due to the expected absence of pension contributions.

18

Our capital expenditures for continuing operations were $53.5 million in 2011, the same as in 2010. Capital expenditures in 2010 were higher than the $42.7 million spent in 2009 as a result of $18.5 million in capital spending related to the flooding in May 2010. We are projecting 2012 capital expenditures of between $80 and $90 million and 2012 depreciation and amortization of approximately $55 million. Capital spending in 2012 will include approximately $40 million to begin construction of a second water heater manufacturing plant in Nanjing, China to meet local demand. The new plant is expected to add 50 percent more capacity to our China water heater operations. We also plan to expand our India plant to accommodate more water heater models, in-source some component manufacturing and meet local demand. We expect our 2012 depreciation and amortization will be approximately $8 million higher than 2011 primarily related to Lochinvar.

In November 2010, we completed a $425 million multi-currency three year revolving credit facility with a group of eight banks. The facility has an accordion provision which allows it to be increased up to $525 million if certain conditions (including lender approval) are satisfied. Borrowing rates under the facility are determined by our leverage ratio. The facility requires us to maintain two financial covenants, a leverage ratio test and an interest coverage test, and we were in compliance with the covenants as of December 31, 2011.

The facility backs up commercial paper and credit line borrowings, and it expires on November 12, 2013. As a result of the long-term nature of this facility, the commercial paper and credit line borrowings, as well as drawings under the facility are classified as long-term debt. At December 31, 2011, we had available borrowing capacity of $61.1 million under this facility. In addition, the value of our RBC shares as of December 31, 2011 was $144.4 million and we do not intend to be long-term shareholders of RBC. We believe that the combination of cash, available borrowing capacity, proceeds from the sale of RBC shares and operating cash flow will provide sufficient funds to finance our existing operations for the foreseeable future.

Our total debt increased to $461.6 million at December 31, 2011 compared with $261.0 million at December 31, 2010, due to the purchase of Lochinvar. As a result, our leverage, as measured by the ratio of total debt to total capitalization, was 29.8 percent at the end of 2011 compared with 22.8 percent at the end of 2010.

Our U.S. pension plan continues to meet all funding requirements under ERISA regulations. While we were required to make a minimal contribution to the plan in 2011, we elected to make contributions of $175.0 million. We are forecasting that there will be no required contributions to the plan in 2012, and we do not plan to make any voluntary contributions. For further information on our pension plans, see Note 12 of the Notes to Consolidated Financial Statements.

In December 2010, our board of directors ratified its authorization of a stock repurchase program in the amount of 1.5 million shares of our common stock. During 2011, we repurchased approximately 612,000 shares at an average price of $38.69 per share for a total amount of $23.5 million. A total of approximately 888,000 remain in the existing repurchase authority.

We have paid dividends for 72 consecutive years with payments increasing each of the last 20 years. We paid total dividends of $.60 per share in 2011 compared with $.54 per share in 2010.

Aggregate Contractual Obligations

A summary of our contractual obligations as of December 31, 2011, is as follows:

(dollars in millions)			Payments due by period
Contractual Obligations	Total		Less Than 1 year		1 - 2 Years		3 - 5 Years		More than 5 years
Long-term debt	$	461.6	$	18.6	$	396.9	$	28.9	$	17.2
Fixed rate interest		16.1		5.0		6.9		3.4		0.8
Operating leases		50.5		12.4		16.1		11.1		10.9
Purchase obligations		76.1		76.1		-		-		-
Pension and post-retirement obligations		81.9		1.0		46.6		14.8		19.5
Total	$	686.2	$	113.1	$	466.5	$	58.2	$	48.4

As of December 31, 2011, our liability for uncertain income tax positions was $1.8 million. Due to the high degree of uncertainty regarding timing of potential future cash flows associated with these liabilities, we are unable to make a reasonably reliable estimate of the amount and period in which these liabilities might be paid.

We utilize blanket purchase orders to communicate expected annual requirements to many of our suppliers. Requirements under blanket purchase orders generally do not become committed until several weeks prior to our scheduled unit production. The purchase obligation amount presented above represents the value of commitments that we consider firm.

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RESULTS OF OPERATIONS

Our sales from continuing operations in 2011 were $1,710.5 million, surpassing 2010 sales of $1,489.3 million by 14.9 percent. The increase in sales was attributable mostly to our recently acquired Lochinvar business which added $75.9 million in sales and higher sales of A. O. Smith branded products in China which grew 29.0 percent to $371.7 million for the year. Pricing actions related to higher raw material costs, higher commercial water heater volumes and a full year of sales of gas tankless products in North America also contributed to the increased sales. Our sales from continuing operations were $1,375.0 million in 2009. The $114.3 million increase in sales from 2009 to 2010 was due to higher sales in China resulting from geographic expansion, market share gains and new product introductions as well as additional sales from our water treatment business acquired in November of 2009.

In the fourth quarter of 2011, we evaluated our segment reporting subsequent to the sale of EPC and the purchase of Lochinvar and reorganized our management reporting structure to reflect our current business activities and concluded that reporting two geographic segments would more closely align our financial reporting with how we manage our overall business. Commencing with this Annual Report on Form 10-K, our company is comprised of two reporting segments: North America and Rest of World. Sales and earnings results for these new reporting segments are discussed later in the Results of Operations and have been restated for all periods presented.

Our gross profit margin for continuing operations in 2011 was 30.0 percent, about equal to the 29.9 percent margin in 2010. The impact of the addition of relatively higher margin sales from our Lochinvar acquisition and increased sales of A. O. Smith branded products in China in 2011 was offset by a decline in margin in our water treatment products and higher material costs. Our gross profit margin increased from 28.7 percent in 2009 to 29.9 percent in 2010. The improved margins were due to increased volume, cost containment activities and lower warranty costs which more than offset certain inefficiencies resulting from the May 2010 flood in our Ashland, TN manufacturing facility.

Selling, general and administrative expense (SG&A) was $44.1 million higher in 2011 than in 2010. The increase in SG&A in 2011 was due to higher selling and advertising costs in support of increased volumes in China and $15.9 million of additional expenses from Lochinvar operations. SG&A increased by $36.9 million from 2009 to 2010 resulting mostly from incremental selling costs to support higher volumes and new product lines in China.

Pension expense for continuing operations in 2011 was $3.3 million compared to $10.5 million in 2010 and $8.8 million in 2009. The decrease in pension expense in 2011 from 2010 was due to $175 million of contributions made during 2011. The increase in pension expense in 2010 from 2009 was due to a decrease in the discount rate and increased amortization of deferred asset losses.

We purchased the remaining 20 percent interest in SWT from our former partner in the fourth quarter of 2010 and own 100 percent of this water treatment company. At the same time, we also settled certain disputes with our former partner relative to the condition of SWT on the date of purchase. The settlement resulted in a $5.0 million non-taxable gain. Additionally, we incurred an impairment charge of $3.3 million related to the value of trademarks we received as part of the SWT acquisition. We also moved the water treatment operations to Nanjing, China to recognize synergies associated with our strong management team and the engineering center in place at our water heater operations in that city. As a result of the announced move in 2010, we recorded $1.8 million in moving costs during the fourth quarter of 2010. The net impact of the aforementioned transactions associated with our SWT operation was a $.1 million pre-tax expense for restructuring, impairment and settlement income in 2010. Corporate expense in 2009 included $1.3 million of restructuring charges, the majority of which were associated with the loss on sale of a vacated facility from a previously owned business.

Interest expense, net of the amount allocated to discontinued operations, was $9.3 million, $6.9 million and $7.2 million in 2011, 2010 and 2009, respectively. Interest expense that could not be attributed to specific entities within the company was allocated to EPC based on the ratio of net assets to be sold to the sum of consolidated net assets and debt exclusive of debt attributable to specific entities of the company. The $2.4 million increase in continuing interest expense from 2010 to 2011 included $1.9 million associated with the debt incurred relative to the Lochinvar acquisition with the remainder of the increase being attributable to higher interest rates. The decline in continuing interest expense in 2010 from 2009 was due to lower debt levels.

Net other income was $19.8 million in 2011 and compared to net other expense of $.5 million and $2.8 million in 2010 and 2009, respectively. We closed on the sale of EPC to RBC on August 22, 2011 and received approximately 2.83 million RBC common shares as part of the sale proceeds. The RBC share price appreciated in the first quarter of 2011 during which we entered into an equity collar contract for 50 percent of the shares to protect a portion of the appreciation. The put strike price of the equity collar is $63.29 and the call strike price of the collar is $77.32. The RBC share price on December 31, 2011 was $50.97. The collar did not qualify for hedge accounting and therefore is adjusted to fair value on a quarterly basis through earnings from continuing operations. The company is required to make cash or stock deposits on unrealized losses on the

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equity collar that exceed $25.0 million. The mark to market accounting for the RBC shares and hedge will continue until the equity collar contract expires in March 2012. At the end of 2011, the contract was marked to market under accounting rules, resulting in a $17.9 million pretax gain during 2011. The market price of the RBC shares we received increased by $1.36 per share from the date of the sale of EPC until the end of 2011 resulting in a $1.9 million pretax gain on the 50 percent of shares covered by the collar contract. The resulting net gain on RBC shares activity of $19.8 million in 2011 was recorded in other income from continuing operations. The unrealized gain on the RBC shares not covered by the contract was reflected on an after-tax basis in other comprehensive income. The decline in other expense in 2010 from 2009 was due to a $2.4 million gain on the sale of a vacant parcel of land adjacent to our Ashland City, TN facility in 2010.

Our effective tax rate for continuing operations was 31.1 percent in 2011, 23.3 percent in 2010 and 33.7 percent in 2009. The relatively low effective tax rate in 2010 was due to lower domestic earnings as a result of the $35.4 million pre-tax flood related expense as well as higher 2010 foreign earnings which were in lower tax jurisdictions.

Our 2011 net earnings were $305.7 million or $6.57 per diluted share compared with $111.7 million or $2.42 per diluted share in 2010 and $81.3 million or $2.36 per diluted share in 2009. On a non-GAAP basis, 2009 earnings were $89.7 million or $1.97 per diluted share. Earnings in 2011 and 2010 were not affected by the SICO merger transaction. Please refer to Liquidity and Capital Resources for further discussion of net earnings.

North America

Sales for our North America segment were $1,289.5 million in 2011 or $134.1 million higher than sales of $1,155.4 million in 2010. The sales increase in 2011 included $75.9 million of sales from our Lochinvar acquisition completed on August 26, 2011. Our commercial water heater volumes were also higher in 2011 in advance of a pending regulatory change in Southern California. A material related price increase effective in April 2011 and a full year of sales of gas tankless products also contributed to increased sales in 2011. Our North America sales of $1,155.4 million in 2010 were $19.5 million higher than sales of $1,135.9 million in 2009 resulting from higher sales in Canada and additional sales derived from our purchase of the right to market and sell gas tankless water heaters in July of 2010.

Operating earnings for North America were $154.0 million in 2011 or $62.8 million higher than earnings of $91.2 million in 2010. Operating earnings in 2010 were adversely impacted by a pretax charge of $35.4 million for flood damage to our water heater manufacturing facility located in Ashland City, TN in May 2010. This facility was temporarily shut down and production of water heaters was transferred to our other water heater manufacturing facilities in the U.S., Canada and Mexico. The total direct cost for the flood damage was $67.3 million and included: repair of buildings and equipment, site cleanup and restoration and write-off of inventory and fixed assets. Insurance proceeds were $31.9 million resulting in a net charge for direct flood expenses of $35.4 million. Additional detail is provided in Note 14 of the Notes to Consolidated Financial Statements. Also, included in 2011 is an $11.2 million pre-tax gain for recovery of costs and damages associated with a legal settlement relating to an issue with a component part supplied by one of our vendors. This gain is reflected in the “Restructuring, impairment and settlement (income) expense-net” line in the accompanying financial statements. The $11.2 million gain was partially offset by $8.2 million of product warranty expense associated with a similar component issue in Canada and recorded as cost of products sold in 2011. The increased operating earnings in 2011 when compared to 2010 excluding the above items were due primarily to $13.0 million of operating profit contributed by our Lochinvar acquisition. Operating earnings were $91.2 million in 2010 or $24.6 million less than earnings of $115.8 million in 2009. The lower earnings in 2010 resulted from the $35.4 million pre-tax flood expense which more than offset the impact of higher volumes in Canada and commercial products.

The operating margin for the North America segment was 11.9 percent in 2011 compared to 11.0 percent in 2010 excluding the $35.4 million of flood related expense. The improved margin in 2011 was due mostly to the addition of higher margin Lochinvar products as well as increased volumes of relatively higher margin commercial products. The operating margin in 2009 was 10.2 percent. The improved margin in 2010 from 2009 was due to cost containment activities and lower warranty costs which more than offset certain inefficiencies resulting from the May 2010 flood in our Ashland City, TN manufacturing facility.

Rest of World

Sales for our Rest of World segment in 2011 were $455.6 million or $86.7 million higher than sales of $368.9 million in 2010. Sales of A. O. Smith branded products in China grew by $83.8 million to $371.7 million and sales in India more than doubled to $18.1 million in 2011. Sales for SWT were $13.0 million lower in 2011 than 2010 primarily due to inefficiencies as a result of the move of the manufacturing facility. Sales for our Rest of World segment in 2009 were $256.5 million. The increase in sales in 2010 was due mostly to significantly higher sales of A. O. Smith branded products in China resulting from geographic expansion, market share gains and new product introductions as well as additional sales from SWT acquired in November 2009.

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Operating earnings for our Rest of World segment were $42.7 million in 2011 compared to 2010 earnings of $42.4 million as increased earnings for our A. O. Smith branded products in China were offset by losses at SWT of $10.6 million in 2011 compared to losses of $3.2 million in 2010. Rest of World operating earnings were $33.0 million in 2009. The increase in earnings in 2010 from 2009 of $9.4 million was due mostly to higher earnings for A. O. Smith branded products. The operating margins for our Rest of World segment were 9.4 percent, 11.5 percent and 12.9 percent in 2011, 2010 and 2009, respectively. The decline in margin in 2011 was primarily due to losses at SWT resulting from lower sales and costs associated with moving to a new manufacturing facility in 2011. The increase in margin in 2010 from 2009 was due mostly to increased volumes of A. O. Smith branded products in China.

Critical Accounting Policies

Our accounting policies are described in Note 1 of Notes to Consolidated Financial Statements. Also as disclosed in Note 1, the preparation of financial statements in conformity with accounting principles generally accepted in the U.S. requires the use of estimates and assumptions about future events that affect the amounts reported in the financial statements and accompanying notes. Future events and their effects cannot be determined with absolute certainty. Therefore, the determination of estimates requires the exercise of judgment. Actual results inevitably will differ from those estimates, and such differences may be material to the financial statements.

The most significant accounting estimates inherent in the preparation of our financial statements include estimates associated with the evaluation of the impairment of goodwill and indefinite-lived intangible assets, as well as significant estimates used in the determination of liabilities related to warranty activity, product liability, and pensions. Various assumptions and other factors underlie the determination of these significant estimates. The process of determining significant estimates is fact-specific and takes into account factors such as historical experience and trends, and in some cases, actuarial techniques. We constantly reevaluate these significant factors and adjustments are made when facts and circumstances dictate. Historically, actual results have not significantly deviated from those determined using the estimates described above.

Goodwill and Indefinite-lived Intangible Assets

In conformity with U.S. GAAP, goodwill and indefinite-lived intangible assets are tested for impairment annually, or more frequently if events or changes in circumstances indicate that the assets might be impaired. We perform impairment reviews for our reporting units using a fair-value method based on management’s judgments and assumptions. The fair value represents the estimated amount at which a reporting unit could be bought or sold in a current transaction between willing parties on an arms-length basis. The estimated fair value is then compared with the carrying amount of the reporting unit, including recorded goodwill. We are subject to financial statement risk to the extent that goodwill and indefinite-lived intangible assets become impaired. Any impairment review is, by its nature, highly judgmental as estimates of future sales, earnings and cash flows are utilized to determine fair values. However, we believe that we conduct annual thorough and competent valuations of goodwill and indefinite-lived intangible assets and that there has been no impairment in goodwill in 2011. However, in the fourth quarter of 2010, we recorded a $3.3 million impairment charge for trademarks recorded as part of the SWT acquisition.

Product warranty

Our products carry warranties that generally range from one to ten years and are based on terms that are generally accepted in the market. We provide for the estimated cost of product warranty at the time of sale. The product warranty provision is estimated based upon warranty loss experience using actual historical failure rates and estimated costs of product replacement. The variables used in the calculation of the provision are reviewed on a periodic basis. At times, warranty issues may arise which are beyond the scope of our historical experience. While our warranty costs have historically been within calculated estimates, it is possible that future warranty costs could differ significantly from those estimates. We provide for any such warranty issues as they become known and estimable. The allocation of the warranty liability between current and long-term is based on the expected warranty liability to be paid in the next year as determined by historical product failure rates.

Product liability

Due to the nature of our products, we are subject to product liability claims in the normal course of business. We maintain insurance to reduce our risk. Most insurance coverage includes self-insured retentions that vary by year. As of December 31, 2011, we maintained a self-insured retention of $5.0 million per occurrence with an aggregate insurance limit of $125.0 million per occurrence.

GSW Inc. (GSW) insurance coverage included self-insurance retentions that varied by business segment and by year. Effective April 3, 2006, GSW maintained a $25.0 million aggregate loss retention through self-insurance and captive insurance company coverage. GSW claims occurring on or after July 1, 2006 are covered under our insurance program.

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We establish product liability reserves for our self-insured retention portion of any known outstanding matters based on the likelihood of loss and our ability to reasonably estimate such loss. There is inherent uncertainty as to the eventual resolution of unsettled matters due to the unpredictable nature of litigation. We make estimates based on available information and our best judgment after consultation with appropriate advisors and experts. We periodically revise estimates based upon changes to facts or circumstances. We also use an actuary to calculate reserves required for estimated incurred but not reported claims as well as to estimate the effect of adverse development of claims over time.

Pensions

We have significant pension benefit costs that are developed from actuarial valuations. The valuations reflect key assumptions regarding, among other things, discount rates, expected return on assets, retirement ages, and years of service. Consideration is given to current market conditions, including changes in interest rates in making these assumptions. Our assumption for the expected rate of return on plan assets was 8.75 percent in 2011. The discount rate used to determine net periodic pension costs decreased to 5.35 percent in 2011 from 5.80 percent in 2010. In 2012, the forecasted rate of return on plan assets is 8.50 percent and the discount rate is 4.90 percent.

In developing our expected long-term rate of return assumption, we evaluate our pension plan’s current and target asset allocation, the expected long-term rates of return of equity and bond indices and the actual historical returns of our pension plan. Our plan’s target allocation to equity managers is between 50 to 60 percent, with the remainder allocated primarily to bond managers and a small allocation to private equity managers. Our actual asset allocation as of December 31, 2011, was 55 percent to equity managers, 37 percent to bond managers, five percent to private equity managers and the remainder in money market instruments. We regularly review our actual asset allocation and periodically rebalance our investments to our targeted allocation when considered appropriate. Our pension plan’s historical ten-year and 25-year compounded annualized returns are 5.5 percent and 9.2 percent, respectively. We believe that with our target allocation and the expected long-term returns of equity and bond indices as well as our actual historical returns, our 8.50 percent expected return on assets for 2012 is reasonable.

The discount rate assumptions used to determine future pension obligations at December 31, 2011 were based on the Aon Hewitt AA Only Above Median yield curve, which was designed by Aon Hewitt to provide a means for plan sponsors to value the liabilities of their postretirement benefit plans. The AA Only Above Median curve represents a series of annual discount rates from bonds with AA minimum average rating as rated by Moody’s Investor Service (Moody’s), Standard & Poor’s (S&P) and Fitch. The discount rate assumptions used to determine future pension obligations at December 31, 2010 and 2009 were based on the Hewitt top quartile yield Curve (HTQ). The HTQ was a hypothetical double A yield curve represented by a series of annualized individual discount rates. Each bond issue underlying the HTQ was required to have a rating of Aa or better by Moody’s or a rating of AA or better by S&P. Aon Hewitt no longer supports the previous yield curve model and the AA Only Above Median yield curve closely follows the previous yield curve. The discount rates determined on the basis described above were 4.90 percent, 5.35 percent and 5.80 percent at December 31, 2011, 2010 and 2009, respectively. We will continue to evaluate our actuarial assumptions at least annually, and we will adjust the assumptions as necessary.

We estimate that we will recognize approximately $13.5 million of pension expense in 2012 compared to $3.3 million in 2011. The increase in 2012 expense is due to the decrease in both the discount rate and the expected return on plan assets. Lowering the expected long-term rate of return on assets by 25 basis points would increase our net pension expense for 2012 by approximately $2.1 million. Lowering the discount rate by 25 basis points would increase our 2012 net pension expense by approximately $1.3 million.

Recent Accounting Pronouncements

In June 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-05, “Comprehensive Income (Topic 220): Presentation of Comprehensive Income.” ASU No. 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of shareholders’ equity. ASU 2011-05 will be effective for the quarter ending March 31, 2012. The adoption of this guidance will have no impact on our financial condition or results of operations but will impact the presentation of our financial statements. We are currently evaluating the presentation options.

In September 2011, the FASB issued ASU No. 2011-08, “Testing of Goodwill for Impairment (Topic 350)”. ASU No. 2011-08 allows companies to assess qualitative factors to determine whether the two-step quantitative goodwill impairment test needs to be performed. Under the option, an entity no longer would be required to calculate the fair value of a reporting unit unless it determines, based on that qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. The ASU may change how a company tests goodwill for impairment but should not change the timing or measurement of goodwill impairments. ASU 2011-08 will be effective for the year ending December 31, 2012. We are currently reviewing the standard for applicability.

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Outlook

We continued to demonstrate that we can be successful in creating shareholder value without a benefit from new construction or a stable economy, and we believe we are well-positioned for future growth when new construction and the economy experience a sustained recovery. Our balance sheet and cash flow are strong and will support our active acquisition opportunities, our replacement water heater business in North America remains stable, and we are well established in China and India. The addition of Lochinvar and its potential to grow in both the domestic and international markets is another positive, which we expect will add $.40 to $.50 per share to our results in 2012.

While we carefully watch for signs of an economic slowdown in China and are concerned about the ongoing weakness of domestic construction, we believe our China businesses will grow approximately twice as fast as China’s GDP rate. We could see a decline in North American commercial volumes as a result of the pre-buy in the fourth quarter 2011 related to the Southern California air quality standard change, but we believe the balance of North American water heater volumes will be flat in 2012 because of the replacement business. We expect our Lochinvar business will grow in excess of ten percent in 2012 compared with full year 2011, as the boiler industry continues to transition from lower efficiency to higher efficiency boilers. We expect improved operating performance from our India water heater and China water treatment businesses in 2012 compared with 2011. However, we estimate significantly higher pension expense in 2012 partially due to a lower discount rate and lower expected investment returns. All this considered, we estimate 2012 earnings will be in a range of $2.65 and $2.85 per diluted share. This range does not include the potential impact from any future acquisitions or the impact of our RBC share activity.

OTHER MATTERS

Environmental

Our operations are governed by a number of federal, foreign, state, local and environmental laws concerning the generation and management of hazardous materials, the discharge of pollutants into the environment and remediation of sites owned by the company or third parties. We have expended financial and managerial resources complying with such laws. Expenditures related to environmental matters were not material in 2011 and are not expected to be material in any single year. We have accrued amounts associated with environmental obligations at various facilities and we believe these reserves are sufficient to cover reasonably anticipated remediation costs. Although we believe that our operations are substantially in compliance with such laws and maintain procedures designed to maintain compliance, there are no assurances that substantial additional costs for compliance will not be incurred in the future. However, since the same laws govern our competitors, we should not be placed at a competitive disadvantage.

Market Risk

We are exposed to various types of market risks, primarily currency. We monitor our risks in such areas on a continuous basis and generally enter into forward contracts to minimize such exposures for periods of less than one year. We do not engage in speculation in our derivatives strategies. Further discussion regarding derivative instruments is contained in Note 1 of Notes to Consolidated Financial Statements.

We enter into foreign currency forward contracts to minimize the effect of fluctuating foreign currencies. At December 31, 2011, we had net foreign currency contracts outstanding of $70.4 million. Assuming a hypothetical ten percent movement in the respective currencies, the potential foreign exchange gain or loss associated with the change in rates would amount to $7.0 million. It is important to note that gains and losses from our forward contract activities will be offset by gains and losses in the underlying transactions being hedged.

Our earnings exposure related to movements in interest rates is primarily derived from outstanding floating-rate debt instruments that are determined by short-term money market rates. At December 31, 2011, we had $363.9 million in outstanding floating-rate debt with a weighted-average interest rate of 1.9 percent at year end. A hypothetical ten percent annual increase or decrease in the year-end average cost of our outstanding floating-rate debt would result in a change in annual pretax interest expense of approximately $0.7 million.

Smith Investment Company Transaction

On December 9, 2008, we entered into a merger agreement with our largest stockholder, SICO, providing for SICO to become a wholly-owned subsidiary of our company in a tax free exchange. As a result of the merger, the stockholders of SICO now own shares of our company directly, rather than through SICO. Pursuant to the merger agreement, stockholders of SICO received 2.396 shares of our Class A Common Stock and 0.463 shares of our Common Stock for each share of SICO they held, subject to a portion of the Common Stock being placed in escrow to satisfy indemnity claims that we may have under the

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merger agreement. Prior to the merger, SICO owned approximately 97.9 percent of our outstanding Class A Common Stock and approximately 7.1% of our outstanding Common Stock. The merger agreement was approved by our stockholders on April 14, 2009 and was consummated on April 22, 2009.

The transaction with SICO was accounted for as a reverse acquisition with SICO as the accounting acquirer and our company (which is the surviving entity for legal purposes) as the accounting acquiree. As this is a common control transaction under Accounting Standards Codification (ASC) 805 Business Combinations, the transaction is accounted for as an equity transaction under ASC 810-10 Consolidations. The acquisition of a non-controlling interest does not require purchase accounting.

Furthermore, because SICO is the continuing reporting entity for accounting purposes, the reports filed by us as the surviving corporation in the transaction will parallel the financial reporting required under U.S. GAAP and Securities and Exchange Commission reporting rules as if SICO were the legal successor as of the date of the transaction. Accordingly, prior period financial information presented in our financial statements reflects the historical activity of SICO.

On January 19, 2009, SICO distributed all of its assets and liabilities other than its ownership of our stock. These assets and liabilities related primarily to the multicolor printing business conducted through Berlin Industries, Inc. and the commercial warehousing, trucking and packaging business conducted through Central States Distribution Service, Inc. For periods prior to this distribution, the results of operations, net assets and cash flows for these businesses have been classified as discontinued operations in the accompanying financial statements.

Forward-Looking Statements

This filing contains statements that the company believes are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements generally can be identified by the use of words such as “may,” “will,” “expect,” “intend,” “estimate,” “anticipate,” “believe,” “forecast,” “guidance” or words of similar meaning. These forward-looking statements are subject to risks and uncertainties that could cause actual results to differ materially from those anticipated as of the date of this filing. Important factors that could cause actual results to differ materially from these expectations include, among other things, the following: difficulties in integrating the Lochinvar acquisition or achieving the disclosed accretion, cost synergies and/or global expansion opportunities related to the acquisition; weakening in the high efficiency boiler market or slowdown in the transition from non-condensing to condensing boilers; the ability to execute our acquisition strategy; significant volatility in raw material prices; competitive pressures on the company’s businesses; inability to implement pricing actions; instability in the company’s water products markets; further weakening in housing construction; further weakening in commercial construction; timing of any recoveries in housing or commercial construction; a slowdown in the Chinese economy; inability to make SWT profitable and adverse general economic conditions and capital market deterioration. Forward-looking statements included in this filing are made only as of the date of this filing, and the company is under no obligation to update these statements to reflect subsequent events or circumstances. All subsequent written and oral forward-looking statements attributed to the company, or persons acting on its behalf, are qualified entirely by these cautionary statements.

ITEM 7A - QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

See “Market Risk” above.

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ITEM 8 - FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The Board of Directors and Stockholders

A. O. Smith Corporation

We have audited the accompanying consolidated balance sheets of A. O. Smith Corporation as of December 31, 2011 and 2010, and the related consolidated statements of earnings, comprehensive earnings, stockholders’ equity and cash flows for each of the three years in the period ended December 31, 2011. Our audits also included the financial statement schedule listed in the index at Item 15(a). These financial statements and schedule are the responsibility of the company’s management. Our responsibility is to express an opinion on these financial statements and schedule based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of A. O. Smith Corporation at December 31, 2011 and 2010, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2011, in conformity with U.S. generally accepted accounting principles. Also, in our opinion, the related financial statement schedule, when considered in relation to the basic financial statements taken as a whole, presents fairly in all material respects the information set forth therein.

As discussed in Note 1 of the consolidated financial statements, effective January 1, 2009, the Company changed its method of accounting for noncontrolling interests to conform with Accounting Codification Statement sub-topic 810-10-65, “Consolidations”, (formerly Statement of Financial Accounting Standards No. 160 Noncontrolling Interests in Consolidated Financial Statements, an amendment of ARB No. 51”).

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), A. O. Smith Corporation’s internal control over financial reporting as of December 31, 2011, based on criteria established in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 27, 2012 expressed an unqualified opinion thereon.

Ernst & Young LLP

Milwaukee, Wisconsin

February 27, 2012

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CONSOLIDATED BALANCE SHEETS

December 31 (dollars in millions)

		2011			2010
Assets
Current Assets
Cash and cash equivalents	$	463.4		$	118.9
Receivables		368.4			313.3
Inventories		168.4			146.8
Deferred income taxes		24.6			27.3
Investments		162.4			-
Other current assets		21.5			17.4
Current assets - discontinued EPC operations		-			272.3
Total Current Assets		1,208.7			896.0
Net property, plant and equipment		315.3			258.4
Goodwill		433.8			323.8
Other intangibles		352.7			106.6
Other assets		38.5			36.8
Deferred income taxes		-			89.7
Long-term assets - discontinued EPC operations		-			399.3
Total Assets	$	2,349.0		$	2,110.6
Liabilities
Current Liabilities
Trade payables	$	302.5		$	263.0
Accrued payroll and benefits		41.9			37.2
Accrued liabilities		77.2			53.3
Product warranties		43.7			36.4
Income taxes		4.5			5.7
Long-term debt due within one year		18.6			18.6
Current liabilities - discontinued EPC operations		31.5			122.6
Total Current Liabilities		519.9			536.8
Long-term debt		443.0			242.4
Deferred income taxes		3.1			-
Product warranties		88.1			75.8
Post-retirement benefit obligation		11.6			13.6
Pension liabilities		139.5			222.9
Other liabilities		49.3			59.2
Long-term liabilities - discontinued EPC operations		8.7			78.5
Total Liabilities		1,263.2			1,229.2
Commitments and contingencies		-			-
Stockholders’ Equity
Preferred Stock		-			-
Class A Common Stock (shares issued 7,250,791 and 7,481,748)		36.3			37.4
Common Stock (shares issued 40,426,119 and 40,195,162)		40.4			40.2
Capital in excess of par value		652.5			655.7
Retained earnings		729.9			452.1
Accumulated other comprehensive loss		(300.9	)		(229.4	)
Treasury stock at cost		(72.4	)		(74.6	)
Total Stockholders’ Equity		1,085.8			881.4
Total Liabilities and Stockholders’ Equity	$	2,349.0		$	2,110.6

See accompanying notes which are an integral part of these statements.

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CONSOLIDATED STATEMENT OF EARNINGS

Years ended December 31 (dollars in millions, except per share amounts)

		2011			2010			2009
Continuing Operations
Net sales	$	1,710.5		$	1,489.3		$	1,375.0
Cost of products sold		1,197.9			1,043.3			980.1
Gross profit		512.6			446.0			394.9
Selling, general and administrative expenses		372.8			328.7			291.8
Flood related expense		-			35.4			-
Restructuring, impairment and settlement (income) expense - net		(11.2	)		0.1			1.3
Interest expense		9.3			6.9			7.2
Other (income) expense - net		(19.8	)		0.5			2.8
Earnings before provision for income taxes		161.5			74.4			91.8
Provision for income taxes		50.3			17.3			30.9
Earnings before equity loss in joint venture and discontinued operations		111.2			57.1			60.9
Equity loss in joint venture		-			-			(0.4	)
Earnings from Continuing Operations		111.2			57.1			60.5
Discontinued Operations
Earnings from discontinued operations, less tax provision (benefit) for income taxes of $15.5 in 2011, $16.2 in 2010 and $(1.3) in 2009		43.0			54.4			29.1
Gain on sale of discontinued EPC operations, less tax provision of $145.6		151.5			-			-
Net Earnings		305.7			111.5			89.6
Net loss (earnings) attributable to noncontrolling interest:
Continuing operations		-			0.2			(9.6	)
Discontinued operations		-			-			1.3
Net earnings attributable to A. O. Smith Corporation	$	305.7		$	111.7		$	81.3
Net Earnings Per Share of Common Stock
Continuing Operations	$	2.41		$	1.25		$	1.48
Discontinued Operations		4.22			1.19			0.89
Net Earnings attributable to A. O. Smith Corporation	$	6.63		$	2.44		$	2.37
Diluted Net Earnings Per Share of Common Stock
Continuing Operations	$	2.39		$	1.24		$	1.48
Discontinued Operations		4.18			1.18			0.88
Net Earnings attributable to A. O. Smith Corporation	$	6.57		$	2.42		$	2.36
CONSOLIDATED STATEMENT OF COMPREHENSIVE EARNINGS (LOSS)
Years ended December 31 (dollars in millions)
	2011			2010			2009
Net Earnings	$	305.7		$	111.5		$	89.6
Other comprehensive (loss) earnings
Foreign currency translation adjustments		(7.2	)		7.3			2.9
Unrealized net (loss) gain on cash flow derivative     instruments, less related income tax benefit (provision) of     $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009		(11.0	)		(0.2	)		54.7
Change in pension liability     less related income tax benefit of     $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009		(54.5	)		(5.6	)		(6.7	)
Unrealized gain on investments less related tax provision of $0.7 in 2011		1.2			-			-
Less comprehensive earnings attributable to noncontrolling interest		-			-			(20.6	)
Reclass of accumulated comprehensive loss associated with noncontrolling interest		-			-			(179.7	)
Comprehensive Earnings (Loss)	$	234.2		$	113.0		$	(59.8	)

See accompanying notes which are an integral part of these statements.

28

CONSOLIDATED STATEMENT OF CASH FLOWS

Years ended December 31 (dollars in millions)

		2011			2010			2009
Operating Activities
Net Earnings	$	305.7		$	111.5		$	89.6
Less earnings from discontinued operations		(194.5	)		(54.4	)		(29.1	)
Adjustments to reconcile earnings from continuing operations to cash provided by operating activities:
Depreciation and amortization		47.0			40.8			38.3
Loss on disposal of assets		1.0			11.7			0.9
Unrealized gain on investment		(19.8	)		-			-
Net changes in operating assets and liabilities, net of acquisitions:
Current assets and liabilities		8.0			(37.5	)		46.8
Noncurrent assets and liabilities		(86.4	)		(8.8	)		(24.3	)
Other		-			-			0.7
Cash Provided by Operating Activities – continuing operations		61.0			63.3			122.9
Cash (Used in) Provided by Operating Activities – discontinued operations		(2.3	)		61.5			140.0
Cash Provided by Operating Activities		58.7			124.8			262.9
Investing Activities
Acquisition of businesses		(421.1	)		(11.8	)		(71.4	)
Proceeds from sale of investments		-			4.6			8.9
Proceeds on sale of assets		-			3.0			2.0
Net cash distributed with spinoff of discontinued SICO businesses		-			-			(7.1	)
Capital expenditures		(53.5	)		(53.5	)		(42.7	)
Cash Used in Investing Activities – continuing operations		(474.6	)		(57.7	)		(110.3	)
Cash Provided by (Used in) Investing Activities – discontinued operations		600.2			(8.8	)		(6.7	)
Cash Provided by (Used in) Investing Activities		125.6			(66.5	)		(117.0	)
Financing Activities
Long-term debt incurred		200.2			5.0			-
Long-term debt repaid		-			-			(91.1	)
Common stock repurchase		(23.5	)		-			-
Net proceeds from stock option activity		11.2			4.0			7.6
Dividends paid		(27.7	)		(24.7	)		(21.4	)
Cash Provided by (Used in) Financing Activities – continuing operations		160.2			(15.7	)		(104.9	)
Cash Used in Financing Activities – discontinued operations		-			-			-
Cash Provided by (Used in) Financing Activities		160.2			(15.7	)		(104.9	)
Net increase in cash and cash equivalents		344.5			42.6			41.0
Cash and cash equivalents-beginning of year		118.9			76.3			35.3
Cash and Cash Equivalents-End of Year	$	463.4		$	118.9		$	76.3

See accompanying notes which are an integral part of these statements.

29

CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY

Years ended December 31 (dollars in millions)

		2011			2010			2009
Class A Common Stock
Balance at the beginning of the year	$	37.4		$	39.3		$	60.4
Reverse acquisition of SICO		-			-			0.8
Conversion of Class A Common Stock		(1.1	)		(1.9	)		(21.9	)
Balance at the end of the year	$	36.3		$	37.4		$	39.3
Common Stock
Balance at the beginning of the year	$	40.2		$	39.9		$	2.3
Reverse acquisition of SICO		-			-			33.3
Conversion of Class A Common Stock		0.2			0.3			4.3
Balance at the end of the year	$	40.4		$	40.2		$	39.9
Capital in Excess of Par Value
Balance at the beginning of the year	$	655.7		$	636.9		$	(62.4	)
Buy out of Tianlong		-			12.9			-
Reverse acquisition of SICO		-			-			676.1
Conversion of Class A Common Stock		0.9			1.6			17.6
Issuance of share units		(3.7	)		(3.1	)		(0.1	)
Vesting of share units		(8.2	)		(1.6	)		-
Stock based compensation expense		6.7			6.1			3.5
Exercise of stock options		(7.5	)		(1.2	)		(0.9	)
Tax benefit from exercise of stock options and vesting of share units		4.3			0.7			2.9
Stock incentives and directors’ compensation		4.3			3.4			0.2
Balance at the end of the year	$	652.5		$	655.7		$	636.9
Retained Earnings
Balance at the beginning of the year	$	452.1		$	365.4		$	316.1
Net earnings		305.7			111.7			81.3
Activity related to the spin off of SICO discontinued businesses		-			-			(32.8	)
Cash dividends on stock		(27.9	)		(25.0	)		(11.8	)
Reverse acquisition of SICO		-			-			12.6
Balance at the end of the year	$	729.9		$	452.1		$	365.4
Accumulated Other Comprehensive Loss
Balance at the beginning of the year	$	(229.4	)	$	(230.9	)	$	(89.8	)
Foreign currency translation adjustments		(7.2	)		7.3			2.9
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009		(11.0	)		(0.2	)		54.7
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009		(54.5	)		(5.6	)		(6.7	)
Unrealized gain on investments less income tax provision of $0.7 in 2011		1.2			-			-
Less noncontrolling interest in other comprehensive gain		-			-			(12.3	)
Reverse acquisition of SICO		-			-			(179.7	)
Balance at the end of the year	$	(300.9	)	$	(229.4	)	$	(230.9	)
Treasury Stock
Balance at the beginning of the year	$	(74.6	)	$	(79.9	)	$	-
Reverse acquisition of SICO		-			-			(84.3	)
Exercise of stock options, net of 258,238 shares surrendered as proceeds in 2009		15.3			4.6			4.4
Stock incentives and directors’ compensation		0.4			0.3			-
Shares repurchased		(23.5	)		-			-
Vesting of share units, net of 27,561 shares surrendered to pay taxes in 2010		10.0			0.4			-
Balance at the end of the year	$	(72.4	)	$	(74.6	)	$	(79.9	)
Noncontrolling Interest
Balance at the beginning of the year	$	-		$	19.1		$	436.6
Net earnings		-			-			8.3
Cash dividends on stock		-			-			(7.8	)
Comprehensive gain		-			-			12.3
Reverse acquisition of SICO		-			-			(449.4	)
Acquisition of Tianlong		-			-			19.2
Net earnings of Tianlong		-			(0.2	)		(0.1	)
Buy out of Tianlong		-			(18.9	)		-
Balance at the end of the year	$	-		$	-		$	19.1
Total Stockholders’ Equity	$	1,085.8		$	881.4		$	789.8

30

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.    Organization and Significant Accounting Policies

Organization.  A. O. Smith Corporation (A. O. Smith or the company) is a manufacturer of water heaters and boilers, serving a diverse mix of residential and commercial end markets principally in the United States with a strong and growing international presence. The company is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless, oil and electric water heaters and commercial water heating equipment. Both segments primarily serve their respective regions of the world. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing and non-condensing boilers and water system tanks. The Rest of World segment also manufactures and markets water treatment products, primarily in Asia.

On August 22, 2011, the company sold its Electrical Products (EPC) business to Regal Beloit Corporation (RBC) for approximately $760 million in cash and approximately 2.83 million shares of RBC common stock. Due to the sale, EPC has been reported separately as a discontinued operation.

Consolidation. The consolidated financial statements include the accounts of the company and its wholly owned subsidiaries after elimination of intercompany transactions.

On April 22, 2009, A. O. Smith Corporation (the company) closed on a merger transaction with Smith Investment Company (SICO). The merger was approved by A. O. Smith’s stockholders on April 14, 2009.

The transaction between the company and SICO has been accounted for as a reverse acquisition with SICO as the accounting acquirer and the company (which is the surviving entity for legal purposes) as the accounting acquiree. As this is a common control transaction under Accounting Standards Codification (ASC) 805 Business Combinations (formerly Statement of Financial Accounting Standard (SFAS) 141(R)), the transaction is accounted for as an equity transaction under ASC 810-10 Consolidations (formerly SFAS 160). The acquisition of a noncontrolling interest does not require purchase accounting.

Furthermore, because SICO is the continuing reporting entity for accounting purposes, the reports filed by the company as the surviving corporation in the transaction will parallel the financial reporting required under Generally Accepted Accounting Principles (GAAP) and Securities and Exchange Commission (SEC) reporting rules as if SICO were the legal successor as of the date of the transaction. Accordingly, prior period financial information presented in the company’s financial statements reflects the historical activity of SICO.

On January 19, 2009, SICO distributed all of its assets and liabilities other than its ownership of A. O. Smith stock. These assets and liabilities related primarily to the multicolor printing business conducted through Berlin Industries, Inc. and the commercial warehousing, trucking and packaging business conducted through Central States Distribution Service, Inc.

Except when otherwise indicated, amounts reflected in the financial statements or the notes thereto relate to the company’s continuing operations.

Use of estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the accompanying financial statements and notes. Actual results could differ from those estimates.

Fair value of financial instruments. The carrying amounts of cash and cash equivalents, receivables, floating rate debt and trade payables approximated fair value as of December 31, 2011 and 2010, due to the short maturities or frequent rate resets of these instruments. The fair value of term notes with insurance companies was approximately $106.7 million as of December 31, 2011 compared with the carrying amount of $97.7 million for the same date. The fair value is estimated based on current rates offered for debt with similar maturities.

Foreign currency translation. For all subsidiaries outside the U.S., with the exception of its Mexican operation and two of its Chinese non-operating companies, the company uses the local currency as the functional currency. For those operations using a functional currency other than the U.S. dollar, assets and liabilities are translated into U.S. dollars at year-end exchange rates, and revenues and expenses are translated at weighted-average exchange rates. The resulting translation

31

1.    Organization and Significant Accounting Policies (continued)

adjustments are recorded as a separate component of stockholders’ equity. The Mexican operation and the two Chinese non-operating companies use the U.S. dollar as the functional currency as such operations are a direct and integral component of the company’s U.S. operations. Gains and losses from foreign currency transactions are included in net earnings.

Cash and cash equivalents. The company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.

Inventory valuation. Inventories are carried at lower of cost or market. Cost is determined on the last-in, first-out (LIFO) method for substantially all domestic inventories, which comprise 65 percent and 60 percent of the company’s total inventory at December 31, 2011 and 2010, respectively. Inventories of foreign subsidiaries and supplies are determined using the first-in, first-out (FIFO) method.

Property, plant and equipment. Property, plant and equipment are stated at cost. Depreciation is computed primarily by the straight-line method. The estimated service lives used to compute depreciation are generally 25 to 50 years for buildings, three to 20 years for equipment and three to seven years for software. Maintenance and repair costs are expensed as incurred.

Goodwill and other intangibles. Goodwill and indefinite-lived intangible assets are not amortized but are reviewed for impairment on an annual basis. Separable intangible assets primarily comprised of customer relationships that are not deemed to have an indefinite life are amortized on a straight-line basis over their estimated useful lives which range from ten to 25 years.

Impairment of long-lived and amortizable intangible assets. Property, plant and equipment and intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If the sum of the expected undiscounted cash flows is less than the carrying value of the related asset or group of assets, a loss is recognized for the difference between the fair value and carrying value of the asset or group of assets. Such analyses necessarily involve significant judgment.

Derivative instruments. ASC 815 Derivatives and Hedging (formerly SFAS 133), as amended, requires that all derivative instruments be recorded on the balance sheet at fair value and establishes criteria for designation and effectiveness of the hedging relationships. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as a part of a hedging relationship and further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, the company must designate the hedging instrument, based upon the exposure hedged, as a fair value hedge, cash flow hedge, or a hedge of a net investment in a foreign operation.

The company designates that all of its hedging instruments, except for its equity collar contract relating to RBC shares, are cash flow hedges. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income (OCI), net of tax, and is reclassified into earnings in the same line item associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. The amount by which the cumulative change in the value of the hedge more than offsets the cumulative change in the value of the hedged item (i.e., the ineffective portion) is recorded in earnings, net of tax, in the period the ineffectiveness occurs.

The company utilizes certain derivative instruments to enhance its ability to manage currency and interest rate exposures as well as raw materials price risk and equity investment volatility. Derivative instruments are entered into for periods consistent with the related underlying exposures and do not constitute positions independent of those exposures. The company does not enter into contracts for speculative purposes. The contracts are executed with major financial institutions with no credit loss anticipated for failure of the counterparties to perform.

32

1.    Organization and Significant Accounting Policies (continued)

Commodity Futures Contracts

In addition to entering into supply arrangements in the normal course of business, the company, primarily for its discontinued operation, also enters into futures contracts to fix the cost of certain raw material purchases, principally copper and aluminum, with the objective of minimizing changes in cost due to market price fluctuations. The hedging strategy for achieving this objective is to purchase commodities futures contracts on the open market of the London Metals Exchange (LME) or over the counter contracts based on the LME.

With one of its brokers, the company is required to make cash deposits on unrealized losses on commodity derivative contracts that exceed $10.0 million.

The after-tax loss of the effective portion of the contracts of $0.1 million as of December 31, 2011 was recorded in accumulated other comprehensive loss, and will be reclassified into cost of products sold in the period in which the underlying transaction is recorded in earnings. The effective portion of the contracts will be reclassified within one year. Contracts related to the company’s discontinued operation that expire after the expected closing date no longer qualified for hedge accounting; therefore the change in valuation from the announcement of the sale to August 22, 2011 was minimal and was recorded in earnings from discontinued operations in the years ended December 31, 2011 and 2010, respectively. Commodity hedges outstanding at December 31, 2011 are a total of approximately 0.3 million pounds of copper.

Foreign Currency Forward Contracts

The company is exposed to foreign currency exchange risk as a result of transactions in currencies other than the functional currency of certain subsidiaries. The company utilizes foreign currency forward purchase and sale contracts to manage the volatility associated with foreign currency purchases, sales and certain intercompany transactions in the normal course of business. Principal currencies include the Canadian dollar, Mexican peso and Euro.

Gains and losses on these instruments are recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction is recorded in earnings. When the hedged item is realized, gains or losses are reclassified from accumulated other comprehensive loss to the statement of earnings. The assessment of effectiveness for forward contracts is based on changes in the forward rates. These hedges have been determined to be effective.

The majority of the amounts in accumulated other comprehensive loss for cash flow hedges is expected to be reclassified into earnings within one year and all of the hedges will be reclassified into earnings no later than December 2013. Contracts related to the company’s discontinued operation that expire after the expected closing date no longer qualified for hedge accounting; therefore the change in valuation from the announcement of the sale to August 22, 2011 of $3.2 million and $0.4 million were recorded in earnings from discontinued operations in the years ended December 31, 2011 and 2010, respectively.

The following table summarizes, by currency, the contractual amounts of the company’s foreign currency forward contracts:

December 31 (dollars in millions)	2011				2010
	Buy		Sell		Buy		Sell
Euro	$	16.1	$	1.2	$	-	$	2.2
Canadian dollar		-		36.6		-		35.4
Mexican peso		16.5		-		11.2		-
Total	$	32.6	$	37.8	$	11.2	$	37.6

Interest Rate Swap Agreement

The company is exposed to interest rate risk as a result of its floating rate borrowings under its revolving credit facility. The company used an interest rate swap to manage this risk. The company’s one interest rate swap in the amount of $25 million expired in November 2010.

The interest rate swap was designated and accounted for as a cash flow hedge of floating rate debt. A derivative interest rate liability of $1.0 million as of December 31, 2009 was recorded in accrued liabilities. Gains and losses on this instrument were recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction was recorded in earnings. When

33

1.    Organization and Significant Accounting Policies (continued)

the hedged item was realized, gains or losses were reclassified from accumulated other comprehensive loss to the statement of earnings. The assessment of effectiveness for the interest rate swap was based on changes in floating rate interest rates. This swap was determined to be highly effective.

Equity Collar Contract

As discussed in Note 2, on August 22, 2011, the company sold EPC to RBC and received approximately 2.83 million RBC shares. The RBC share price appreciated in the first quarter of 2011 during which the company entered into an equity collar contract for 50 percent of the RBC shares to protect a portion of that appreciation. The put strike price of the equity collar is $63.29 and the call strike price of the collar is $77.32. The RBC share price on December 31, 2011 was $50.97. The collar does not qualify for hedge accounting and therefore is adjusted to fair value on a quarterly basis through earnings from continuing operations. The company is required to make cash or stock deposits on unrealized losses on the equity collar that exceed $25.0 million. The mark to market accounting for the RBC shares and hedge will continue until the equity collar contract expires in March 2012.

The impact of derivative contracts on the company’s financial statements is as follows (dollars in millions):

Fair value of derivative instruments designated as hedging instruments under ASC 815 in continuing operations:

December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011			2010
Commodities contracts	Other current assets	$	-		$	0.8
	Accrued liabilities		(0.1	)		-
Foreign currency contracts	Accrued liabilities		(1.6	)		(0.5	)
	Other current assets		1.3			1.1
Total derivatives designating as hedging instruments		$	(0.4	)	$	1.4

Fair value of derivatives not designated as hedging instruments under ASC 815 in continuing operations:

December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011		2010
Equity collar contract	Investments	$	17.9	$	-
Total derivatives not designated as hedging instruments		$	17.9	$	-

34

1.    Organization and Significant Accounting Policies (continued)

The effect of derivative instruments on the Statement of Earnings for continuing and discontinued operations.

Year ended December 31, (dollars in millions)

Derivatives in ASC 815 cash flow hedging relationships	Amount of (loss) gain recognized in OCI on derivative (effective  portion)						Location of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	Amount of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)						Location of gain recognized in earnings on derivative (ineffective portion)	Amount of gain recognized in earnings on a derivative (ineffective portion)
	2011			2010				2011			2010				2011		2010
Commodities contracts	$	(3.0	)	$	10.2		Cost of products sold	$	(0.1	)	$	1.1		Cost of products sold	$	-	$	-
							Discontinued operations		7.0			12.4		Discontinued operations		0.1		-
							Gain on sale of EPC		1.8			-		N/A		-		-
Foreign currency contracts		3.5			11.5		Cost of products sold		0.2			0.6		N/A		-		-
							Discontinued operations		6.9			9.0		Discontinued operations		-		-
							Gain on sale of EPC		5.2			-		NA		-		-
Interest rate swap contract		-			(0.1	)	Interest expense		-			(1.1	)	N/A		-		-
	$	0.5		$	21.6			$	21.0		$	22.0			$	0.1	$	-

Derivatives not designated as a hedging instrument under ASC 815	Location of gain recognized in earnings from continuing operations on derivative	Amount of gain recognized in earnings from continuing operations  on derivative
			2011		2010
Equity collar contract	Other income - net	$	17.9	$	-

35

1.    Organization and Significant Accounting Policies (continued)

Fair Value Measurements. The company adopted ASC 820 Fair Value Measurements and Disclosures (formerly SFAS 157) on January 1, 2008. ASC 820, among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring basis or nonrecurring basis. ASC 820 clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices in active markets; (Level 2) inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

Assets and liabilities measured at fair value are based on the market approach which are prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities.

Continuing assets measured at fair value on a recurring basis are as follows (dollars in millions):

Fair Value Measurement Using	December 31, 2011		December 31, 2010
Quoted Prices in Active Markets for Identical Assets (Level 1)	$	144.2	$	0.6
Significant Other Observable Inputs (Level 2)		17.8		0.8
Total Investments and Net Derivative Contracts	$	162.0	$	1.4

There were no changes in our valuation techniques used to measure fair values on a recurring basis as a result of adopting ASC 820.

Revenue recognition. The company recognizes revenue upon transfer of title, which occurs upon shipment of the product to the customer except for certain export sales where transfer of title occurs when the product reaches the customer destination.

Contracts and customer purchase orders are used to determine the existence of a sales arrangement. Shipping documents are used to verify shipment. The company assesses whether the selling price is fixed or determinable based upon the payment terms associated with the transaction and whether the sales price is subject to refund or adjustment. The company assesses collectability based on the creditworthiness of the customer as determined by credit checks and analysis, as well as the customer’s payment history, and does not require collateral on sales in most cases. The allowance for doubtful accounts was $3.4 million and $3.5 million at December 31, 2011 and 2010, respectively.

Accruals for customer returns for defective product are based on historical experience with similar types of sales. Accruals for rebates and incentives are based on pricing agreements and are tied to sales volume. Changes in such accruals may be required if future returns differ from historical experience or if actual sales volume differs from estimated sales volume. Rebates and incentives are recognized as a reduction of sales.

Shipping and handling costs billed to customers are included in net sales and the related costs are included in cost of products sold.

Advertising. The majority of advertising costs are charged to operations as incurred and amounted to $58.9 million, $47.9 million and $41.0 million during 2011, 2010 and 2009, respectively. Included in total advertising costs are expenses associated with store displays and shell water units for A. O. Smith branded products in China that are amortized over 12 to 24 months which totaled $13.1 million, $9.2 million and $5.7 million during 2011, 2010 and 2009, respectively.

Research and development. Research and development costs are charged to operations as incurred and amounted to $42.7 million, $37.1 million and $31.0 million during 2011, 2010 and 2009, respectively.

Product warranties. The company’s products carry warranties that generally range from one to ten years and are based on terms that are generally accepted in the market. The company records a liability for the expected cost of warranty-related claims at the time of sale. The allocation of our warranty liability between current and long-term is based on expected warranty claims to be paid in the next year as determined by historical product failure rates.

36

1.    Organization and Significant Accounting Policies (continued)

The following table presents the company’s product warranty liability activity in 2011 and 2010:

Years ended December 31 (dollars in millions)	2011			2010
Balance at beginning of year	$	112.2		$	108.6
Lochinvar acquisition (see Note 3)		5.8			-
Expense		64.6			62.7
Net increase in warranty reserve due to settlement		7.5			-
Claims settled		(58.3	)		(59.1	)
Balance at end of year	$	131.8		$	112.2

See Note 4 for discussion on the increase in warranty reserve due to settlement and the increase in warranty expense and reserve associated with component issues in Canada.

Environmental costs. The company accrues for costs associated with environmental obligations when such costs are probable and reasonably estimable. Costs of estimated future expenditures are not discounted to their present value. Recoveries of environmental costs from other parties are recorded as assets when their receipt is considered probable. The accruals are adjusted as facts and circumstances change.

Stock-based compensation. The company follows ASC 718, Compensation—Stock Compensation (formerly SFAS 123(R)). Compensation cost is recognized using the straight-line method over the vesting period of the award. ASC 718 also requires the benefits of tax deductions in excess of recognized compensation cost to be reported as a financing cash flow, rather than as an operating cash flow as required under prior literature. Excess tax deductions of $4.3 million, $0.7 million and $2.9 million were recognized as financing cash flows in 2011, 2010 and 2009, respectively.

Earnings per share of common stock. The company is not required to use the two-class method of calculating earnings per share since its Class A Common Stock and Common Stock have equal dividend rights. The numerator for the calculation of basic and diluted earnings per share is net earnings. The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations:

	2011		2010		2009
Denominator for basic earnings per share - weighted-average shares outstanding		46,119,032		45,743,246		34,289,257
Effect of dilutive stock options, restricted stock and share units		455,586		419,469		187,599
Denominator for diluted earnings per share		46,574,618		46,162,715		34,476,856

On October 11, 2010, the company’s board of directors declared a three-for-two stock split of the company’s Class A Common Stock and Common Stock in the form of a 50 percent stock dividend to stock holders of record on October 29, 2010 and payable on November 15, 2010. Shares held in treasury by the company were not impacted by the split. All references in the financial statements to number of shares outstanding, price per share, per share amounts and stock based compensation data have been retroactively restated to reflect the split for all periods presented.

The weighted average shares presented above have been impacted by the accounting treatment of the company’s transaction with SICO which closed on April 22, 2009 and is discussed in more detail earlier in Note 1 to the Notes to Consolidated Financial Statements. The primary accounting impact of the SICO transaction is in the calculation of earnings per share since the accounting rules require the use of SICO adjusted average shares outstanding rather than A. O. Smith Corporation average shares outstanding prior to the closing. The SICO average shares outstanding reflect the historical shares of SICO multiplied by their exchange ratio from the April 22, 2009 merger transaction. Subsequent to the closing, A. O. Smith Corporation average shares are used in the calculation.

Reclassifications. Certain amounts from prior years have been reclassified to conform with current year presentation.

37

1.    Organization and Significant Accounting Policies (continued)

Recent Accounting Pronouncements

In June 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2011-05, “Comprehensive Income (Topic 220): Presentation of Comprehensive Income.” ASU 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of shareholders’ equity. ASU 2011-05 will be effective for the quarter ending March 31, 2012. The adoption of this guidance will have no impact on the company’s financial condition or results of operations but will impact the presentation of the financial statements. The company is currently evaluating the presentation options.

In September 2011, the FASB issued ASU 2011-08, “Testing of Goodwill for Impairment (Topic 350)”. ASU 2011-08 allows companies to assess qualitative factors to determine whether the two-step quantitative goodwill impairment test needs to be performed. Under the option, an entity no longer would be required to calculate the fair value of a reporting unit unless it determines, based on that qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. The ASU may change how a company tests goodwill for impairment but should not change the timing or measurement of goodwill impairments. The ASU will be effective for the year ending December 31, 2012. The company is currently reviewing the standard for applicability.

2.    Discontinued Operations

On August 22, 2011, the company completed the sale of EPC to RBC for $759.9 million in cash and approximately 2.83 million of RBC shares. Included in the $759.9 million of cash is a final working capital adjustment of $7.4 million which is recorded as a receivable from RBC. The value of the RBC shares on the date of the closing of the sale was $140.6 million. See Note 13 for further discussion regarding the company’s investment in RBC stock. The company has paid $126.5 million in income taxes and $21.4 million in commissions and other sale related payments as of December 31, 2011 and estimates it will pay $34.2 million in income taxes in 2012.

Included in the gain on sale of EPC was an additional income tax accrual of $56.5 million due to the company’s assertion that certain foreign earnings derived from the sale of EPC were not considered permanently reinvested by the company. The accrual is included in long term deferred income taxes in continuing operations. Also included in the gain on sale is a $10.9 million gain related to cumulative translation adjustments associated with EPC’s foreign subsidiaries.

The results of EPC including all prior years have been reported separately as discontinued operations.

38

2.    Discontinued Operations (continued)

The components of the net assets of EPC discontinued operations were:

(dollars in millions)	December 31, 2010
Current Assets
Trade receivables	$	110.8
Inventory		135.9
Deferred taxes		2.2
Derivative contracts asset		17.4
Other current assets		6.0
Total Current Assets		272.3
Net property, plant and equipment		148.1
Goodwill		248.4
Other intangibles		2.8
Total Assets	$	671.6
Current Liabilities
Trade payables	$	89.5
Accrued payroll and benefits		15.2
Accrued liabilities		11.1
Product warranties		4.3
Income taxes		2.5
Total Current Liabilities		122.6
Deferred taxes		77.2
Other liabilities		1.3
Total Liabilities		201.1
Total Net Assets	$	470.5

Current liabilities-net of $31.5 million and long-term liabilities-net of $8.7 million of the EPC discontinued operations at December 31, 2011 consist primarily of certain retained product liabilities, employee obligations such as workers’ compensation and disability and income tax liabilities associated with EPC.

The condensed statement of earnings of the EPC discontinued operations is:

Years ended December 31 (dollars in millions)
	2011			2010			2009
Net sales	$	531.8		$	701.8		$	616.5
Cost of products sold		415.6			544.0			510.5
Gross profit		116.2			157.8			106.0
Selling, general and administrative expenses		61.5			84.2			74.8
Restructuring and other		-			0.1			(1.6	)
Interest expense		2.2			3.6			4.7
Other (income) expense—net		(6.0	)		(0.7	)		0.3
		58.5			70.6			27.8
Provision (benefit) for income taxes		15.5			16.2			(1.3	)
Net earnings	$	43.0		$	54.4		$	29.1

39

2.    Discontinued Operations (continued)

Consolidated interest expense not directly attributable to other operations was allocated to discontinued operations based on the ratio of EPC net assets to be sold to the sum of consolidated net assets plus consolidated debt not directly attributable to other operations.

The cash flow provided by EPC discontinued operations is as follows:

Years ended December 31 (dollars in millions)
	2011			2010			2009
Operating Activities
Earnings	$	43.0		$	54.4		$	29.1
Adjustments to reconcile earnings to net cash provided by discontinued operating activities:
Depreciation and amortization		16.5			26.1			29.2
Gain on sale of assets		(4.8	)		(0.2	)		(2.0	)
Net changes in operating assets and liabilities
Current assets and liabilities		(56.2	)		(23.3	)		74.5
Noncurrent assets and liabilities		0.9			4.5			9.9
Other		(1.7	)		-			(0.7	)
Cash (Used in) Provided by Discontinued Operating Activities		(2.3	)		61.5			140.0
Investing Activities
Capital expenditures		(10.5	)		(14.3	)		(14.3	)
Proceeds on sale of assets		6.1			5.5			7.6
Proceeds from sale of operations		752.5			-			-
Payments associated with sale		(147.9	)		-			-
Cash Provided by (Used in) Discontinued Investing Activities		600.2			(8.8	)		(6.7	)
Cash Flow Provided by Discontinued Operations	$	597.9		$	52.7		$	133.3

In the second quarter of 2011, the company sold a facility in China and recognized a gain of $4.8 million.

3.    Acquisitions

On August 26, 2011, the company acquired 100 percent of the shares of Lochinvar Corporation (Lochinvar), a privately held manufacturer of high-efficiency boilers used in residential and commercial hydronic heating and hot water applications located in Lebanon, Tennessee. The addition of Lochinvar expands the company’s product offerings and gives the company access to proven high-efficiency boiler technology. Lochinvar is included in the North America segment.

The company paid an aggregate cash purchase price, net of $1.5 million of cash acquired, of $421.1 million. In addition, the company incurred acquisition costs of approximately $5.5 million. Under the purchase agreement for the Lochinvar acquisition, the company agreed to make a contingent payment of up to an additional $35.0 million in cash based on the amount by which Lochinvar sales between December 1, 2011 and November 30, 2012 exceed $216.0 million. As of the acquisition date and December 31, 2011, the fair value of the contingent payment has been estimated at $16.8 million.

The following table summarizes the allocation of fair value of the assets acquired and liabilities assumed at the date of acquisition. Of the $258.3 million of acquired intangible assets, $103.5 million has been assigned to tradenames that are not subject to amortization and $152.5 million has been assigned to customer lists which are being amortized over 19 years, and the remaining $2.3 million has been assigned to non-compete agreements and patents which are being amortized over ten years.

40

3.    Acquisition (continued)

August 26, 2011 (dollars in millions)
Current assets, net of cash acquired	$	54.0
Property, plant and equipment		41.9
Intangible assets		258.3
Other assets		0.1
Goodwill		111.4
Total assets acquired		465.7
Current liabilities		24.3
Long-term liabilities		3.5
Total liabilities assumed		27.8
Net assets acquired	$	437.9

For income tax purposes, the transaction has been accounted for as an asset purchase, resulting in the full amount of goodwill and intangible assets, totaling $369.7 million being deductible for income tax purposes.

Lochinvar’s results of operations have been included in the company’s financial statements from August 26, 2011, the date of acquisition. Revenues and pretax earnings associated with Lochinvar included in operations totaled $75.9 million and $5.6 million, respectively which included $13.0 million of operating earnings less $5.5 million of acquisition costs included in selling, general and administrative expense and $1.9 million of interest expense.

The following table represents the pro forma unaudited results of operations for the company for the years ended December 31, 2011 and 2010, respectively, assuming consummation of the purchase of Lochinvar as of January 1, of each year. (dollars in millions except per share data):

	Years ended December 31,
	2011		2010
Net sales	$	1,835.8	$	1,664.0
Earnings from continuing operations		122.5		71.5
Earnings per common share:
Basic	$	2.66	$	1.56
Diluted	$	2.63	$	1.55

The pro forma results have been prepared for informational purposes only and include adjustments to depreciation expense of acquired plant and equipment, amortization of intangible assets other than goodwill and tradenames, increased interest expense on acquisition related debt, and certain other adjustments, together with related income tax effects of such adjustments. These pro forma results do not purport to be indicative of the results of operations that would have occurred had the purchases been made as of the beginning of the periods presented or of the results of operations that may occur in the future.

In November 2009, the company acquired a majority interest in the water treatment business of Tianlong Holding Co. Ltd. (Tianlong) of Hong Kong, with operations based in Shanghai, China. A newly formed company, A. O. Smith (Shanghai) Water Treatment Products Co., Ltd. (SWT), holds the assets of the business, which manufactures and supplies reverse osmosis units and other water treatment products to the China residential and commercial markets as well as export markets around the world.

The company acquired an 80 percent interest in SWT at a total cost of $76.7 million, including fixed future payments of $5.7 million, subject to reductions for claims the company may make if there are any breaches of the representations and warranties made by the selling shareholder under the acquisition agreement. As required under ASC 805 the company recorded 100% of the fair value of the assets and liabilities as of the date of acquisition, with the 20 percent noncontrolling interest recorded in the equity section of the company’s balance sheet. The acquisition value exceeded the fair value of the assets acquired by $90.6 million, of which $55.4 million was recorded as goodwill and $42.2 million was recorded as intangible assets in the Rest of World segment. In addition, $7.0 million of deferred tax liabilities associated with the intangible assets were recorded. In 2010, the company made a goodwill adjustment of $1.1 million related to an inventory valuation. The company purchased the remaining 20 percent interest in SWT for $6 million from its former partner in the fourth quarter of 2010 and the company now owns 100 percent of SWT. The difference between the amount paid and the carrying value of the noncontrolling interest was

41

3.    Acquisitions (continued)

recorded to additional paid-in capital. The $5.7 million future payment mentioned above was not paid due to breaches of representations and warranties and was recognized as a gain as part of a settlement with the former owner (see Note 4).

In July 2010, the company purchased the U.S. assets and the right to market and sell tankless water heaters in North America from Takagi Industrial Co, Ltd (Takagi) of Fuji-city, Shizuoka, Japan for $5.5 million. Through the venture, the company offers a full line of tankless water heaters under its own brands in association with the Takagi brand. Takagi is included in the North America segment.

In the fourth quarter of 2010, the company purchased the remaining 50 percent share of its China joint venture that manufactures combi-boilers for the residential market in China for $0.3 million. The joint venture was formed in December, 2007.

In April 2009, the company acquired the assets of Applied Energy Recovery Systems Inc. (AERS), a manufacturer of commercial and residential heat pump water heater products located in Norcross, Ga. The purchase price for the assets totaled $0.7 million, including a fixed payment of $0.1 million made in 2010 and contingent future payments totaling $0.2 million due during the period 2010 through 2013 based on achievement of sales projections. No contingent payments were made in 2011 or 2010. All future payments are subject to reductions for claims the company may make if there are any breaches of the representations and warranties made by the seller under the asset purchase agreement. The purchase price exceeded the fair value of the assets acquired by $0.5 million which was recorded as goodwill. AERS is included in the North America segment.

The acquisitions were accounted for under the purchase accounting method, and accordingly, the results of operations are included in the company’s financial statements from the date of acquisition.

4.    Restructuring, Impairment, Other Charges and Settlement Income

Restructuring, Impairment and Settlement Income, Net

On May 5, 2011, the company entered into an agreement settling a legal action that the company commenced on June 30, 2009, in Tennessee State Court, seeking recovery for costs and damages due to an issue with a component part supplied by the vendor. Under the terms of the settlement agreement, the vendor and the vendor’s supplier made a $35.5 million cash payment to the company. The settlement reimbursed the company for past costs previously incurred, satisfied in full a receivable recorded by the company, and the company increased its reserve for future costs associated with the affected components on company products by $7.5 million. In the second quarter of 2011, the company recorded a pretax gain of $11.2 million for the reimbursement of related costs incurred in prior years. This activity is included in the North America segment.

Also in the second quarter of 2011, the company recorded an $8.2 million warranty provision to reflect an estimate of expenses that it will likely incur in the future related to a similar component issue in Canada. On June 14, 2011, the company commenced legal action in the United States District Court for the Eastern District of Missouri against certain suppliers seeking recovery of increased costs and damages that the company incurred or will incur due to the issue in Canada. The company has not recorded any adjustments to its provision due to the early status of the legal action. These charges are included in the North America segment.

In 2010, the company recognized a $3.3 million impairment charge related to SWT’s trademarks. The company announced plans to move the water treatment operations to Nanjing, China to recognize synergies associated with the company’s strong management team and the engineering center in place at the company’s water heater operations in that city. A restructuring charge of $1.8 million was recognized relative to the move for severance, lease termination and asset impairment costs. The charges were largely offset by a $5.0 million gain on settlement of disputes with the prior owner relative to breaches of representations and warranties regarding the condition of SWT on the date of purchase. This activity is included in Rest of World segment.

The following table presents an analysis of the company’s restructuring, impairment and settlement reserve as of and for the years ended December 31, 2011 and 2010 (dollars in millions):

42

4.    Restructuring, Impairment, Other Charges and Settlement Income (continued)

	Severance Costs			Intangible Impairment			Settlement Income			Other			Total
Balance at December 31, 2009	$	-		$	-		$	-		$	-		$	-
Expense (income) recognized		1.1			3.3			(5.0	)		0.7			0.1
Intangible asset write-down		-			(3.3	)		-			(0.1	)		(3.4	)
Settlement income		-			-			5.0			-			5.0
Balance at December 31, 2010	$	1.1		$	-		$	-		$	0.6		$	1.7
Cash payments		(1.1	)		-			-			(0.6	)		(1.7	)
Income recognized		-			-			(11.2	)		-			(11.2	)
Settlement income		-			-			11.2			-			11.2
Balance at December 31, 2011	$	-		$	-		$	-		$	-		$	-

Other Charges – Tower Automotive, Inc.

The company was the primary lessee on a facility lease in Corydon, Indiana related to a business sold to Tower Automotive, Inc. (Tower) in 1997. The company entered into a sublease arrangement with Tower in 1997 with the same terms and conditions as the company’s lease. Tower filed for bankruptcy on February 2, 2005 and subsequently notified the company that it would reject the sublease arrangement effective October 1, 2005. In order to minimize costs, the company purchased the Corydon facility for $4.5 million on October 11, 2005. On March 26, 2009, the company sold the Corydon facility for $2.0 million which resulted in a $0.9 million loss that was recognized at the time of the sale.

Other Charges

The company recognized $0.4 million of expense in 2009, associated with retained liabilities of previously owned businesses which were sold by the company between 1997 and 2001. The majority of the $0.4 million recognized in 2009 is related to ongoing environmental liabilities.

5.    Statement of Cash Flows

Supplemental cash flow information is as follows:

Years ended December 31 (dollars in millions)	2011			2010			2009
Net change in current assets and liabilities, net of acquisitions:
Receivables	$	(28.1	)	$	(33.2	)	$	(10.5	)
Inventories		4.7			(32.0	)		17.0
Other current assets		(4.5	)		(1.5	)		(1.0	)
Trade payables		27.4			23.3			40.8
Accrued liabilities, including payroll and benefits		5.8			(0.7	)		6.4
Income taxes payable		2.7			6.6			(5.9	)
	$	8.0		$	(37.5	)	$	46.8

6.    Inventories

December 31 (dollars in millions)	2011		2010
Finished products	$	85.6	$	72.7
Work in process		10.6		14.4
Raw materials		98.9		82.7
Inventories, at FIFO cost		195.1		169.8
LIFO reserve		26.7		23.0
	$	168.4	$	146.8

43

6.    Inventories (continued)

The company recognized after-tax LIFO expense (income) of $0.4 million, $0.3 million and $(0.6) million in 2011, 2010 and 2009, respectively.

7.    Property, Plant and Equipment

December 31 (dollars in millions)	2011		2010
Land	$	11.7	$	9.2
Buildings		166.8		121.8
Equipment		418.7		377.9
Software		16.8		16.0
		614.0		524.9
Less accumulated depreciation and amortization		298.7		266.5
	$	315.3	$	258.4

8.    Goodwill and Other Intangible Assets

Changes in the carrying amount of goodwill during the years ended December 31, 2011 and 2010, consisted of the following:

(dollars in millions)	North America			Rest of World			Total
Balance at December 31, 2009	$	264.6		$	55.3		$	319.9
Acquisition of businesses (see Note 3)		-			1.1			1.1
Currency translation adjustment		2.8			-			2.8
Balance at December 31, 2010		267.4			56.4			323.8
Acquisition of businesses (see Note 3)		108.8			2.6			111.4
Currency translation adjustment		(1.3	)		(0.1	)		(1.4	)
Balance at December 31, 2011	$	374.9		$	58.9		$	433.8

The carrying amount of other intangible assets consisted of the following:

		$00.000000		$00.000000			$00.000000		$00.000000		$00.000000			$00.000000
	2011							2010
December 31 (dollars in millions)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Amortizable intangible assets
Patents	$	6.8	$	(3.6	)	$	3.2	$	6.6	$	(2.8	)	$	3.8
Customer lists		231.0		(27.4	)		203.6		78.6		(18.6	)		60.0
Total amortizable intangible assets		237.8		(31.0	)		206.8		85.1		(21.4	)		63.7
Indefinite-lived intangible assets
Trade names		145.9		-			145.9		42.9		-			42.9
Total intangible assets	$	383.7	$	(31.0	)	$	352.7	$	128.0	$	(21.4	)	$	106.6

Amortization of other intangible assets of $9.6 million, $7.1 million, and $3.9 million was recorded in 2011, 2010 and 2009, respectively. In the future, amortization should approximate $14.7 million annually and the intangible assets will be amortized over a weighted average period of 17 years.

As a result of the sale of EPC and change in management reporting, the company reconsidered its segment reporting in the fourth quarter of 2011. These changes did not have a significant impact on how the company evaluates goodwill or other intangible assets for impairment. The company concluded that no goodwill impairment existed at the time of the annual impairment tests which were performed in the fourth quarters of 2011, 2010 and 2009. In 2010, the company recognized an intangible asset impairment charge related to SWT of $3.3 million (see Note 4). No impairments of other intangible assets were recorded in 2011 and 2009.

44

9.    Debt and Lease Commitments

December 31 (dollars in millions)	2011		2010
Bank credit lines, average year-end interest rate of 6.8% for 2011 and 5.1% for 2010	$	6.2	$	6.5
Revolving credit agreement borrowings, average year-end interest rate of 1.8% for 2011 and 2010		330.0		115.0
Commercial paper, average year-end interest rate of 1.3% for 2011		27.7		-
Term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.9% for 2011 and 2010		68.3		86.9
Canadian revolving credit agreement borrowings, average year-end interest rate of 2.7% for 2010		-		22.6
Canadian term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.3% for 2011 and 2010		29.4		30.0
		461.6		261.0
Less long-term debt due within one year		18.6		18.6
Long-term debt	$	443.0	$	242.4

The company has a $425 million multi-year multi-currency revolving credit agreement with a group of eight banks, which expires on November 13, 2013. The facility has an accordion provision which allows it to be increased up to $525 million if certain conditions (including lender approval) are satisfied. Borrowings under the company’s bank credit lines and commercial paper borrowings are supported by the revolving credit agreement. As a result of the long-term nature of this facility, the commercial paper and credit line borrowings are classified as long-term debt at December 31, 2011 and 2010. At its option, the company maintains either cash balances or pays fees for bank credit and services.

Scheduled maturities of long-term debt within each of the five years subsequent to December 31, 2011 are as follows:

Years ending December 31 (dollars in millions)	Amount
2012	$	18.6
2013		382.5
2014		14.4
2015		14.4
2016		14.4

Future minimum payments under non-cancelable operating leases relating mostly to office, manufacturing and warehouse facilities total $50.5 million and are due as follows

Years ending December 31 (dollars in millions)	Amount
2012	$	12.4
2013		8.6
2014		7.5
2015		6.5
2016		4.6
Thereafter		10.9

Rent expense, including payments under operating leases, was $16.1 million, $13.9 million and $12.3 million in 2011, 2010 and 2009, respectively.

Interest paid by the company including discontinued operations was $11.5 million, $10.5 million and $11.9 million in 2011, 2010 and 2009, respectively.

45

10.    Stockholders’ Equity

The stockholders’ equity presented in the consolidated financial statements has been impacted by the accounting treatment of the company’s transaction with SICO which closed on April 22, 2009 and is discussed in more detail in Note 1 to the Notes to Consolidated Financial Statements. The primary impact on stockholders’ equity is that the accounting rules require the presentation of SICO’s stockholders’ equity prior to the transaction. Subsequent to the transaction, A. O. Smith Corporation stockholders’ equity activity is presented.

SICO’s authorized capital consisted of 10 million shares of Common Stock $.10 par value.

The company’s authorized capital consists of 3 million shares of Preferred Stock $1 par value, 14 million shares of Class A Common Stock $5 par value, and 60 million shares of Common Stock $1 par value. The Common Stock has equal dividend rights with Class A Common Stock and is entitled, as a class, to elect one-third of the Board of Directors and has 1/10th vote per share on all other matters. Class A Common Stock is convertible to Common Stock on a one for one basis.

During 2011, 2010 and 2009, there were 230,957, 364,520 and 4,365,845 shares, respectively, of Class A Common Stock converted into Common Stock. Regular dividends paid on the A. O. Smith Corporation Class A Common Stock and Common Stock amounted to $0.60, $0.54 and $0.51 per share in 2011, 2010 and 2009, respectively.

In December 2007, the company’s Board of Directors authorized, and ratified on December 14, 2010, the purchase of 1.5 million shares of its outstanding Common Stock. 611,589 shares were purchased in 2011 at a total cost of $23.5 million. No shares were purchased in 2010 and 2009.

At December 31, 2011, 32,595 and 1,817,815 shares of Class A Common Stock and Common Stock, respectively, were held as treasury stock. At December 31, 2010, 32,595 and 1,811,199 shares of Class A Common Stock and Common Stock, respectively, were held as treasury stock.

Accumulated other comprehensive loss is as follows:

December 31 (dollars in millions)	2011			2010
Cumulative foreign currency translation adjustments	$	16.5		$	23.7
Unrealized net (loss) gain on cash flow derivative instruments (net of income tax benefit (provision) of $0.1 in 2011 and $(6.9) in 2010)		(0.3	)		10.7
Pension liability (net of income tax of $204.1 in 2011 and $169.3 in 2010)		(318.3	)		(263.8	)
Unrealized net gain on investments less related income tax provision of $(0.7)		1.2			-
	$	(300.9	)	$	(229.4	)

11.    Stock Based Compensation

The company adopted the A. O. Smith Combined Incentive Compensation Plan (the “plan”) effective January 1, 2007. The plan is a continuation of the A. O. Smith Combined Executive Incentive Compensation Plan which was originally approved by shareholders in 2002. At the company’s annual meeting of stockholders on April 14, 2009, an amendment to the plan was approved to increase the authorized shares of Common Stock under the plan by 1,875,000. The number of shares available for granting of options or share units at December 31, 2011, was 1,918,931. Upon stock option exercise, restricted stock grant, or share unit vesting, shares are issued from Treasury stock.

Total stock based compensation cost from continuing operations recognized in 2011, 2010 and 2009 was $5.7 million, $5.4 million and $5.1 million, respectively.

Stock options

The stock options granted in 2011, 2010 and 2009 have a three year pro rata vesting from the date of grant. Stock options are issued at exercise prices equal to the fair value of Common Stock on the date of grant. For active employees, all options granted in 2011, 2010 and 2009 expire ten years after date of grant. Stock option compensation recognized in 2011, 2010 and 2009 was $2.8 million, $2.2 million and $2.2 million, respectively. Included in the stock option expense recognized in 2011, 2010 and 2009 is expense associated with the accelerated vesting of stock option awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period.

46

11.    Stock Based Compensation (continued)

Changes in option shares, all of which are Common Stock, were as follows:

	Weighted-Avg. Per Share		Years Ended December 31									(dollars in millions) Aggregate Intrinsic Value
	Exercise Price		2011			2010			2009
Outstanding at beginning of year		$22.17		1,623,101			1,630,751			1,933,601
Granted
2011—$43.12 to $44.12 per share				178,200
2010—$27.93 per share							237,000
2009—$16.40 to $21.66 per share										506,400
Exercised
2011—$15.99 to $27.93 per share				(364,081	)								$  7.7
2010—$9.04 to $25.84 per share							(240,801	)					3.3
2009—$9.04 to $19.47 per share										(809,250	)		8.1
Forfeited
2011—$19.00 to $43.12 per share				(15,353	)
2010—$19.00 to $27.93 per share							(3,849	)
Outstanding at end of year
(2011—$15.99 to $44.12 per share)		24.84		1,421,867			1,623,101			1,630,751
Exercisable at end of year		22.23		989,933			951,035			831,401

The aggregate intrinsic value for the outstanding and exercisable options as of December 31, 2011 is $20.0 million and $18.2 million, respectively. The average remaining contractual life for outstanding and exercisable options is eight years and seven years, respectively.

The following table summarizes weighted-average information by range of exercise prices for stock options outstanding and exercisable at December 31, 2011:

Range of     Exercise Prices	Options Outstanding at December 31, 2011	Weighted- Average Exercise Price	Options Exercisable at December 31, 2011	Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Life
$15.99 to $19.47	561,349	$  18.86	426,899	$    18.85	7 years
$21.34 to $24.02	298,401	23.18	294,851	23.20	7 years
$25.84 to $43.12	562,117	31.67	268,183	26.53	8 years
	1,421,867		989,933

The weighted-average fair value per option at the date of grant during 2011, 2010 and 2009, using the Black-Scholes option-pricing model, was $16.51, $10.19 and $5.47, respectively. Assumptions were as follows:

	2011		2010		2009
Expected life (years)		6.4		6.4		6.4
Risk-free interest rate		3.6%		3.6%		2.8%
Dividend yield		1.3%		1.9%		2.8%
Expected volatility		38.4%		38.7%		35.0%

The expected life is based on historical exercise behavior and the projected exercise of unexercised stock options. The risk free interest rate is based on the U.S. Treasury yield curve in effect on the date of grant for the respective expected life of the option. The expected dividend yield is based on the expected annual dividends divided by the grant date market value of our common stock. The expected volatility is based on the historical volatility of our common stock.

47

11.    Stock Based Compensation (continued)

Restricted stock and share units

Participants may also be awarded shares of restricted stock or share units under the plan. The company granted 75,625, 101,873 and 159,801 share units under the plan in 2011, 2010 and 2009, respectively. Compensation expense was recognized ratably over the vesting period.

The share units were valued at $3.3 million, $2.9 million and $3.0 million at the date of issuance in 2011, 2010 and 2009, respectively, and will be recognized as compensation expense ratably over the three-year vesting period. Compensation expense of $2.9 million, $3.2 million and $2.9 million was recognized in 2011, 2010 and 2009, respectively. Included in share based compensation is expense associated with the accelerated vesting of share unit awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period.

A summary of share unit activity under the plan is as follows:

	Number of Units			Weighted-Average Grant Date Value
Outstanding at January 1, 2011		473,438		$22.43
Granted		75,625		43.12
Vested		(233,702	)	22.72
Forfeited/cancelled		(28,807	)	25.28
Outstanding at December 31, 2011		286,554		$27.36

Total compensation expense for share units not yet recognized is $3.2 million at December 31, 2011. The weighted average period over which the expense is expected to be recognized is ten months.

12.    Pension and Other Post-retirement Benefits

The company provides retirement benefits for all United States employees including benefits for employees of previously owned businesses which were earned up to the date of sale. The company also has several foreign pension plans, none of which are material to the company’s financial position.

The company had a defined contribution profit sharing and retirement plan covering the majority of its salaried nonunion employees which provided for annual company contributions of 35 percent to 140 percent of qualifying contributions made by participating employees. This plan was terminated on December 31, 2009 and was replaced by a plan which matches 100 percent of the first one percent of contributions made by participating employees and matches 50 percent of the next five percent of employee contributions. The new plan became effective on January 1, 2010. The company also has defined contribution plans for certain hourly employees which provide for matching company contributions.

The company also has a defined benefit plan for salaried employees and its non-union hourly workforce. In the fourth quarter of 2009, the company announced employees hired after Jan. 1, 2010, will not participate in the defined benefit plan, and benefit accruals for current salaried and non-union hourly employees will stop at the end of 2014. This change resulted in a plan curtailment and reduced the plan’s liability by $12.3 million. No curtailment gain was recognized because the reduction in liability was offset by existing unrecognized losses. An additional company contribution will be made to the defined contribution plan in lieu of participation in a defined benefit plan. The company also has defined benefit and contribution plans for certain union hourly employees.

The company has unfunded defined-benefit post-retirement plans covering certain hourly and salaried employees that provide medical and life insurance benefits from retirement to age 65. Certain hourly employees retiring after January 1, 1996, are subject to a maximum annual benefit and salaried employees hired after December 31, 1993, are not eligible for post-retirement medical benefits.

48

12.    Pension and Other Post-retirement Benefits (continued)

Obligations and Funded Status

Pension and Post-Retirement Disclosure Information Under ASC 715

The following tables present the changes in benefit obligations, plan assets and funded status for domestic pension and post-retirement plans and the components of net periodic benefit costs.

	Pension Benefits						Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2011			2010
Accumulated Benefit Obligation (ABO) at December 31	$	895.1		$	850.3			N/A			N/A
Change in projected benefit obligations (PBO)
PBO at beginning of year	$	(862.1	)	$	(826.7	)	$	(14.9	)	$	(17.0	)
Service cost		(9.1	)		(8.6	)		(0.1	)		(0.2	)
Interest cost		(44.1	)		(46.7	)		(0.7	)		(0.8	)
Participant contributions		-			-			(0.3	)		(0.4	)
Plan amendments		(1.6	)		-			-			-
Actuarial (loss) gain including assumption changes		(52.0	)		(38.7	)		1.9			2.1
Benefits paid		60.4			58.6			1.4			1.4
Curtailment		2.0			-			-			-
PBO at end of year	$	(906.5	)	$	(862.1	)	$	(12.7	)	$	(14.9	)
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	640.8		$	594.0		$	-		$	-
Actual return on plan assets		11.3			74.8			-			-
Contribution by the company		176.9			30.6			1.1			1.0
Participant contributions		-			-			0.3			0.4
Benefits paid		(60.4	)		(58.6	)		(1.4	)		(1.4	)
Plan assets at end of year	$	768.6		$	640.8		$	-		$	-
Funded status	$	(137.9	)	$	(221.3	)	$	(12.7	)	$	(14.9	)
Amount recognized in the balance sheet
Current liabilities	$	-		$	-		$	(1.1	)	$	(1.3	)
Non-current liabilities		(137.9	)		(221.3	)		(11.6	)		(13.6	)
Net pension liability at end of year	$	(137.9	)*	$	(221.3	)*	$	(12.7	)	$	(14.9	)
Amounts recognized in Accumulated Other Comprehensive Loss Before Tax
Net actuarial loss (gain)	$	532.0		$	447.2		$	(2.8	)	$	(3.3	)
Prior service cost		(8.9	)		(12.7	)		-			-
Total recognized in accumulated other comprehensive loss	$	523.1		$	434.5		$	(2.8	)	$	(3.3	)

* In addition the company has recorded a liability for a foreign pension plan of $1.6 million and $1.6 million at December 31, 2011 and 2010, respectively and an accumulated other comprehensive loss of $2.1 million and $1.9 million at December 31, 2011 and 2010, respectively.

49

12.    Pension and Other Post-retirement Benefits (continued)

	Pension Benefits									Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
Net periodic benefit cost
Service cost	$	9.1		$	8.6		$	8.4		$	0.2		$	0.2		$	0.2
Interest cost		44.2			46.7			49.8			0.7			0.8			1.0
Expected return on plan assets		(70.6	)		(61.6	)		(60.8	)		-			-			-
Amortization of unrecognized:
Net actuarial loss		24.4			17.7			10.6			(0.4	)		(0.4	)		-
Prior service cost		(0.9	)		(0.9	)		0.3			-			-			-
Curtailment and other one-time charges		(1.3	)		-			-			(2.1	)		-			-
Defined-benefit plan cost		4.9			10.5			8.3		$	(1.6	)	$	0.6		$	1.2
Various U.S. defined contribution plans cost		5.6			5.8			6.5
	$	10.5	*	$	16.3	*	$	14.8	*
Other Changes in Plan Assets and Projected Benefit Obligation Recognized in Other Comprehensive Earnings
Net actuarial loss (gain)	$	109.3		$	25.4		$	34.8		$	0.2		$	(2.1	)	$	-
Amortization of net actuarial (loss) gain		(24.4	)		(17.7	)		(10.6	)		0.4			0.4			-
Prior service cost		2.8			-			(12.4	)								-
Amortization of prior service cost		0.9			0.9			(0.3	)		(0.1	)		(0.1	)		-
Total recognized in other comprehensive earnings		88.6			8.6			11.5			0.5			(1.8	)		-
Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings	$	93.5		$	19.1		$	19.8		$	(1.1	)	$	(1.2	)	$	1.2

The estimated net actuarial loss and prior service cost for the pension plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2012 are $31.8 million and $(0.9) million, respectively. The estimated net actuarial loss and prior year service cost for the post-retirement benefit plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2012 are each less than $0.3 million. As permitted under ASC 715, (formerly SFAS 87 and paragraph 53 of SFAS 106), the amortization of any prior service cost is determined using a straight-line amortization of the cost over the average remaining service period of employees expected to receive benefits under the plan.

The 2011 and 2010 after tax adjustments for additional minimum pension liability resulted in other comprehensive loss of $54.5 million and $5.6 million, respectively.

* Includes $(1.6) million, $0 million and $0.5 million of defined benefit plan (expense) income and $0.9 million, $1.2 million and $1.7 million of defined contribution plans expense that were included in earnings from discontinued operations for 2011, 2010 and 2009, respectively.

50

12.    Pension and Other Post-retirement Benefits (continued)

Assumptions

Actuarial assumptions used to determine benefit obligations at December 31 are as follows:

	Pension Benefits						Post-retirement Benefits
	2011			2010			2011			2010
Discount rate		4.90	%		5.35	%		4.90	%		5.35	%
Average salary increases		4.00	%		4.00	%		4.00	%		4.00	%

Actuarial assumptions used to determine net periodic benefit cost for the year ended December 31 are as follows:

	Pension Benefits									Post-retirement Benefits
Years ended December 31	2011			2010			2009			2011			2010			2009
Discount rate		5.35	%		5.80	%		6.60	%		5.35	%		5.80	%		6.60	%
Expected long-term return on plan assets		8.75	%		8.75	%		8.75	%		n/a			n/a			n/a
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%

In developing the expected long-term rate of return assumption, the company evaluated its pension plan’s target and actual asset allocation and expected long-term rates of return of equity and bond indices. The company also considered its pension plan’s historical ten-year and 25-year compounded annualized returns of 5.5 percent and 9.2 percent, respectively.

Assumed health care cost trend rates

Assumed health care cost trend rates as of December 31 are as follows:

	2011			2010
Health care cost trend rate assumed for next year		10.00	%		10.00	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		5.00	%		5.00	%
Year that the rate reaches the ultimate trend rate		2016			2015

A one-percentage-point change in the assumed health care cost trend rates would not result in a material impact on the company’s consolidated financial statements.

Plan Assets

The company’s pension plan weighted asset allocations as of December 31 by asset category are as follows:

Asset Category	2011			2010
Equity securities		55	%		62	%
Debt securities		37			30
Private equity		5			6
Other		3			2
		100	%		100	%

51

12.    Pension and Other Post-retirement Benefits (continued)

The following tables present the fair value measurement of the company’s plan assets as of December 31, 2011 and 2010 (dollars in millions)

			December 31, 2011
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs  (Level 3)
Short-term investments	$	39.7	$	-	$	-	$	39.7
Equity Securities
Common stocks		267.6		267.6		-		-
Preferred stocks		-		-		-		-
Commingled equity funds		146.1		-		146.1		-
Fixed Income Securities
U.S. Treasury securities		74.8		74.8		-		-
Government agency securities		3.7		-		3.7		-
Corporate asset backed securities		0.2		-		0.2		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		1.2		-		1.2		-
Other fixed income securities		92.4		-		92.2		0.2
Commingled fixed income funds		106.6		-		106.6		-
Other types of investments
Private equity		34.7		-		-		34.7
Total fair value of plan asset investments	$	767.0	$	342.4	$	350.0	$	74.6
Non-investment plan assets		2.0
Total plan assets	$	769.0

			December 31, 2010
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs (Level 3)
Short-term investments	$	12.8	$	-	$	0.1	$	12.7
Equity Securities
Common stocks		279.0		279.0		-		-
Preferred stocks		0.1		0.1		-		-
Commingled equity funds		121.3		-		121.3		-
Fixed Income Securities
U.S. Treasury securities		42.2		42.2		-		-
Government agency securities		6.5		-		6.5		-
Corporate asset backed securities		3.1		-		3.1		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		2.4		-		2.4		-
Other fixed income securities		31.1		-		30.9		0.2
Commingled fixed income funds		104.1		-		104.1		-
Other types of investments
Private equity		37.7		-		-		37.7
Total fair value of plan asset investments	$	640.3	$	321.3	$	268.4	$	50.6
Non-investment plan assets		0.5
Total plan assets	$	640.8

52

12.    Pension and Other Post-retirement Benefits (continued)

The following table presents a reconciliation of the fair value measurements using significant unobservable inputs (Level 3) as of December 31, 2011 and 2010 (dollars in millions):

	Short Term Investments		Other Fixed Income Securities		Private Equity			Total
Balance at December 31, 2009	$	28.2	$	0.2	$	29.4		$	57.6
Actual return (loss) on plan assets:
Relating to assets still held at the reporting date		-		-		4.0			4.0
Relating to assets sold during the period		-		-		(0.1	)		(0.1	)
Purchases, sales and settlements		27.0		-		4.4			(11.1	)
Transfers in and/or out of Level 3		-		0.2		-			0.2
Balance at December 31, 2010	$	12.7	$	0.2	$	37.7		$	50.6
Actual (loss) return on plan assets:
Relating to assets still held at the reporting date		-		-		(4.4	)		(4.4	)
Relating to assets sold during the period		-		-		9.8			9.8
Purchases, sales and settlements		27.0		-		(8.4	)		18.6
Balance at December 31, 2011	$	39.7	$	0.2	$	34.7		$	74.6

The company’s investment policies employ an approach whereby a diversified blend of equity and bond investments is used to maximize the long-term return of plan assets for a prudent level of risk. Equity investments are diversified across domestic and non-domestic stocks, as well as growth, value, and small to large capitalizations. Bond investments include corporate and government issues, with short-, mid- and long-term maturities, with a focus on investment grade when purchased. The company’s current allocation to equity managers is between 50 to 60 percent with the remainder allocated primarily to bonds and a small allocation to private equity managers and cash. Investment and market risks are measured and monitored on an ongoing basis through regular investment portfolio reviews, annual liability measurements and periodic asset/liability studies.

53

12.    Pension and Other Post-retirement Benefits (continued)

The company’s actual asset allocations are in line with target allocations. The company regularly reviews its actual asset allocation and periodically rebalances its investments to the targeted allocation when considered appropriate.

There were 48,590 shares of the company’s Class A Common Stock and 9,388 shares of Common Stock included in plan assets at December 31, 2011. The total market value of these shares at December 31, 2011 is $2.3 million.

Cash Flows

In 2011, the company made contributions of $175.0 million and is not required to make a contribution in 2012.

Estimated Future Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid:

Years ending December 31 (dollars in millions)	Pension Benefits	Post-retirement Benefits
2012	$      59.8	$       1.0
2013	60.1	1.0
2014	60.1	1.0
2015	60.6	0.9
2016	60.8	0.9
2017 – 2021	306.9	4.2

13.    Investment in RBC Shares

As discussed in Note 2, the company received approximately 2.83 million of RBC shares as a part of the proceeds of its sale of EPC to RBC. The value of those shares at December 31, 2011 was $144.4 million. One half of the RBC shares are classified as available for sale securities and are recorded at fair value with the unrealized after-tax gain of $1.2 million included in other comprehensive loss. The company entered into an equity collar contract for the remaining half of the RBC shares that are classified as trading securities. The shares are recorded at fair value with the unrealized pretax gain of $1.9 million included in earnings and classified as other (income) expense–net, in the consolidated statements of earnings. See Note 1 for further discussion regarding the collar. The shares that the company received from RBC on August 22, 2011 are restricted securities under the Securities Act of 1933, as amended (the “Securities Act”). Subject to certain conditions included in the Shareholders Agreement, the company may sell the RBC shares at prices and on terms to be determined at or prior to the time of sale pursuant to a shelf registration statement that became effective upon filing with the SEC on November 10, 2011. In addition, under Rule 144 under the Securities Act as currently in effect, a person who acquired shares of common stock from the issuer and who has beneficially owned the shares of common stock for at least six months is entitled to sell such shares of common stock without registration under the Securities Act, so long as (i) such person is not deemed to have been the issuer’s affiliate at the time of, or at any time during three months preceding, the sale and (ii) the issuer has filed all required reports under Section 13 or 15(d) of the Exchange Act, as applicable, during the twelve months preceding such sale (other than current reports on Form 8-K).

14.    Ashland City, TN Facility Flood

Starting May 3, 2010, production at the company’s largest water heater manufacturing plant located in Ashland City, TN was temporarily shut down due to flooding of the Cumberland River. Water heater production was shifted to other company plants located in the United States, Canada and Mexico. The company resumed production at the Ashland City, TN plant in June 2010. Impact from the flood was essentially completed by year end 2010.

54

14.    Ashland City, TN Facility Flood (continued)

As of December 31, 2010, the company recorded flood related expense of $35.4 million, net of insurance proceeds, consisting of the following:

(dollars in millions)
Repair or write off of buildings and equipment	$	36.1
Net inventory loss		16.4
Site cleanup and restoration		14.8
		67.3
Less: insurance proceeds		31.9
Total flood related expense	$	35.4

The buildings and equipment of the Ashland City, TN plant sustained damages due to the flooding. As of December 31, 2010, restoration of manufacturing equipment was complete and office space was nearing completion. The carrying value of fixed assets destroyed in the flood was written off, totaling $14.0 million. An additional $22.1 million was expensed to repair and refurbish damaged equipment to pre-flood condition.

The net inventory loss, totaling $16.4 million, included the cost of raw materials, work-in-process and finished good inventories that were not able to be used or sold due to flood damage.

Site cleanup and restoration began as soon as the flood waters subsided. The company engaged outside contractors to pump out water and clean and sanitize the facilities and the grounds of the manufacturing facility prior to access by company personnel. Employees normally engaged in the production of water heaters were utilized in the cleanup and repair of the facility and equipment, assessment and recovery of inventories and other aspects of the site restoration. Internal and external costs associated with site restoration and cleanup totaled $14.8 million.

Insurance proceeds

In 2010, the company maintained property damage and business interruption insurance coverage applicable to its Ashland City, TN plant totaling $30 million. The company also had federal flood insurance policies and $1.9 million was recovered. As of December 31, 2010 the company had received insurance proceeds of $31.9 million.

Government Assistance

In addition, the company received assistance from the State of Tennessee as well as local governmental agencies as incentive to reinvest in the Ashland City facility. Those incentives were in the form of grants, future tax credits and the purchase of certain property. The benefits, collectively, totaled approximately $7 million in 2010, of which $1.4 million of income was recorded in cost of goods sold in the third quarter of 2010. In the fourth quarter of 2010, $5.6 million was recorded including $1.3 million in cost of goods sold, $2.3 million in other income and $2.0 million as an offset to direct flood related expenses.

15.    Income Taxes

The components of the provision for income taxes from continuing operations consisted of the following:

Years ended December 31 (dollars in millions)	2011			2010			2009
Current:
Federal	$	(28.0	)	$	(2.9	)	$	16.0
State		(5.2	)		2.4			2.9
International		4.9			14.1			12.9
Deferred:
Federal		63.3			7.0			3.2
State		11.9			0.5			(1.1	)
International		3.4			(3.8	)		(3.0	)
	$	50.3		$	17.3		$	30.9

55

15.    Income Taxes (continued)

The provision for income taxes differs from the U.S. federal statutory rate due to the following items:

Years ended December 31	2011			2010			2009
Provision at U.S. federal statutory rate		35.0	%		35.0	%		35.0	%
State income and franchise taxes, net of federal benefit		3.2			1.6			2.9
International income tax rate differential		(4.3	)		(13.4	)		(6.2	)
Research tax credits		(0.6	)		(0.4	)		(0.7	)
State tax credits		(2.3	)		-			-
Other		0.1			0.5			2.7
		31.1	%		23.3	%		33.7	%

Components of earnings from continuing operations before income taxes were as follows:

Years ended December 31 (dollars in millions)	2011		2010		2009
United States	$	117.8	$	12.4	$	48.9
International		43.7		62.0		42.9
	$	161.5	$	74.4	$	91.8

Total income taxes paid by the company including discontinued operations amounted to $117.2 million, $12.3 million, and $5.6 million in 2011, 2010 and 2009, respectively.

During 2011, the company determined that certain undistributed foreign earnings associated with the proceeds from the sale of EPC in foreign jurisdictions were not considered permanently reinvested. Concurrent with the sale of EPC, the company recorded a U.S. tax provision of $56.5 million in discontinued operations for U.S. income taxes on those foreign earnings. At December 31, 2011, the company had undistributed foreign earnings of $633.9 million, of which $377.8 million are considered permanently reinvested. No U.S. income tax provision or foreign withholding tax provisions have been made on foreign earnings that remain permanently reinvested. Determination of the amount of unrecognized deferred tax liability on the undistributed earnings considered permanently reinvested is not practicable. In addition, no provision or benefit for U.S. income taxes has been made on foreign currency translation gains or losses. As of December 31, 2011, $463.3 million of cash and cash equivalents were held by our foreign subsidiaries.

The tax effects of temporary differences of assets and liabilities between income tax and financial reporting are as follows:

December 31 (dollars in millions)

	2011					2010
		Assets			Liabilities		Assets			Liabilities
Employee benefits	$	71.5		$	-	$	95.0		$	-
Product liability and warranties		60.6			-		58.9			-
Inventories		-			3.3		-			3.3
Accounts receivable		9.6			-		7.4			-
Property, plant and equipment		-			35.1		-			29.9
Intangibles		-			29.1		-			28.7
Environmental		3.3			-		3.5			-
RBC stock and collar		-			8.5		-			-
Undistributed foreign earnings		-			56.5		-			-
Tax loss and credit carryovers		17.0			-		16.0			-
All other		0.4			-		-			0.1
Valuation allowance		(8.4	)		-		(1.9	)		-
	$	154.0		$	132.5	$	179.0		$	62.0
Net asset				$	21.5				$	117.0

56

15.  Income Taxes (continued)

These deferred tax assets and liabilities are classified in the balance sheet as current or long-term based on the balance sheet classification of the related assets and liabilities as follows:

December 31 (dollars in millions)	2011			2010
Current deferred income tax assets	$	24.6		$	27.3
Long-term deferred income tax (liabilities) assets		(3.1	)		89.7
Net asset	$	21.5		$	117.0

A reconciliation of the beginning and ending amounts of tax loss carryovers, credit carryovers and valuation allowances follows:

December 31 (dollars in millions)

	Net Operating Losses and Tax Credits					Valuation Allowances
	2011			2010		2011			2010
Beginning balance	$	16.0		$	14.1	$	1.9		$	1.5
Additions		10.3			1.9		6.6			0.4
Reductions		(9.3	)		-		(0.1	)		-
Ending balance	$	17.0		$	16.0	$	8.4		$	1.9

The company has foreign net operating loss carryovers that expire in 2014 through 2019, an alternative minimum tax credit carryover that does not expire, a foreign tax credit carryover that expires in 2021, and state and local net operating loss carryovers that expire between 2012 and 2030.

A reconciliation of the beginning and ending amount of unrecognized benefits is as follows:

(Dollars in millions)	2011			2010
Balance at January 1	$	2.0		$	3.8
Additions based on tax positions related to the current year		-			0.1
Reductions for tax positions of prior years		(0.2	)		(1.9	)
Balance at December 31	$	1.8		$	2.0

The amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate is $1.3 million. The company recognizes potential interest and penalties related to unrecognized tax benefits as a component of tax expense. At December 31, 2011 there was $0.5 million of interest and penalties accrued. There was no net change to the interest and penalty accrual during 2011. It is anticipated there will be a $0.4 million decrease in total amount of unrecognized tax benefits in the next 12 months. The company’s U.S. federal income tax returns for 2008-2011 are subject to audit. The company is subject to state and local income tax audits for tax years 2000-2011. The company is subject to non-U.S. income tax examinations for years 2005-2011.

57

16.  Commitments and Contingencies

The company is a potentially responsible party in 14 judicial and administrative proceedings initiated on behalf of various state and federal regulatory agencies seeking to clean up sites which have been environmentally impacted and to recover costs they have incurred or will incur as to the sites.

The company has established reserves for the sites and insurance proceeds and potential recovery from third parties are available to cover a portion of the company’s potential liability. The company believes that any environmental claims for these sites in excess of reserves, insurance proceeds and indemnified amounts will not have a material effect on its financial position or results of operations.

The company is subject to various claims and pending lawsuits for product liability and other matters arising out of the conduct of the company’s business. With respect to product liability claims, the company has self-insured a portion of its product liability loss exposure for many years. The company has established reserves which it believes are adequate to cover incurred claims. For the years ended December 31, 2011 and 2010, the company had $125 million of product liability insurance for individual losses in excess of $5 million. The company periodically reevaluates its exposure on claims and lawsuits and makes adjustments to its reserves as appropriate. The company believes, based on current knowledge, consultation with counsel, adequate reserves and insurance coverage, that the outcome of such claims and lawsuits will not have a material adverse effect on the company’s financial position, results of operations or cash flows.

17.  Operations by Segment

Prior to the sale of EPC the company had identified two segments, Water Products Company and EPC. As a result of the sale of EPC and a change in management reporting, the company reconsidered its segment reporting in the fourth quarter of 2011 and determined that it is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless, oil and electric water heaters and commercial water heating equipment. Both segments primarily serve their respective regions of the world. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing and non-condensing boilers and water system tanks. The Rest of World segment also manufactures and markets water treatment products, primarily in Asia.

The accounting policies of the reportable segments are the same as those described in the “Summary of Significant Accounting Policies” outlined in Note 1. Operating earnings, defined by the company as earnings before interest, taxes, general corporate and corporate research and development expenses, was used to measure the performance of the segments.

	Earnings									Net Sales
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
North America	$	154.0		$	91.2		$	115.8		$	1,289.5		$	1,155.4		$	1,135.9
Rest of World		42.7			42.4			33.0			455.6			368.9			256.5
Inter-segment		(0.2	)		(0.7	)		0.1			(34.6	)		(35.0	)		(17.4	)
Total segments – operating earnings	$	196.5		$	132.9		$	148.9		$	1,710.5		$	1,489.3		$	1,375.0
General corporate and research and development expenses		(25.7	)		(51.6	)		(50.3	)
Interest expense		(9.3	)		(6.9	)		(7.2	)
Earnings before income taxes		161.5			74.4			91.4
Provision for income taxes		(50.3	)		(17.3	)		(30.9	)
Earnings from continuing operations	$	111.2		$	57.1		$	60.5

In 2011, sales to the North America segment’s two largest customers were $273.1 million and $194.7 million which represent 16 percent and 11 percent of the company’s net sales, respectively. In 2010, sales to the North America segment’s two largest customers were $237.9 million and $177.3 million which represent 16 percent and 12 percent of the company’s net sales, respectively. North America operating earnings includes an equity loss in joint venture of $0.4 million in 2009.

58

17.  Operations by Segment (continued)

Assets, depreciation and capital expenditures by segment

	Total Assets (December 31)						Depreciation and Amortization (Years Ended December 31)						Capital Expenditures (Years Ended December 31)
(dollars in millions)	2011		2010		2009		2011		2010		2009		2011		2010		2009
North America	$	1,319.2	$	868.3	$	826.9	$	33.9	$	30.2	$	32.2	$	31.6	$	37.8	$	26.9
Rest of World		342.4		299.7		268.5		12.4		10.0		5.6		20.5		13.8		15.1
Corporate assets		687.4		271.0		235.2		0.7		0.6		0.5		1.4		1.9		0.7
EPC discontinued operations		-		671.6		642.4		-		-		-		-		-		-
Total	$	2,349.0	$	2,110.6	$	1,973.0	$	47.0	$	40.8	$	38.3	$	53.5	$	53.5	$	42.7

The majority of corporate assets consist of cash and cash equivalents and deferred income taxes.

Net sales and long-lived assets by geographic location

The following data by geographic area includes net sales based on product shipment destination and long-lived assets based on physical location. Long-lived assets include net property, plant and equipment and other long-term assets and long-lived assets of previously owned businesses.

	Long-lived Assets							Net Sales
(dollars in millions)	2011		2010		2009			2011		2010		2009
United States	$	218.2	$	173.2	$	169.2	United States	$	1,094.3	$	960.4	$	959.0
China		70.7		57.1		53.3	China		382.2		304.4		222.0
Canada		20.9		22.2		22.5	Canada		160.2		160.4		150.4
Other Foreign		32.0		31.2		26.4	Other Foreign		73.8		64.1		43.6
Total	$	341.8	$	283.7	$	271.4	Total	$	1,710.5	$	1,489.3	$	1,375.0

59

18.  Quarterly Results of Operations (Unaudited)

(dollars in millions, except per share amounts)
	1st Quarter				2nd Quarter					3rd Quarter				4th Quarter
		2011		2010		2011		2010			2011		2010		2011		2010
Net sales	$	417.4	$	366.7	$	405.3	$	375.0		$	412.0	$	377.4	$	475.8	$	370.2
Gross profit		127.0		108.3		111.9		114.2			118.7		107.2		155.0		116.3
Earnings
Continuing operations		24.2		21.3		28.6		(0.9	)		26.9		16.2		31.5		20.5
Discontinued operations		16.8		9.5		21.7		17.5			155.4		15.8		0.6		11.6
Net earnings		41.0		30.8		50.3		16.6			182.3		32.0		32.1		32.1
Net loss attributable to noncontrolling interest
Continuing operations		-		0.1		-		-			-		-		-		0.1
Discontinued operations		-		-		-		-			-		-		-		-
Net earnings attributable to A. O. Smith Corporation	$	41.0	$	30.9	$	50.3	$	16.6		$	182.3	$	32.0	$	32.1	$	32.2
Basic earnings (loss) per share
Continuing operations		0.52		0.47		0.62		(0.02	)		0.58		0.35		0.68		0.45
Discontinued operations		0.37		0.21		0.47		0.38			3.36		0.35		0.01		0.25
Net		0.89		0.68		1.09		0.36			3.94		0.70		0.69		0.70
Diluted earnings (loss) per share
Continuing operations		0.52		0.46		0.62		(0.02	)		0.58		0.35		0.68		0.44
Discontinued operations		0.36		0.21		0.46		0.38			3.33		0.34		0.01		0.25
Net		0.88		0.67		1.08		0.36			3.91		0.69		0.69		0.69
Common dividends declared		0.14		0.13		0.14		0.13			0.16		0.14		0.16		0.14

Net earnings per share are computed separately for each period and, therefore, the sum of such quarterly per share amounts may differ from the total for the year.

ITEM 9 - CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A - CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, have evaluated the effectiveness of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) under the Securities Exchange Act of 1934, as amended (“the Exchange Act”)) as of the end of the period covered by this report. Based on such evaluations, our Chief Executive Officer and Chief Financial Officer have concluded that, as of the end of such period our disclosure controls and procedures are effective in recording, processing, summarizing, and reporting, on a timely basis, information required to be disclosed by us in the reports that we file or submit under the Exchange Act, and that information is accumulated and communicated to the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely discussions regarding required disclosure.

60

Management Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Exchange Act Rule 13a-15(f). Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our internal control over financial reporting based on the Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, our management has concluded that, as of December 31, 2011, our internal control over financial reporting was effective.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Ernst and Young LLP, an independent registered public accounting firm, has audited our consolidated financial statements and the effectiveness of internal controls over financial reporting as of December 31, 2011 as stated in their report which is included herein.

Changes in Internal Control Over Financial Reporting

During the year ended December 31, 2011, we acquired Lochinvar, a privately held manufacturer of high-efficiency boilers used in commercial and residential hydronic heating and hot water applications. We have not yet completed an evaluation of the effectiveness of internal controls over financial reporting and Lochinvar was not in scope in 2011. The total and net assets as of December 31, 2011 were $454.2 million and $410.2 million, respectively. Revenues and net income contributed by Lochinvar to A. O. Smith’s consolidated statement of earnings for the year ended December 31, 2011 were $75.9 million and $5.6 million, respectively.

Other than the item described above, there have been no significant changes in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

ITEM 9B - OTHER INFORMATION

None

61

Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

A.O. Smith Corporation

We have audited A.O. Smith Corporation’s internal control over financial reporting as of December 31, 2011, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the COSO criteria). A.O. Smith Corporation’s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

As indicated in the accompanying report on Changes in Internal Control Over Financial Reporting, management’s assessment of and conclusion on the effectiveness of internal control over financial reporting did not include the internal controls of Lochinvar, which is included in the December 31, 2011 consolidated financial statements of A. O. Smith Corporation and constituted $454.2 million and $410.2 million of total and net assets, respectively, as of December 31, 2011 and $75.9 million and $5.6 million of revenues and net income, respectively, for the year then ended. Our audit of internal control over financial reporting of A. O. Smith Corporation also did not include an evaluation of the internal control over financial reporting of Lochinvar.

In our opinion, A.O. Smith Corporation maintained, in all material respects, effective internal control over financial reporting as of December 31, 2011, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of A.O. Smith Corporation as of December 31, 2011 and 2010, and the related consolidated statements of earnings, comprehensive earnings, stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2011 and our report dated February 27, 2012 expressed an unqualified opinion thereon.

Ernst & Young LLP

Milwaukee, Wisconsin

February 27, 2012

62

PART III

ITEM 10 - DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information included under the headings “Election of Directors” and “Board Committees” in our definitive Proxy Statement for the 2012 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) is incorporated herein by reference. The information required regarding Executive Officers of the company is included in Part I of this Annual Report on Form 10-K under the caption “Executive Officers of the Company.”

We have a separately designated Audit Committee on which Gene C. Wulf, Gloster B. Current, Jr., Mark D. Smith and Idelle K. Wolf serve, with Mr. Wulf, as Chairperson. All members are independent under applicable SEC and New York Stock Exchange rules; Ms. Wolf and Mr. Wulf are “audit committee financial experts” in accordance with SEC rules.

We have adopted a Financial Code of Ethics applicable to our principal executive officer, principal financial officer and principal accounting officer. As a best practice, this code has been executed by all other company officers and key financial and accounting personnel as well. In addition, we have adopted a general code of business conduct for our directors, officers and all employees, which is known as the A. O. Smith Guiding Principles. The Financial Code of Ethics, the A. O. Smith Guiding Principles and other company corporate governance matters are available on our website at www.aosmith.com. We are not including the information contained on our website as a part of or incorporating it by reference into, this Form 10-K. We intend to disclose on this website any amendments to, or waivers from, the Financial Code of Ethics or the A. O. Smith Guiding Principles that are required to be disclosed pursuant to SEC rules. There have been no waivers of the Financial Code of Ethics or the A. O. Smith Guiding Principles. Stockholders may obtain copies of any of these corporate governance documents free of charge by writing to the Corporate Secretary at the address on the cover page of this Form 10-K.

The information included under the heading “Compliance with Section 16(a) of the Securities Exchange Act” in our definitive Proxy Statement for the 2012 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) is incorporated herein by reference.

ITEM 11 - EXECUTIVE COMPENSATION

The information included under the headings “Executive Compensation,” “Director Compensation,” “Report of the Personnel and Compensation Committee” and “Compensation Committee Interlocks and Insider Participation” in the company’s definitive Proxy Statement for the 2012 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) is incorporated herein by reference.

ITEM 12 - SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information included under the headings “Principal Stockholders” and “Security Ownership of Directors and Management” in our definitive Proxy Statement for the 2012 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) is incorporated herein by reference.

63

Equity Compensation Plan Information

The following table provides information about our equity compensation plans as of December 31, 2011.

Plan Category	Number of securities to be issued upon the exercise of outstanding options, warrants and rights	Weighted-average exercise price of outstanding options, warrants and rights	Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in the first column)
Equity compensation plans approved by security holders	1,421,867	24.84	2,205,485
Equity compensation plans not approved by security holders	-	-	-
Total	1,421,867	24.84	2,205,485

ITEM 13 - CERTAIN RELATIONSHIPS, RELATED TRANSACTIONS AND DIRECTOR INDEPENDENCE

The information included under the headings “Director Independence and Financial Literacy”, “Compensation Committee Interlocks and Insider Participation” and “Procedure for Review of Related Party Transactions” in our definitive Proxy Statement for the 2012 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) is incorporated herein by reference.

ITEM 14 - PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information included under the heading “Report of the Audit Committee” in our definitive Proxy Statement for the 2012 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) required by this Item 14 is incorporated herein by reference.

64

PART IV

ITEM 15 - EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a) The following documents are filed as part of this Annual Report on Form 10-K:

1 .	Financial Statements of the Company
		Form 10-K Page Number
	The following consolidated financial statements of A. O. Smith Corporation are included in Item 8:
	Consolidated Balance Sheets at December 31, 2011 and 2010		27
	For each of the three years in the period ended December 31, 2011:
	-   Consolidated Statement of Earnings		28
	-   Consolidated Statement of Comprehensive Earnings		28
	-   Consolidated Statement of Cash Flows		29
	-   Consolidated Statement of Stockholders’ Equity		30
	Notes to Consolidated Financial Statement		31 -60
2 .	Financial Statement Schedules
	Schedule II - Valuation and Qualifying Accounts		69
	Schedules not included have been omitted because they are not applicable.
3.	Exhibits - see the Index to Exhibits on pages 67-68 of this report. Each management contract or compensatory plan or arrangement required to be filed as an exhibit to this report on Form 10-K are listed as Exhibits 10(a) through 10(m) in the Index to Exhibits.
	Pursuant to the requirements of Rule 14a-3(b)(10) of the Securities Exchange Act of 1934, as amended, we will, upon request and upon payment of a reasonable fee not to exceed the rate at which such copies are available from the Securities and Exchange Commission, furnish copies to our security holders of any exhibits listed in the Index to Exhibits.

65

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on behalf of the undersigned, thereunto duly authorized.

A. O. SMITH CORPORATION
By:	/s/ Paul W. Jones
	Paul W. Jones
	Chief Executive Officer
Date:	February 27, 2012

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below as of February 27, 2012 by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Name and Title	Signature
PAUL W. JONES Chairman of the Board of Directors and Chief Executive Officer	/s/ Paul W. Jones Paul W. Jones
AJITA G. RAJENDRA Director President and Chief Operating Officer	/s/ Ajita G. Rajendra Ajita G. Rajendra
JOHN J. KITA Executive Vice President and Chief Financial Officer	/s/ John J. Kita John J. Kita
DANIEL L. KEMPKEN Vice President and Controller	/s/ Daniel L. Kempken Daniel L. Kempken
RONALD D. BROWN Director	/s/ Ronald D. Brown Ronald D. Brown
GLOSTER B. CURRENT, Jr. Director	/s/ Gloster B. Current, Jr. Gloster B. Current, Jr.
WILLIAM P. GREUBEL Director	/s/ William P. Greubel William P. Greubel
ROBERT J. O’TOOLE Director	/s/ Robert J. O’Toole Robert J. O’Toole
MATHIAS F. SANDOVAL Director	/s/ Mathias F. Sandoval Mathias F. Sandoval
BRUCE M. SMITH Director	/s/ Bruce M. Smith Bruce M. Smith
MARK D. SMITH Director	/s/ Mark D. Smith Mark D. Smith
IDELLE K. WOLF Director	/s/ Idelle K. Wolf Idelle K. Wolf
GENE C. WULF Director	/s/ Gene C. Wulf Gene C. Wulf

66

INDEX TO EXHIBITS

Exhibit Number	Description
(2)(i)		Agreement and Plan of Merger, dated as of December 9, 2008, among A. O. Smith Corporation, SICO Acquisition, LLC, Smith Investment Company and Smith Investment Company LLC, incorporated by reference to the current report on Form 8-K dated December 9, 2008.
(2)(ii)		Asset and Stock Purchase Agreement, dated as of December 12, 2010, by and between A. O. Smith Corporation and Regal Beloit Corporation, incorporated by reference to the current report on Form 8-K dated December 12, 2010.
(2)(iii)		Shareholder Agreement, dated August 22, 2011, between A. O. Smith Corporation and Regal Beloit Corporation, incorporated by reference to the current report on Form 8-K dated August 22, 2011.
(3)(i)		Amended and Restated Certificate of Incorporation of A. O. Smith Corporation as amended April 22, 2009, incorporated by reference to the current report on Form 8-K dated April 22, 2009.
(3)(ii)		By-laws of A. O. Smith Corporation as amended April 11, 2006, incorporated by reference to the quarterly report on Form 10-Q for the quarter ended June 30, 2006.
(4)	(a)	Amended and Restated Certificate of Incorporation of A. O. Smith Corporation as amended April 22, 2009, incorporated by reference to the quarterly report on Form 10-Q for the quarter ended June 30, 2009.
	(b)	Credit Agreement, dated as of November 12, 2010, among A. O. Smith Corporation, A. O Smith Enterprises Ltd., A. O. Smith International Holdings B.V., and the financial institutions and agents party thereto, incorporated by reference to the current report on Form 8-K dated November 12, 2010.
	(c)	The corporation has instruments that define the rights of holders of long-term debt that are not being filed with this Registration Statement in reliance upon Item 601(b)(4)(iii) of Regulation S-K. The Registrant agrees to furnish to the Securities and Exchange Commission, upon request, copies of these instruments.
(10)	Material Contracts
	(a)	A. O. Smith Combined Incentive Compensation Plan, incorporated by reference as Exhibit A to the Proxy Statement filed on March 5, 2009 for the 2009 Annual Meeting of Stockholders.
	(b)	A. O. Smith Corporation Executive Life Insurance Plan, as amended January 1, 2009, incorporated by reference to the annual report on Form 10-K for the fiscal year ended December 31, 2008.
	(c)	A. O. Smith Nonqualified Deferred Compensation Plan, adopted December 1, 2008, incorporated by reference to the annual report on Form 10-K for the fiscal year ended December 31, 2008.
	(d)	A. O. Smith Corporation Executive Supplemental Pension Plan, as amended January 1, 2009, incorporated by reference to the annual report on Form 10-K for the fiscal year ended December 31, 2008.
	(e)	A. O. Smith Corporation Executive Incentive Compensation Award Agreement, incorporated by reference to the Form S-8 Registration Statement filed by the corporation on July 30, 2007 (Reg. No. 333-144950).
	(f)	Offer Letter to Paul W. Jones, dated December 9, 2003, incorporated by reference to the annual report on Form 10-K for the fiscal year ended December 31, 2007.
	(g)	Offer Letter to Ajita G. Rajendra, dated September 20, 2004, incorporated by reference to the annual report on Form 10-K for the fiscal year ended December 31, 2007.

67

INDEX TO EXHIBITS (continued)

Exhibit Number	Description
	(h)	Amendment to Offer Letter to Ajita G. Rajendra Dated February 25, 2009, incorporated by reference to the annual report on Form 10-K for the fiscal year ended December 31, 2008.
	(i)	Summary of Directors’ Compensation, effective July 11, 2011.
	(j)	A. O. Smith Corporation Incentive Compensation Award Agreement, entered into with Paul W. Jones, dated November 5, 2008, incorporated by reference to the annual report on Form 10-K for the fiscal year ended December 21, 2008.
	(k)	A. O. Smith Corporation Senior Leadership Severance Plan, incorporated by Reference to the quarterly report for Form 10-Q for the quarter ended June 30, 2009.
	(l)	Form of A. O. Smith Corporation Special Retention Award Agreement, incorporated by reference to the quarterly report on Form 10-Q for the quarter ended March 31, 2011.
	(m)	Stockholder Agreement dated as of December 9, 2008, between A. O. Smith Corporation and each Smith Investment Company stockholder who becomes a signatory thereto, incorporated by reference to the current report on Form 8-K dated December 9, 2008.
(21)		Subsidiaries.
(23)		Consent of Independent Registered Public Accounting Firm.
(31.1)		Certification by the Chairman and Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act, dated February 27, 2012.
(31.2)		Certification by the Executive Vice-President and Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act, dated February 27, 2012.
(32.1)		Written Statement of the Chief Executive Officer Pursuant to 18 U.S.C. Section 1350.
(32.2)		Written Statement of the Chief Financial Officer Pursuant to 18 U.S.C. Section 1350.
(101)		The following materials from A. O. Smith Corporation’s Annual Report on Form 10-K for the fiscal year ended December 31, 2011 are furnished herewith, formatted in XBRL (Extensive Business Reporting Language): (i) the Consolidated Balance Sheets as of December 31, 2011 and 2010, (ii) the Consolidated Statement of Earnings for the three years ended December 31, 2011, (iii) the Consolidated Statement of Cash Flows for the three years ended December 31, 2011, (iv) the Consolidated Statement of Stockholders’ Equity for the three years ended December 31, 2011 and (iv) the Notes to Consolidated Financial Statements.

68

A. O. SMITH CORPORATION

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

(In millions)

Years ended December 31, 2011, 2010 and 2009

Description	Balance at Beginning of Year		Charged to Costs and Expenses1		Acquisition of Businesses		Deductions2			Balance at End of Year
2011:
Valuation allowance for trade and notes receivable	$	3.5	$	0.8	$	0.3	$	(1.2	)	$	3.4
Valuation allowance for deferred tax assets		1.9		6.6		-		(0.1	)		8.4
2010:
Valuation allowance for trade and notes receivable		3.4		0.2		-		(0.1	)		3.5
Valuation allowance for deferred tax assets		1.5		0.4		-		-			1.9
2009:
Valuation allowance for trade and notes receivable		2.8		1.7		-		(1.1	)		3.4
Valuation allowance for deferred tax assets		0.5		1.0		-		-			1.5

¹ Provision based upon estimated collection.

² Uncollectible amounts/expenditures or adjustments charged against the reserve.

69

EX-10.(I)

Exhibit 10(i)

SUMMARY OF DIRECTORS’ COMPENSATION

Effective July 11, 2011, compensation paid to non-employee directors of A. O. Smith Corporation is as follows:

• An annual cash retainer of $42,500, payable quarterly in advance, and $90,000 paid in A. O. Smith Corporation Common Stock.

• A fee of $1,500 for each board, committee and annual shareholder meeting attended; $3,000 for each Investment Policy Committee meeting.

• A fee of $500 for each telephonic board and committee meeting.

• A new director orientation meeting fee of $1,500.

• An annual retainer of $5,000 for Audit Committee members and $3,000 for the members of the Investment Policy Committee, Nominating and Governance Committee and Personnel and Compensation Committee.

• An annual retainer of $15,000 for the chairperson of the Audit Committee and $10,000 for the chairpersons of each of the Investment Policy Committee, Nominating and Governance Committee and Personnel and Compensation Committee.

• An annual retainer of $20,000 for the presiding director.

The foregoing does not reflect any changes to previously disclosed compensation for non-employee directors, except that effective July 11, 2011, A. O. Smith Corporation’s Board of Directors, upon recommendation of the Nominating and Governance Committee, increased the annual cash retainer from $35,000 to $42,500.

EX-21

Exhibit 21

SUBSIDIARIES: The following lists all subsidiaries and affiliates of A. O. Smith Corporation.

Name of Subsidiary	Jurisdiction in Which Incorporated
AOS Holding Company	Delaware
A. O. Smith International Corporation	Delaware
Flame Guard Water Heaters, Inc.	Delaware
Lochinvar, LLC	Delaware
SICO Acquisition, LLC	Delaware
Takagi—A. O. Smith Tankless Water Heater Company LLC	Delaware
American Water Heater Company	Nevada
State Industries, Inc.	Tennessee
A. O. Smith Holdings (Barbados) SRL	Barbados
Winston Park Insurance Company Ltd.	Barbados
A. O. Smith Enterprises Ltd.	Canada
A. O. Smith (China) Investment Co., Ltd.	China
A. O. Smith (China) Water Heater Co., Ltd.	China
A. O. Smith (China) Water Products Co., Ld.	China
A. O. Smith (Shanghai) Water Treatment Products Co., Ltd.	China
Nanjing A. O. Smith Gas Appliance Co., Ltd.	China
A. O. Smith L’eau chaude S.a.r.l.	France
A. O. Smith Warmwasser-Systemtechnik GmbH	Germany
A. O. Smith (Hong Kong) Limited	Hong Kong
A. O. Smith India Water Heating Private Limited	India
A. O. Smith Electric Motors (Ireland) Ltd.	Ireland
A. O. Smith Holdings (Ireland) Ltd.	Ireland
Productos de Agua, S. de R.L. de C.V.	Mexico
A.O. Smith Electrical Products B.V.	The Netherlands
A.O. Smith Holdings II B.V.	The Netherlands
A.O. Smith International Holdings B.V.	The Netherlands
A.O. Smith Products v.o.f.	The Netherlands
A.O. Smith Water Products Company B.V.	The Netherlands
A. O. Smith Water FZE	United Arab Emirates
Lochinvar Limited	United Kingdom

EX-23

Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the Registration Statements (Form S-8 Nos. 333-92329, 333-92428, 333-144950 and 333-170436) pertaining to the A. O. Smith Corporation Long-Term Executive Incentive Compensation Plan, the A. O. Smith Combined Executive Incentive Compensation Plan and the A. O. Smith Combined Incentive Compensation Plan and in the related prospectuses of our reports dated February 27, 2012, with respect to the consolidated financial statements and schedule of A. O. Smith Corporation, and the effectiveness of internal control over financial reporting of A. O. Smith Corporation, included in this Annual Report (Form 10-K) for the year ended December 31, 2011.

ERNST & YOUNG LLP

Milwaukee, Wisconsin

February 27, 2012

EX-31.1

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Paul W. Jones, certify that:

1. I have reviewed this annual report on Form 10-K of A. O. Smith Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any changes in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 27, 2012

/s/ Paul W. Jones

Paul W. Jones

Chairman and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, John J. Kita, certify that;

1. I have reviewed this annual report on Form 10-K of A. O. Smith Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any changes in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors:

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 27, 2012

/s/ John J. Kita

John J. Kita

Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification Pursuant to 18 U.S.C. Section 1350,

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of A. O. Smith Corporation (the “Company”) on Form 10-K for the fiscal year ended December 31, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”). I, Paul W. Jones, Chairman and Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 27, 2012

/s/ Paul W. Jones

Paul W. Jones

Chairman and Chief Executive Officer

This certification accompanies this Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Certification Pursuant to 18 U.S.C. Section 1350,

As Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of A. O. Smith Corporation (the “Company”) on Form 10-K for the fiscal year ended December 31, 2011, as filed with the Securities and Exchange Commission on the date hereof (the “Report”). I, John J. Kita, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 27, 2012

/s/ John J. Kita

John J. Kita

Executive Vice President and Chief Financial Officer

This certification accompanies this Report pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by the Company for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Debt And Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2011

Debt And Lease Commitments [Abstract]

Schedule Of Debt And Lease Commitments

December 31 (dollars in millions)	2011		2010
Bank credit lines, average year-end interest rate of 6.8% for 2011 and 5.1% for 2010	$	6.2	$	6.5
Revolving credit agreement borrowings, average year-end interest rate of 1.8% for 2011 and 2010		330.0		115.0
Commercial paper, average year-end interest rate of 1.3% for 2011		27.7		-
Term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.9% for 2011 and 2010		68.3		86.9
Canadian revolving credit agreement borrowings, average year-end interest rate of 2.7% for 2010		-		22.6
Canadian term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.3% for 2011 and 2010		29.4		30.0
		461.6		261.0
Less long-term debt due within one year		18.6		18.6
Long-term debt	$	443.0	$	242.4

Schedule Of Maturities Of Long-Term Debt

Years ending December 31 (dollars in millions)	Amount
2012	$	18.6
2013		382.5
2014		14.4
2015		14.4
2016		14.4

Schedule Of Future Minimum Payments Under Non-Cancelable Operating Leases

Years ending December 31 (dollars in millions)	Amount
2012	$	12.4
2013		8.6
2014		7.5
2015		6.5
2016		4.6
Thereafter		10.9

XML

Discontinued Operations (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended			3 Months Ended	0 Months Ended	1 Months Ended	12 Months Ended
	Aug. 22, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jun. 30, 2011 China Facility [Member]	Aug. 22, 2011 EPC [Member]	Aug. 22, 2011 EPC [Member]	Dec. 31, 2011 EPC [Member]
Proceeds from sale of business segment		$ 752.5					$ 759.9
Proceeds from sale of business segment, shares	2.83					2.83	2.83
Working capital adjustment							7.4
Value of shares from sale of business segment		144.4					140.6
Income taxes paid								126.5
Commissions paid								21.4
Additional income tax accrual		56.5						56.5
Gain on sale of assets		(4.8)	(0.2)	(2.0)	4.8
Income taxes payable			2.5					34.2
Gain related to cumulative transaction adjustments								10.9
Current liabilities-net, EPC discontinued operations		31.5	122.6
Long-term liabilities-net, EPC discontinued operations		$ 8.7	$ 78.5

XML

Organization And Significant Accounting Policies (Summary Of Foreign Currency Forward Contracts By Currency) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	$ 32.6	$ 11.2
Sell	37.8	37.6
Euro [Member]
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	16.1
Sell	1.2	2.2
Canadian Dollar [Member]
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Sell	36.6	35.4
Mexican Peso [Member]
Contractual Amounts Of Foreign Currency Forward Contracts [Line Items]
Buy	$ 16.5	$ 11.2

XML

Debt And Lease Commitments (Schedule Of Debt And Lease Commitments) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Debt	$ 461.6	$ 261.0
Less long-term debt due within one year	18.6	18.6
Long-term debt	443.0	242.4
Bank Credit Lines [Member]
Debt Instrument [Line Items]
Debt	6.2	6.5
Line of credit facility, average year-end interest rate	6.80%	5.10%
Revolving Credit Agreement Borrowings [Member]
Debt Instrument [Line Items]
Debt	330.0	115.0
Line of credit facility, average year-end interest rate	1.80%	1.80%
Canadian Term Notes With Insurance Companies [Member]
Debt Instrument [Line Items]
Debt	29.4	30.0
Average interest rate at year-end	5.30%	5.30%
Debt instrument, maturity date	2018
Commercial Paper [Member]
Debt Instrument [Line Items]
Debt	27.7
Average interest rate at year-end	1.30%
Term Notes With Insurance Companies [Member]
Debt Instrument [Line Items]
Debt	68.3	86.9
Average interest rate at year-end	5.90%	5.90%
Canadian Revolving Credit Agreement Borrowings [Member]
Debt Instrument [Line Items]
Debt		$ 22.6
Line of credit facility, average year-end interest rate		2.70%

XML

Discontinued Operations (Components Of The Net Assets Of EPC Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Discontinued Operations [Abstract]
Trade receivables		$ 110.8
Inventory		135.9
Deferred taxes		2.2
Derivative contracts asset		17.4
Other current assets		6.0
Total Current Assets		272.3
Net property, plant and equipment		148.1
Goodwill		248.4
Other intangibles		2.8
Total Assets		671.6
Trade payables		89.5
Accrued payroll and benefits		15.2
Accrued liabilities		11.1
Product warranties		4.3
Income taxes		2.5
Total Current Liabilities	31.5	122.6
Deferred taxes		77.2
Other liabilities		1.3
Total Liabilities		201.1
Total Net Assets		$ 470.5

XML

Stock Based Compensation (Schedule Of Weighted-Average Fair Value Per Option At The Date Of Grant) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock Based Compensation [Abstract]
Expected life (years)	6.4	6.4	6.4
Risk-free interest rate	3.60%	3.60%	2.80%
Dividend yield	1.30%	1.90%	2.80%
Expected volatility	38.40%	38.70%	35.00%

XML

Operations By Segment (Schedule Of Assets, Depreciation And Capital Expenditures By Segment) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Total Assets	$ 2,349.0	$ 2,110.6	$ 1,973.0
Depreciation and Amortization	47.0	40.8	38.3
Capital Expenditures	53.5	53.5	42.7
EPC Discontinued Operations [Member]
Segment Reporting Information [Line Items]
Total Assets		671.6	642.4
Depreciation and Amortization
Capital Expenditures
Corporate Assets [Member]
Segment Reporting Information [Line Items]
Total Assets	687.4	271.0	235.2
Depreciation and Amortization	0.7	0.6	0.5
Capital Expenditures	1.4	1.9	0.7
North America [Member]
Segment Reporting Information [Line Items]
Total Assets	1,319.2	868.3	826.9
Depreciation and Amortization	33.9	30.2	32.2
Capital Expenditures	31.6	37.8	26.9
Rest Of World [Member]
Segment Reporting Information [Line Items]
Total Assets	342.4	299.7	268.5
Depreciation and Amortization	12.4	10.0	5.6
Capital Expenditures	$ 20.5	$ 13.8	$ 15.1

XML

Quarterly Results Of Operations (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Results Of Operations [Abstract]

Schedule Of Quarterly Results Of Operations

(dollars in millions, except per share amounts)
	1st Quarter				2nd Quarter					3rd Quarter				4th Quarter
		2011		2010		2011		2010			2011		2010		2011		2010
Net sales	$	417.4	$	366.7	$	405.3	$	375.0		$	412.0	$	377.4	$	475.8	$	370.2
Gross profit		127.0		108.3		111.9		114.2			118.7		107.2		155.0		116.3
Earnings
Continuing operations		24.2		21.3		28.6		(0.9	)		26.9		16.2		31.5		20.5
Discontinued operations		16.8		9.5		21.7		17.5			155.4		15.8		0.6		11.6
Net earnings		41.0		30.8		50.3		16.6			182.3		32.0		32.1		32.1
Net loss attributable to noncontrolling interest
Continuing operations		-		0.1		-		-			-		-		-		0.1
Discontinued operations		-		-		-		-			-		-		-		-
Net earnings attributable to A. O. Smith Corporation	$	41.0	$	30.9	$	50.3	$	16.6		$	182.3	$	32.0	$	32.1	$	32.2
Basic earnings (loss) per share
Continuing operations		0.52		0.47		0.62		(0.02	)		0.58		0.35		0.68		0.45
Discontinued operations		0.37		0.21		0.47		0.38			3.36		0.35		0.01		0.25
Net		0.89		0.68		1.09		0.36			3.94		0.70		0.69		0.70
Diluted earnings (loss) per share
Continuing operations		0.52		0.46		0.62		(0.02	)		0.58		0.35		0.68		0.44
Discontinued operations		0.36		0.21		0.46		0.38			3.33		0.34		0.01		0.25
Net		0.88		0.67		1.08		0.36			3.91		0.69		0.69		0.69
Common dividends declared		0.14		0.13		0.14		0.13			0.16		0.14		0.16		0.14

XML

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2011

Acquisitions [Abstract]

Summary Of Preliminary Estimate Of Fair Value Of The Assets Acquired And Liabilities Assumed Due To Acquisition

August 26, 2011 (dollars in millions)
Current assets, net of cash acquired	$	54.0
Property, plant and equipment		41.9
Intangible assets		258.3
Other assets		0.1
Goodwill		111.4
Total assets acquired		465.7
Current liabilities		24.3
Long-term liabilities		3.5
Total liabilities assumed		27.8
Net assets acquired	$	437.9

Schedule Of Pro Forma Unaudited Results Of Operations Assuming Acquisition At Beginning Of Fiscal Year

	Years ended December 31,
	2011		2010
Net sales	$	1,835.8	$	1,664.0
Earnings from continuing operations		122.5		71.5
Earnings per common share:
Basic	$	2.66	$	1.56
Diluted	$	2.63	$	1.55

XML

Stock Based Compensation (Schedule Of Share Unit Activity Under The Plan) (Details) (Restricted Stock And Share Units [Member], USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restricted Stock And Share Units [Member]
Stock Based Compensation [Line Items]
Number of Units Outstanding, Beginning of Period	473,438
Number of Units - Granted	75,625	101,873	159,801
Number of Units - Vested	(233,702)
Number of Units - Forfeited/cancelled	(28,807)
Number of Units Outstanding, End of Period	286,554	473,438
Weighted-Average Grant Date Value, Beginning of Period	$ 22.43
Weighted-Average Grant Date Value - Granted	$ 43.12
Weighted-Average Grant Date Value - Vested	$ 22.72
Weighted-Average Grant Date Value - Forfeited/cancelled	$ 25.28
Weighted-Average Grant Date Value, End of Period	$ 27.36	$ 22.43

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Stockholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 14, 2007
Stockholders Equity [Line Items]
Preferred Stock, shares authorized	3,000,000
Preferred Stock, par value per share	$ 1
Dividends paid	$ 0.60	$ 0.54	$ 0.51
Number of shares authorized to be repurchased				1,500,000
Shares repurchased	611,589	0	0
Shares repurchased, value	$ 23.5
Smith Investment Company [Member]
Stockholders Equity [Line Items]
Common Stock, shares authorized	10,000,000
Common Stock, par value	$ 0.10
Common Stock [Member]
Stockholders Equity [Line Items]
Common Stock, shares authorized	60,000,000
Common Stock, par value	$ 1
Treasury stock, number of shares held	1,817,815	1,811,199
Class A Common Stock [Member]
Stockholders Equity [Line Items]
Common Stock, shares authorized	14,000,000
Common Stock, par value	$ 5
Shares converted into Common Stock	230,957	364,520	4,365,845
Treasury stock, number of shares held	32,595	32,595

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Pension And Other Post-Retirement Benefits (Schedule Of Estimated Future Payments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
2012	$ 59.8
2013	60.1
2014	60.1
2015	60.6
2016	60.8
Years 2017 - 2021	306.9
Post-Retirement Benefits[Member]
Pension And Other Post-Retirement Benefits [Line Items]
2012	1.0
2013	1.0
2014	1.0
2015	0.9
2016	0.9
Years 2017 - 2021	$ 4.2

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Discontinued Operations (Schedule Of The Cash Flow Provided By EPC Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Discontinued Operations [Abstract]
Earnings		$ 54.4	$ 29.1
Depreciation and amortization	16.5	26.1	29.2
Gain on sale of assets	(4.8)	(0.2)	(2.0)
Current assets and liabilities	(56.2)	(23.3)	74.5
Noncurrent assets and liabilities	0.9	4.5	9.9
Other	(1.7)		(0.7)
Cash (Used in) Provided by Discontinued Operating Activities	(2.3)	61.5	140.0
Capital expenditures	(10.5)	(14.3)	(14.3)
Proceeds on sale of assets	6.1	5.5	7.6
Proceeds from sale of operations	752.5
Payments associated with sale	(147.9)
Cash Provided by (Used in) Discontinued Investing Activities	600.2	(8.8)	(6.7)
Cash Flow Provided by Discontinued Operations	$ 597.9	$ 52.7	$ 133.3

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Stock Based Compensation (Schedule Of Changes In Option Shares) (Details) (USD $) In Millions, except Share data, unless otherwise specified					12 Months Ended									12 Months Ended												12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011 2011-$43.12 to $44.12 per share [Member]	Dec. 31, 2010 2010-$27.93 Per Share [Member]	Dec. 31, 2010 2009-$16.40 To $21.66 Per Share [Member]	Dec. 31, 2009 2009-$16.40 To $21.66 Per Share [Member]	Dec. 31, 2011 2011-$15.99 To $27.93 Per Share [Member]	Dec. 31, 2010 2011-$15.99 To $27.93 Per Share [Member]	Dec. 31, 2011 2011-$15.99 to $44.12 Per Share [Member]	Dec. 31, 2010 2011-$15.99 to $44.12 Per Share [Member]	Dec. 31, 2009 2011-$15.99 to $44.12 Per Share [Member]	Dec. 31, 2010 2010-$9.04 To $25.84 Per Share [Member]	Dec. 31, 2009 2010-$9.04 To $25.84 Per Share [Member]	Dec. 31, 2010 2009-$9.04 To $19.47 Per Share [Member]	Dec. 31, 2009 2009-$9.04 To $19.47 Per Share [Member]	Dec. 31, 2008 2009-$9.04 To $19.47 Per Share [Member]	Dec. 31, 2011 2011-$19.00 to $43.12 per share [Member]	Dec. 31, 2009 2011-$19.00 to $43.12 per share [Member]	Dec. 31, 2010 2010-$19.00 To $27.93 Per Share [Member]	Dec. 31, 2009 2010-$19.00 To $27.93 Per Share [Member]	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2010 Maximum [Member]	Dec. 31, 2009 Maximum [Member]	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2010 Minimum [Member]	Dec. 31, 2009 Minimum [Member]
Stock Based Compensation [Line Items]
Weighted-Avg. Per Share Exercise Price, beginning period		$ 22.17									$ 24.84
Weighted-Avg. Per Share Exercise Price - Granted		$ 27.93																					$ 44.12		$ 21.66	$ 43.12		$ 16.40
Weighted-Avg. Per Share Exercise Price - Exercised																							$ 27.93	$ 25.84	$ 19.47	$ 15.99	$ 9.04	$ 9.04
Weighted-Avg. Per Share Exercise Price - Forfeited																							43.12	27.93		19.00	19.00
Weighted-Avg. Per Share Exercise Price, ending period		$ 22.17									$ 24.84												$ 44.12			$ 15.99
Weighted-Avg. Per Share Exercise Price, Exercisable	$ 22.23
Outstanding, beginning balance		1,623,101	1,630,751	1,933,601							1,421,867	1,623,101	1,630,751
Granted					178,200	237,000		506,400
Exercised									(364,081)					(240,801)			(809,250)
Forfeited																			(15,353)		(3,849)
Outstanding, ending balance		1,623,101	1,630,751	1,933,601							1,421,867	1,623,101	1,630,751
Exercisable at ending period	989,933	951,035	831,401
Aggregate Intrinsic Value, Exercised										$ 7.7					$ 3.3			$ 8.1

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Pension And Other Post-Retirement Benefits (Schedule Of Weighted Asset Allocations By Asset Category) (Details)	Dec. 31, 2011	Dec. 31, 2010
Pension And Other Post-Retirement Benefits [Abstract]
Equity securities	55.00%	62.00%
Debt securities	37.00%	30.00%
Private equity	5.00%	6.00%
Other	3.00%	2.00%
Total	100.00%	100.00%

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Pension And Other Post-Retirement Benefits (Schedule Of Funded Status Of Defined Benefit Pension And Post-Retirement Benefit Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	$ 640.3
Contribution by the company	175.0
Curtailment			12.3
Plan assets at end of year	767.0		640.3
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Accumulated Benefit Obligation (ABO) at December 31	895.1		850.3
PBO at beginning of year	(862.1)		(826.7)
Service cost	(9.1)		(8.6)
Interest cost	(44.1)		(46.7)
Plan amendments	(1.6)
Actuarial (loss) gain including assumption changes	(52.0)		(38.7)
Benefits paid	60.4		58.6
PBO at end of year	(906.5)		(862.1)
Plan assets at beginning of year	640.8		594.0
Actual return on plan assets	11.3		74.8
Contribution by the company	176.9		30.6
Curtailment	2.0
Plan assets at end of year	768.6		640.8
Funded status	(137.9)		(221.3)
Non-current liabilities	(137.9)		(221.3)
Net pension liability at end of year	(137.9)	[1]	(221.3)	[1]
Net actuarial loss (gain)	532.0		447.2
Prior service cost	(8.9)		(12.7)
Total recognized in accumulated other comprehensive loss	523.1		434.5
Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
PBO at beginning of year	(14.9)		(17.0)
Service cost	(0.1)		(0.2)
Interest cost	(0.7)		(0.8)
Participant contributions	(0.3)		(0.4)
Actuarial (loss) gain including assumption changes	1.9		2.1
Benefits paid	1.4		1.4
PBO at end of year	(12.7)		(14.9)
Contribution by the company	1.1		1.0
Funded status	(12.7)		(14.9)
Current liabilities	(1.1)		(1.3)
Non-current liabilities	(11.6)		(13.6)
Net pension liability at end of year	(12.7)		(14.9)
Net actuarial loss (gain)	(2.8)		(3.3)
Total recognized in accumulated other comprehensive loss	(2.8)		(3.3)
Change In Fair Value [Member] | Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Benefits paid	(60.4)		(58.6)
Change In Fair Value [Member] | Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Participant contributions	0.3		0.4
Benefits paid	$ (1.4)		$ (1.4)

[1] In addition the company has recorded a liability for a foreign pension plan of $1.6 million and $1.6 million at December 31, 2011 and 2010, respectively and an accumulated other comprehensive loss of $2.1 million and $1.9 million at December 31, 2011 and 2010, respectively.

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Pension And Other Post-Retirement Benefits (Schedule Of Fair Value Measurement Of Plan Assets) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	$ 767.0	$ 640.3
Non-investment plan assets	2.0	0.5
Total plan assets	769.0	640.8
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	342.4	321.3
Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	350.0	268.4
Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	74.6	50.6	57.6
Other Fixed Income Securities [Member] | Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	0.2	0.2	0.2
Short-Term Investments [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	39.7	12.8
Short-Term Investments [Member] | Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments		0.1
Short-Term Investments [Member] | Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	39.7	12.7	28.2
Private Equity [Member] | Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	34.7	37.7	29.4
Preferred Stock [Member] | Equity Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments		0.1
Preferred Stock [Member] | Equity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments		0.1
Common Stock [Member] | Equity Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	267.6	279.0
Common Stock [Member] | Equity Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	267.6	279.0
Commingled Equity Funds [Member] | Equity Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	146.1	121.3
Commingled Equity Funds [Member] | Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	146.1	121.3
Fixed Income Securities [Member] | U.S. Treasury Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	74.8	42.2
Fixed Income Securities [Member] | U.S. Treasury Securities [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	74.8	42.2
Fixed Income Securities [Member] | Government Agency Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	3.7	6.5
Fixed Income Securities [Member] | Government Agency Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	3.7	6.5
Fixed Income Securities [Member] | Corporate Asset Backed Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	0.2	3.1
Fixed Income Securities [Member] | Corporate Asset Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	0.2	3.1
Fixed Income Securities [Member] | Corporate Collateralized Mortgage Backed Securities And Collateralized Mortgage Obligations [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	1.2	2.4
Fixed Income Securities [Member] | Corporate Collateralized Mortgage Backed Securities And Collateralized Mortgage Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	1.2	2.4
Fixed Income Securities [Member] | Other Fixed Income Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	92.4	31.1
Fixed Income Securities [Member] | Other Fixed Income Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	92.2	30.9
Fixed Income Securities [Member] | Other Fixed Income Securities [Member] | Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	0.2	0.2
Fixed Income Securities [Member] | Commingled Fixed Income Funds [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	106.6	104.1
Fixed Income Securities [Member] | Commingled Fixed Income Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	106.6	104.1
Other Types Of Investments [Member] | Private Equity [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	34.7	37.7
Other Types Of Investments [Member] | Private Equity [Member] | Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Total fair value of plan asset investments	$ 34.7	$ 37.7

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Stock Based Compensation (Schedule Of Weighted-Average Information By Range Of Exercise Prices For Stock Options Outstanding And Exercisable) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Stock Based Compensation [Line Items]
Options Outstanding at December 31, 2011	1,421,867
Options Exercisable at December 31, 2011	989,933
$15.99 To $19.47 [Member]
Stock Based Compensation [Line Items]
Range of Exercise Prices, minimum	$ 15.99
Range of Exercise Prices, maximum	$ 19.47
Options Outstanding at December 31, 2011	561,349
Options Outstanding, Weighted-Average Exercise Price	$ 18.86
Options Exercisable at December 31, 2011	426,899
Options Exercisable, Weighted-Average Exercise Price	$ 18.85
Weighted-Average Remaining Contractual Life, In Years	7
$21.34 To $24.02 [Member]
Stock Based Compensation [Line Items]
Range of Exercise Prices, minimum	$ 21.34
Range of Exercise Prices, maximum	$ 24.02
Options Outstanding at December 31, 2011	298,401
Options Outstanding, Weighted-Average Exercise Price	$ 23.18
Options Exercisable at December 31, 2011	294,851
Options Exercisable, Weighted-Average Exercise Price	$ 23.20
Weighted-Average Remaining Contractual Life, In Years	7
$25.84 To $43.12 [Member]
Stock Based Compensation [Line Items]
Range of Exercise Prices, minimum	$ 25.84
Range of Exercise Prices, maximum	$ 43.12
Options Outstanding at December 31, 2011	562,117
Options Outstanding, Weighted-Average Exercise Price	$ 31.67
Options Exercisable at December 31, 2011	268,183
Options Exercisable, Weighted-Average Exercise Price	$ 26.53
Weighted-Average Remaining Contractual Life, In Years	8

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Debt And Lease Commitments (Schedule Of Maturities Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Debt And Lease Commitments [Abstract]
2012	$ 18.6
2013	382.5
2014	14.4
2015	14.4
2016	$ 14.4

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Income Taxes

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Income Taxes

15.    Income Taxes

The components of the provision for income taxes from continuing operations consisted of the following:

Years ended December 31 (dollars in millions)	2011			2010			2009
Current:
Federal	$	(28.0	)	$	(2.9	)	$	16.0
State		(5.2	)		2.4			2.9
International		4.9			14.1			12.9
Deferred:
Federal		63.3			7.0			3.2
State		11.9			0.5			(1.1	)
International		3.4			(3.8	)		(3.0	)
	$	50.3		$	17.3		$	30.9

The provision for income taxes differs from the U.S. federal statutory rate due to the following items:

Years ended December 31	2011			2010			2009
Provision at U.S. federal statutory rate		35.0	%		35.0	%		35.0	%
State income and franchise taxes, net of federal benefit		3.2			1.6			2.9
International income tax rate differential		(4.3	)		(13.4	)		(6.2	)
Research tax credits		(0.6	)		(0.4	)		(0.7	)
State tax credits		(2.3	)		-			-
Other		0.1			0.5			2.7
		31.1	%		23.3	%		33.7	%

Components of earnings from continuing operations before income taxes were as follows:

Years ended December 31 (dollars in millions)	2011		2010		2009
United States	$	117.8	$	12.4	$	48.9
International		43.7		62.0		42.9
	$	161.5	$	74.4	$	91.8

Total income taxes paid by the company including discontinued operations amounted to $117.2 million, $12.3 million, and $5.6 million in 2011, 2010 and 2009, respectively.

During 2011, the company determined that certain undistributed foreign earnings associated with the proceeds from the sale of EPC in foreign jurisdictions were not considered permanently reinvested. Concurrent with the sale of EPC, the company recorded a U.S. tax provision of $56.5 million in discontinued operations for U.S. income taxes on those foreign earnings. At December 31, 2011, the company had undistributed foreign earnings of $633.9 million, of which $377.8 million are considered permanently reinvested. No U.S. income tax provision or foreign withholding tax provisions have been made on foreign earnings that remain permanently reinvested. Determination of the amount of unrecognized deferred tax liability on the undistributed earnings considered permanently reinvested is not practicable. In addition, no provision or benefit for U.S. income taxes has been made on foreign currency translation gains or losses. As of December 31, 2011, $463.3 million of cash and cash equivalents were held by our foreign subsidiaries.

The tax effects of temporary differences of assets and liabilities between income tax and financial reporting are as follows:

December 31 (dollars in millions)

	2011					2010
		Assets			Liabilities		Assets			Liabilities
Employee benefits	$	71.5		$	-	$	95.0		$	-
Product liability and warranties		60.6			-		58.9			-
Inventories		-			3.3		-			3.3
Accounts receivable		9.6			-		7.4			-
Property, plant and equipment		-			35.1		-			29.9
Intangibles		-			29.1		-			28.7
Environmental		3.3			-		3.5			-
RBC stock and collar		-			8.5		-			-
Undistributed foreign earnings		-			56.5		-			-
Tax loss and credit carryovers		17.0			-		16.0			-
All other		0.4			-		-			0.1
Valuation allowance		(8.4	)		-		(1.9	)		-
	$	154.0		$	132.5	$	179.0		$	62.0
Net asset				$	21.5				$	117.0

These deferred tax assets and liabilities are classified in the balance sheet as current or long-term based on the balance sheet classification of the related assets and liabilities as follows:

December 31 (dollars in millions)	2011			2010
Current deferred income tax assets	$	24.6		$	27.3
Long-term deferred income tax (liabilities) assets		(3.1	)		89.7
Net asset	$	21.5		$	117.0

A reconciliation of the beginning and ending amounts of tax loss carryovers, credit carryovers and valuation allowances follows:

December 31 (dollars in millions)

	Net Operating Losses and Tax Credits					Valuation Allowances
	2011			2010		2011			2010
Beginning balance	$	16.0		$	14.1	$	1.9		$	1.5
Additions		10.3			1.9		6.6			0.4
Reductions		(9.3	)		-		(0.1	)		-
Ending balance	$	17.0		$	16.0	$	8.4		$	1.9

The company has foreign net operating loss carryovers that expire in 2014 through 2019, an alternative minimum tax credit carryover that does not expire, a foreign tax credit carryover that expires in 2021, and state and local net operating loss carryovers that expire between 2012 and 2030.

A reconciliation of the beginning and ending amount of unrecognized benefits is as follows:

(Dollars in millions)	2011			2010
Balance at January 1	$	2.0		$	3.8
Additions based on tax positions related to the current year		-			0.1
Reductions for tax positions of prior years		(0.2	)		(1.9	)
Balance at December 31	$	1.8		$	2.0

The amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate is $1.3 million. The company recognizes potential interest and penalties related to unrecognized tax benefits as a component of tax expense. At December 31, 2011 there was $0.5 million of interest and penalties accrued. There was no net change to the interest and penalty accrual during 2011. It is anticipated there will be a $0.4 million decrease in total amount of unrecognized tax benefits in the next 12 months. The company's U.S. federal income tax returns for 2008-2011 are subject to audit. The company is subject to state and local income tax audits for tax years 2000-2011. The company is subject to non-U.S. income tax examinations for years 2005-2011.

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Organization And Significant Accounting Policies (Schedule Of Effect Of Derivative Instruments On The Statement Of Earnings) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Amount of (loss) gain recognized in OCI on derivative (effective portion)	$ 0.5	$ 21.6
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	21.0	22.0
Amount of gain recognized in earnings on a derivative (ineffective portion)	0.1
Commodities Contracts [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in OCI on derivative (effective portion)	(3.0)	10.2
Commodities Contracts [Member] | Cost Of Products Sold [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	(0.1)	1.1
Commodities Contracts [Member] | Discontinued Operations [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	7.0	12.4
Amount of gain recognized in earnings on a derivative (ineffective portion)	0.1
Commodities Contracts [Member] | Gain On Sale Of EPC [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	1.8
Foreign Currency Contracts [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in OCI on derivative (effective portion)	3.5	11.5
Foreign Currency Contracts [Member] | Cost Of Products Sold [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	0.2	0.6
Foreign Currency Contracts [Member] | Discontinued Operations [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	6.9	9.0
Foreign Currency Contracts [Member] | Gain On Sale Of EPC [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	5.2
Interest Rate Swap Contract [Member]
Derivative [Line Items]
Amount of (loss) gain recognized in OCI on derivative (effective portion)		(0.1)
Interest Rate Swap Contract [Member] | Interest Expense [Member]
Derivative [Line Items]
Amount (loss) gain reclassified from Accumulated OCI into earnings (effective portion)		(1.1)
Not Designated As Hedging Instrument [Member] | Equity Collar Contract [Member] | Other Income - Net [Member]
Derivative [Line Items]
Amount of gain recognized in earnings from continuing operations on derivative	$ 17.9

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Pension And Other Post-Retirement Benefits (Tables)

12 Months Ended

Dec. 31, 2011

Schedule Of Funded Status Of Defined Benefit Pension And Post-Retirement Benefit Plans

	Pension Benefits						Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2011			2010
Accumulated Benefit Obligation (ABO) at December 31	$	895.1		$	850.3			N/A			N/A
Change in projected benefit obligations (PBO)
PBO at beginning of year	$	(862.1	)	$	(826.7	)	$	(14.9	)	$	(17.0	)
Service cost		(9.1	)		(8.6	)		(0.1	)		(0.2	)
Interest cost		(44.1	)		(46.7	)		(0.7	)		(0.8	)
Participant contributions		-			-			(0.3	)		(0.4	)
Plan amendments		(1.6	)		-			-			-
Actuarial (loss) gain including assumption changes		(52.0	)		(38.7	)		1.9			2.1
Benefits paid		60.4			58.6			1.4			1.4
Curtailment		2.0			-			-			-
PBO at end of year	$	(906.5	)	$	(862.1	)	$	(12.7	)	$	(14.9	)
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	640.8		$	594.0		$	-		$	-
Actual return on plan assets		11.3			74.8			-			-
Contribution by the company		176.9			30.6			1.1			1.0
Participant contributions		-			-			0.3			0.4
Benefits paid		(60.4	)		(58.6	)		(1.4	)		(1.4	)
Plan assets at end of year	$	768.6		$	640.8		$	-		$	-
Funded status	$	(137.9	)	$	(221.3	)	$	(12.7	)	$	(14.9	)
Amount recognized in the balance sheet
Current liabilities	$	-		$	-		$	(1.1	)	$	(1.3	)
Non-current liabilities		(137.9	)		(221.3	)		(11.6	)		(13.6	)
Net pension liability at end of year	$	(137.9	)*	$	(221.3	)*	$	(12.7	)	$	(14.9	)
Amounts recognized in Accumulated Other Comprehensive Loss Before Tax
Net actuarial loss (gain)	$	532.0		$	447.2		$	(2.8	)	$	(3.3	)
Prior service cost		(8.9	)		(12.7	)		-			-
Total recognized in accumulated other comprehensive loss	$	523.1		$	434.5		$	(2.8	)	$	(3.3	)

* In addition the company has recorded a liability for a foreign pension plan of $1.6 million and $1.6 million at December 31, 2011 and 2010, respectively and an accumulated other comprehensive loss of $2.1 million and $1.9 million at December 31, 2011 and 2010, respectively.

Schedule Of Net Periodic Benefit Cost

	Pension Benefits									Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
Net periodic benefit cost
Service cost	$	9.1		$	8.6		$	8.4		$	0.2		$	0.2		$	0.2
Interest cost		44.2			46.7			49.8			0.7			0.8			1.0
Expected return on plan assets		(70.6	)		(61.6	)		(60.8	)		-			-			-
Amortization of unrecognized:
Net actuarial loss		24.4			17.7			10.6			(0.4	)		(0.4	)		-
Prior service cost		(0.9	)		(0.9	)		0.3			-			-			-
Curtailment and other one-time charges		(1.3	)		-			-			(2.1	)		-			-
Defined-benefit plan cost		4.9			10.5			8.3		$	(1.6	)	$	0.6		$	1.2
Various U.S. defined contribution plans cost		5.6			5.8			6.5
	$	10.5	*	$	16.3	*	$	14.8	*
Other Changes in Plan Assets and Projected Benefit Obligation Recognized in Other Comprehensive Earnings
Net actuarial loss (gain)	$	109.3		$	25.4		$	34.8		$	0.2		$	(2.1	)	$	-
Amortization of net actuarial (loss) gain		(24.4	)		(17.7	)		(10.6	)		0.4			0.4			-
Prior service cost		2.8			-			(12.4	)								-
Amortization of prior service cost		0.9			0.9			(0.3	)		(0.1	)		(0.1	)		-
Total recognized in other comprehensive earnings		88.6			8.6			11.5			0.5			(1.8	)		-
Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings	$	93.5		$	19.1		$	19.8		$	(1.1	)	$	(1.2	)	$	1.2

Schedule Of Actuarial Assumptions Used To Determine Benefit Obligations

	Pension Benefits						Post-retirement Benefits
	2011			2010			2011			2010
Discount rate		4.90	%		5.35	%		4.90	%		5.35	%
Average salary increases		4.00	%		4.00	%		4.00	%		4.00	%

Schedule Of Actuarial Assumptions Used To Determine Net Periodic Benefit Cost

	Pension Benefits									Post-retirement Benefits
Years ended December 31	2011			2010			2009			2011			2010			2009
Discount rate		5.35	%		5.80	%		6.60	%		5.35	%		5.80	%		6.60	%
Expected long-term return on plan assets		8.75	%		8.75	%		8.75	%		n/a			n/a			n/a
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%

Schedule Of Health Care Cost Trend Rates

	2011			2010
Health care cost trend rate assumed for next year		10.00	%		10.00	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		5.00	%		5.00	%
Year that the rate reaches the ultimate trend rate		2016			2015

Schedule Of Weighted Asset Allocations By Asset Category

Asset Category	2011			2010
Equity securities		55	%		62	%
Debt securities		37			30
Private equity		5			6
Other		3			2
		100	%		100	%

Schedule Of Reconciliation Of The Fair Value Measurements Using Significant Unobservable Inputs

	Short Term Investments		Other Fixed Income Securities		Private Equity			Total
Balance at December 31, 2009	$	28.2	$	0.2	$	29.4		$	57.6
Actual return (loss) on plan assets:
Relating to assets still held at the reporting date		-		-		4.0			4.0
Relating to assets sold during the period		-		-		(0.1	)		(0.1	)
Purchases, sales and settlements		27.0		-		4.4			(11.1	)
Transfers in and/or out of Level 3		-		0.2		-			0.2
Balance at December 31, 2010	$	12.7	$	0.2	$	37.7		$	50.6
Actual (loss) return on plan assets:
Relating to assets still held at the reporting date		-		-		(4.4	)		(4.4	)
Relating to assets sold during the period		-		-		9.8			9.8
Purchases, sales and settlements		27.0		-		(8.4	)		18.6
Balance at December 31, 2011	$	39.7	$	0.2	$	34.7		$	74.6

Schedule Of Estimated Future Payments

Years ending December 31 (dollars in millions)	Pension Benefits	Post-retirement Benefits
2012	$      59.8	$       1.0
2013	60.1	1.0
2014	60.1	1.0
2015	60.6	0.9
2016	60.8	0.9
2017 – 2021	306.9	4.2

Fair Value Measurement 2011 [Member]

Schedule Of Fair Value Measurement Of Plan Assets

			December 31, 2011
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs  (Level 3)
Short-term investments	$	39.7	$	-	$	-	$	39.7
Equity Securities
Common stocks		267.6		267.6		-		-
Preferred stocks		-		-		-		-
Commingled equity funds		146.1		-		146.1		-
Fixed Income Securities
U.S. Treasury securities		74.8		74.8		-		-
Government agency securities		3.7		-		3.7		-
Corporate asset backed securities		0.2		-		0.2		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		1.2		-		1.2		-
Other fixed income securities		92.4		-		92.2		0.2
Commingled fixed income funds		106.6		-		106.6		-
Other types of investments
Private equity		34.7		-		-		34.7
Total fair value of plan asset investments	$	767.0	$	342.4	$	350.0	$	74.6
Non-investment plan assets		2.0
Total plan assets	$	769.0

Fair Value Measurement 2010 [Member]

Schedule Of Fair Value Measurement Of Plan Assets

			December 31, 2010
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs (Level 3)
Short-term investments	$	12.8	$	-	$	0.1	$	12.7
Equity Securities
Common stocks		279.0		279.0		-		-
Preferred stocks		0.1		0.1		-		-
Commingled equity funds		121.3		-		121.3		-
Fixed Income Securities
U.S. Treasury securities		42.2		42.2		-		-
Government agency securities		6.5		-		6.5		-
Corporate asset backed securities		3.1		-		3.1		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		2.4		-		2.4		-
Other fixed income securities		31.1		-		30.9		0.2
Commingled fixed income funds		104.1		-		104.1		-
Other types of investments
Private equity		37.7		-		-		37.7
Total fair value of plan asset investments	$	640.3	$	321.3	$	268.4	$	50.6
Non-investment plan assets		0.5
Total plan assets	$	640.8

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Stock Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			0 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Apr. 14, 2009 A.O. Smith Combined Compensation Plan [Member]	Dec. 31, 2011 A.O. Smith Combined Compensation Plan [Member]	Dec. 31, 2011 Restricted Stock And Share Units [Member]	Dec. 31, 2010 Restricted Stock And Share Units [Member]	Dec. 31, 2009 Restricted Stock And Share Units [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2009 Stock Options [Member]
Stock Based Compensation [Line Items]
Share based compensation additional stock options approved for issuance				1,875,000
Number of shares available for granting of options, restricted stock or share units					1,918,931
Total stock based compensation cost recognized	$ 5.7	$ 5.4	$ 5.1
Stock option compensation recognized	2.8	2.2	2.2
Award vesting period, in years						three	three	three	three	three	three
Options granted in 2011, 2010 and 2009, expiration period after date of grant, in years									ten years
Aggregate intrinsic value for the outstanding options	20.0
Aggregate intrinsic value for the exercisable options	18.2
Average remaining contractual life for outstanding options, in years	8
Average remaining contractual life for exercisable options, in years	7
Weighted-average fair value per option at the date of grant	$ 16.51	$ 10.19	$ 5.47
Share units granted under the plan						75,625	101,873	159,801
Value of share units at the date of issuance						3.3	2.9	3.0
Compensation expense						2.9	3.2	2.9
Total compensation expense for share units not yet recognized	$ 3.2
Weighted average period over which the expense is expected to be recognized, in months	10

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Income Taxes (Tax Effects Of Temporary Differences Of Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Employee benefits, Assets	$ 71.5	$ 95.0
Product liability and warranties, Assets	60.6	58.9
Inventories, Liabilities	3.3	3.3
Accounts receivable, Assets	9.6	7.4
Property, plant and equipment, Liabilities	35.1	29.9
Intangibles, Liabilities	29.1	28.7
Environmental, Assets	3.3	3.5
RBC stock and collar	8.5
Undistributed foreign earnings, Liabilities	56.5
Tax loss and credit carryovers, Assets	17.0	16.0
All other, Assets	0.4
All other, Liabilities		0.1
Valuation allowance, Assets	(8.4)	(1.9)
Assets	154.0	179.0
Liabilities	132.5	62.0
Net asset	$ 21.5	$ 117.0

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Property, Plant And Equipment (Tables)

12 Months Ended

Dec. 31, 2011

Property, Plant And Equipment [Abstract]

Schedule Of Property, Plant And Equipment

December 31 (dollars in millions)	2011		2010
Land	$	11.7	$	9.2
Buildings		166.8		121.8
Equipment		418.7		377.9
Software		16.8		16.0
		614.0		524.9
Less accumulated depreciation and amortization		298.7		266.5
	$	315.3	$	258.4

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Organization And Significant Accounting Policies (Schedule Of Product Warranty Liability Activity) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		0 Months Ended	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	May 05, 2011 Warranty Reserves [Member]	Jun. 30, 2011 Warranty Reserves [Member]
Balance at beginning of year	$ 112.2	$ 108.6
Lochinvar acquisition (see Note 3)	5.8
Expense	64.6	62.7
Net increase in warranty reserve due to settlement	7.5		7.5	8.2
Claims settled	(58.3)	(59.1)
Balance at end of year	$ 131.8	$ 112.2

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Goodwill And Other Intangible Assets (Schedule Of Changes In The Carrying Amount Of Goodwill) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Beginning balance	$ 323.8	$ 319.9
Acquisition of businesses	111.4	1.1
Currency translation adjustment	(1.4)	2.8
Ending balance	433.8	323.8
North America [Member]
Goodwill [Line Items]
Beginning balance	267.4	264.6
Acquisition of businesses	108.8
Currency translation adjustment	(1.3)	2.8
Ending balance	374.9	267.4
Rest Of World [Member]
Goodwill [Line Items]
Beginning balance	56.4	55.3
Acquisition of businesses	2.6	1.1
Currency translation adjustment	(0.1)
Ending balance	$ 58.9	$ 56.4

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Restructuring, Impairment, Other Charges And Settlement Income (Narrative) (Details) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	12 Months Ended		0 Months Ended		12 Months Ended
	May 05, 2011	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Mar. 26, 2009 Tower Automotive, Inc. [Member]	Oct. 11, 2005 Tower Automotive, Inc. [Member]	Dec. 31, 2009 Other Charges [Member]	Dec. 31, 2010 SWT [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Recovery of costs and damages from vendors	$ 35.5
Provision for product warranty			7.5
Gain recognized on legal settlement		11.2
Impairment charges recognized				3.3				3.3
Restructuring charges								1.8
Purchase price of facility						4.5
Proceeds from sale of facility					2.0
Loss recognized upon sale of facility				14.0	0.9
Gain on settlement of disputes				5.0				5.0
Recognized expense associated with retained liabilities of previously owned businesses							$ 0.4

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Organization And Significant Accounting Policies (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	1 Months Ended	12 Months Ended					12 Months Ended					0 Months Ended	12 Months Ended							0 Months Ended	1 Months Ended
	Aug. 22, 2011	Aug. 22, 2011	Dec. 31, 2011 segments	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Nov. 30, 2010	Dec. 31, 2011 Commodity Futures Contracts [Member]	Dec. 31, 2011 Foreign Currency Forward Contracts [Member]	Dec. 31, 2010 Foreign Currency Forward Contracts [Member]	Aug. 22, 2011 Put Option [Member]	Aug. 22, 2011 Call Option [Member]	Aug. 22, 2011 Equity Collar Contract [Member]	Dec. 31, 2011 Equity Collar Contract [Member]	Dec. 31, 2011 Buildings [Member] years	Dec. 31, 2011 Equipment [Member] years	Dec. 31, 2011 Software [Member] years	Dec. 31, 2011 Customer Relationships [Member] years	Dec. 31, 2011 Minimum [Member]	Dec. 31, 2011 Maximum [Member]	Aug. 22, 2011 EPC [Member]	Aug. 22, 2011 EPC [Member]	Dec. 31, 2011 Regal Beloit Corporation [Member]
Organization And Significant Accounting Policies [Line Items]
Number of reporting segments			2	2
Proceeds from sale of segment, shares		2.83																			2.83	2.83
Proceeds from sale of Electrical Products segment, cash received																					$ 760
Fair value of term notes			106.7	106.7
Carrying amount of term notes			97.7	97.7
Percentage of (LIFO) inventory			65.00%	65.00%	60.00%
Estimated service lives used to compute depreciation, minimum															25	3	3
Estimated service lives used to compute depreciation, maximum															50	20	7
Intangible assets estimated useful lives, minimum																		10
Intangible assets estimated useful lives, maximum																		25
Percentage of equity collar contract purchased to protect a portion of appreciation	50.00%
Price of the equity collar, per share											$ 63.29	$ 77.32
RBC share price per share																							$ 50.97
Cash dividends or stock deposits on unrealized loss on equity collar, minimum													25.0
Equity collar contract expiration period														March 2012
Amount in excess of cash deposits on unrealized losses on commodity derivatives								10.0
After-tax loss of the effective portion of the contracts				0.5	21.6			0.1
Reclassification period for effective portion of contract, in years								1
Commodity hedges outstanding, total weight of metals, in pounds								300,000
Change in foreign currency valuation from discontinued operations									3.2	0.4
Interest rate swap outstanding							25
Derivative interest rate liabilities recorded in accrued liabilities						1.0
Allowance for doubtful accounts			3.4	3.4	3.5
Advertising costs charged to operations				58.9	47.9	41.0
Amortization of total advertising costs, months																			12	24
Amortization of total advertising costs				13.1	9.2	5.7
Research and development costs				42.7	37.1	31.0
Product warranty period, lower range (in years)			1	1
Product warranty period, upper range (in years)			10	10
Excess tax deductions recognized as financing cash flows				$ 4.3	$ 0.7	$ 2.9
Percentage of stock dividend to stock holders			50.00%	50.00%

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Consolidated Statement Of Stockholders' Equity (USD $) In Millions	Class A Common Stock [Member]	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2008	$ 60.4	$ 2.3	$ (62.4)	$ 316.1	$ (89.8)		$ 436.6
Net earnings				81.3				81.3
Activity related to the spin off of SICO discontinued businesses				(32.8)
Cash dividends on stock				(11.8)
Foreign currency translation adjustments					2.9			2.9
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009					54.7			54.7
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009					(6.7)			6.7
Unrealized gain on investments less income tax provision of $0.7 in 2011
Net earnings							8.3
Comprehensive gain							12.3
Less noncontrolling interest in other comprehensive gain					(12.3)
Reverse acquisition of SICO	0.8	33.3	676.1	12.6	(179.7)	(84.3)	(449.4)
Conversion of Class A Common Stock	(21.9)	4.3	17.6
Issuance of share units			(0.1)
Stock based compensation expense			3.5
Exercise of stock options			(0.9)			4.4
Tax benefit from exercise of stock options and vesting of share units			2.9
Cash dividends on stock							(7.8)
Stock incentives and directors' compensation			0.2
Acquisition of Tianlong							19.2
Net earnings of Tianlong							(0.1)
Balance at Dec. 31, 2009	39.3	39.9	636.9	365.4	(230.9)	(79.9)	19.1	789.8
Net earnings				111.7				111.7
Cash dividends on stock				(25.0)
Foreign currency translation adjustments					7.3			7.3
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009					(0.2)			(0.2)
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009					(5.6)			5.6
Unrealized gain on investments less income tax provision of $0.7 in 2011
Less noncontrolling interest in other comprehensive gain
Conversion of Class A Common Stock	(1.9)	0.3	1.6
Issuance of share units			(3.1)
Vesting of share units			(1.6)
Stock based compensation expense			6.1
Exercise of stock options			(1.2)			4.6
Tax benefit from exercise of stock options and vesting of share units			0.7
Stock incentives and directors' compensation			3.4			0.3
Vesting of share units, net of 27,561 shares surrendered to pay taxes in 2010						0.4
Net earnings of Tianlong							(0.2)
Buy out of Tianlong			12.9				(18.9)
Balance at Dec. 31, 2010	37.4	40.2	655.7	452.1	(229.4)	(74.6)		881.4
Net earnings				305.7				305.7
Cash dividends on stock				(27.9)
Foreign currency translation adjustments					(7.2)			(7.2)
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009					(11.0)			(11.0)
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009					(54.5)			54.5
Unrealized gain on investments less income tax provision of $0.7 in 2011					1.2			1.2
Less noncontrolling interest in other comprehensive gain
Conversion of Class A Common Stock	(1.1)	0.2	0.9
Issuance of share units			(3.7)
Vesting of share units			(8.2)
Stock based compensation expense			6.7
Exercise of stock options			(7.5)			15.3
Tax benefit from exercise of stock options and vesting of share units			4.3
Stock incentives and directors' compensation			4.3			0.4
Shares repurchased						(23.5)		(23.5)
Vesting of share units, net of 27,561 shares surrendered to pay taxes in 2010						10.0
Balance at Dec. 31, 2011	$ 36.3	$ 40.4	$ 652.5	$ 729.9	$ (300.9)	$ (72.4)		$ 1,085.8

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Restructuring, Impairment, Other Charges And Settlement Income (Schedule Of Analysis Of The Company's Restructuring, Impairment And Settlement Reserve) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning	$ 1.7
Cash payments	(1.7)
Expense (Income) recognized	(11.2)	0.1
Intangible asset write-down		(3.4)
Settlement income	11.2
Settlement income		5.0
Balance, ending		1.7
Severance Costs [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning	1.1
Cash payments	(1.1)
Expense (Income) recognized		1.1
Balance, ending		1.1
Intangible Impairment [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning
Expense (Income) recognized		3.3
Intangible asset write-down		(3.3)
Settlement Income [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning
Expense (Income) recognized	(11.2)	(5.0)
Settlement income	11.2
Settlement income		5.0
Other [Member]
Restructuring, Impairment, Other Charges And Settlement Income [Line Items]
Balance, beginning	0.6
Cash payments	(0.6)
Expense (Income) recognized		0.7
Intangible asset write-down		(0.1)
Balance, ending		$ 0.6

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Ashland City, TN Facility Flood (Tables)

12 Months Ended

Dec. 31, 2010

Ashland City, TN Facility Flood [Abstract]

Schedule Of Flood Related Expense

(dollars in millions)
Repair or write off of buildings and equipment	$	36.1
Net inventory loss		16.4
Site cleanup and restoration		14.8
		67.3
Less: insurance proceeds		31.9
Total flood related expense	$	35.4

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Valuation And Qualifying Accounts

12 Months Ended

Dec. 31, 2011

Valuation And Qualifying Accounts [Abstract]

Valuation And Qualifying Accounts

A. O. SMITH CORPORATION

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

(In millions)

Years ended December 31, 2011, 2010 and 2009

Description	Balance at Beginning of Year		Charged to Costs and Expenses1		Acquisition of Businesses		Deductions2			Balance at End of Year
2011:
Valuation allowance for trade and notes receivable	$	3.5	$	0.8	$	0.3	$	(1.2	)	$	3.4
Valuation allowance for deferred tax assets		1.9		6.6		-		(0.1	)		8.4
2010:
Valuation allowance for trade and notes receivable		3.4		0.2		-		(0.1	)		3.5
Valuation allowance for deferred tax assets		1.5		0.4		-		-			1.9
2009:
Valuation allowance for trade and notes receivable		2.8		1.7		-		(1.1	)		3.4
Valuation allowance for deferred tax assets		0.5		1.0		-		-			1.5

¹ Provision based upon estimated collection.

² Uncollectible amounts/expenditures or adjustments charged against the reserve.

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Quarterly Results Of Operations

12 Months Ended

Dec. 31, 2011

Quarterly Results Of Operations [Abstract]

Quarterly Results Of Operations

18.  Quarterly Results of Operations (Unaudited)

(dollars in millions, except per share amounts)
	1st Quarter				2nd Quarter					3rd Quarter				4th Quarter
		2011		2010		2011		2010			2011		2010		2011		2010
Net sales	$	417.4	$	366.7	$	405.3	$	375.0		$	412.0	$	377.4	$	475.8	$	370.2
Gross profit		127.0		108.3		111.9		114.2			118.7		107.2		155.0		116.3
Earnings
Continuing operations		24.2		21.3		28.6		(0.9	)		26.9		16.2		31.5		20.5
Discontinued operations		16.8		9.5		21.7		17.5			155.4		15.8		0.6		11.6
Net earnings		41.0		30.8		50.3		16.6			182.3		32.0		32.1		32.1
Net loss attributable to noncontrolling interest
Continuing operations		-		0.1		-		-			-		-		-		0.1
Discontinued operations		-		-		-		-			-		-		-		-
Net earnings attributable to A. O. Smith Corporation	$	41.0	$	30.9	$	50.3	$	16.6		$	182.3	$	32.0	$	32.1	$	32.2
Basic earnings (loss) per share
Continuing operations		0.52		0.47		0.62		(0.02	)		0.58		0.35		0.68		0.45
Discontinued operations		0.37		0.21		0.47		0.38			3.36		0.35		0.01		0.25
Net		0.89		0.68		1.09		0.36			3.94		0.70		0.69		0.70
Diluted earnings (loss) per share
Continuing operations		0.52		0.46		0.62		(0.02	)		0.58		0.35		0.68		0.44
Discontinued operations		0.36		0.21		0.46		0.38			3.33		0.34		0.01		0.25
Net		0.88		0.67		1.08		0.36			3.91		0.69		0.69		0.69
Common dividends declared		0.14		0.13		0.14		0.13			0.16		0.14		0.16		0.14

Net earnings per share are computed separately for each period and, therefore, the sum of such quarterly per share amounts may differ from the total for the year.

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Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Balance at January 1	$ 2.0	$ 3.8
Additions based on tax positions related to the current year		0.1
Reductions for tax positions of prior years	(0.2)	(1.9)
Balance at December 31	$ 1.8	$ 2.0

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Discontinued Operations (Schedule Of Condensed Statement Of Earnings Of The EPC Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Discontinued Operations [Abstract]
Net sales									$ 531.8	$ 701.8	$ 616.5
Cost of products sold									415.6	544.0	510.5
Gross profit									116.2	157.8	106.0
Selling, general and administrative expenses									61.5	84.2	74.8
Restructuring and other										0.1	(1.6)
Interest expense									2.2	3.6	4.7
Other (income) expense - net									(6.0)	(0.7)	0.3
Earnings before income taxes									58.5	70.6	27.8
Provision (benefit) for income taxes									15.5	16.2	(1.3)
Net earnings	$ 0.6	$ 155.4	$ 21.7	$ 16.8	$ 11.6	$ 15.8	$ 17.5	$ 9.5	$ 43.0	$ 54.4	$ 29.1

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Components Of The Provision For Income Taxes From Continuing Operations

Years ended December 31 (dollars in millions)	2011			2010			2009
Current:
Federal	$	(28.0	)	$	(2.9	)	$	16.0
State		(5.2	)		2.4			2.9
International		4.9			14.1			12.9
Deferred:
Federal		63.3			7.0			3.2
State		11.9			0.5			(1.1	)
International		3.4			(3.8	)		(3.0	)
	$	50.3		$	17.3		$	30.9

Difference Between Provision For Income Taxes And U.S. Federal Statutory Rate

Years ended December 31	2011			2010			2009
Provision at U.S. federal statutory rate		35.0	%		35.0	%		35.0	%
State income and franchise taxes, net of federal benefit		3.2			1.6			2.9
International income tax rate differential		(4.3	)		(13.4	)		(6.2	)
Research tax credits		(0.6	)		(0.4	)		(0.7	)
State tax credits		(2.3	)		-			-
Other		0.1			0.5			2.7
		31.1	%		23.3	%		33.7	%

Components Of Earnings From Continuing Operations Before Income Taxes

Years ended December 31 (dollars in millions)	2011		2010		2009
United States	$	117.8	$	12.4	$	48.9
International		43.7		62.0		42.9
	$	161.5	$	74.4	$	91.8

Tax Effects Of Temporary Differences Of Assets And Liabilities

	2011					2010
		Assets			Liabilities		Assets			Liabilities
Employee benefits	$	71.5		$	-	$	95.0		$	-
Product liability and warranties		60.6			-		58.9			-
Inventories		-			3.3		-			3.3
Accounts receivable		9.6			-		7.4			-
Property, plant and equipment		-			35.1		-			29.9
Intangibles		-			29.1		-			28.7
Environmental		3.3			-		3.5			-
RBC stock and collar		-			8.5		-			-
Undistributed foreign earnings		-			56.5		-			-
Tax loss and credit carryovers		17.0			-		16.0			-
All other		0.4			-		-			0.1
Valuation allowance		(8.4	)		-		(1.9	)		-
	$	154.0		$	132.5	$	179.0		$	62.0
Net asset				$	21.5				$	117.0

Balance Sheet Classification Of Deferred Tax Assets And Liabilities

December 31 (dollars in millions)	2011			2010
Current deferred income tax assets	$	24.6		$	27.3
Long-term deferred income tax (liabilities) assets		(3.1	)		89.7
Net asset	$	21.5		$	117.0

Reconciliation Of Tax Loss Carryovers, Credit Carryovers And Valuation Allowances

	Net Operating Losses and Tax Credits					Valuation Allowances
	2011			2010		2011			2010
Beginning balance	$	16.0		$	14.1	$	1.9		$	1.5
Additions		10.3			1.9		6.6			0.4
Reductions		(9.3	)		-		(0.1	)		-
Ending balance	$	17.0		$	16.0	$	8.4		$	1.9

Reconciliation Of Unrecognized Tax Benefits

(Dollars in millions)	2011			2010
Balance at January 1	$	2.0		$	3.8
Additions based on tax positions related to the current year		-			0.1
Reductions for tax positions of prior years		(0.2	)		(1.9	)
Balance at December 31	$	1.8		$	2.0

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Organization And Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2011

Organization And Significant Accounting Policies [Abstract]

Organization

Organization.  A. O. Smith Corporation (A. O. Smith or the company) is a manufacturer of water heaters and boilers, serving a diverse mix of residential and commercial end markets principally in the United States with a strong and growing international presence. The company is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless, oil and electric water heaters and commercial water heating equipment. Both segments primarily serve their respective regions of the world. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing and non-condensing boilers and water system tanks. The Rest of World segment also manufactures and markets water treatment products, primarily in Asia.

On August 22, 2011, the company sold its Electrical Products (EPC) business to Regal Beloit Corporation (RBC) for approximately $760 million in cash and approximately 2.83 million shares of RBC common stock. Due to the sale, EPC has been reported separately as a discontinued operation.

Consolidation

Consolidation. The consolidated financial statements include the accounts of the company and its wholly owned subsidiaries after elimination of intercompany transactions.

On April 22, 2009, A. O. Smith Corporation (the company) closed on a merger transaction with Smith Investment Company (SICO). The merger was approved by A. O. Smith's stockholders on April 14, 2009.

The transaction between the company and SICO has been accounted for as a reverse acquisition with SICO as the accounting acquirer and the company (which is the surviving entity for legal purposes) as the accounting acquiree. As this is a common control transaction under Accounting Standards Codification (ASC) 805 Business Combinations (formerly Statement of Financial Accounting Standard (SFAS) 141(R)), the transaction is accounted for as an equity transaction under ASC 810-10 Consolidations (formerly SFAS 160). The acquisition of a noncontrolling interest does not require purchase accounting.

Furthermore, because SICO is the continuing reporting entity for accounting purposes, the reports filed by the company as the surviving corporation in the transaction will parallel the financial reporting required under Generally Accepted Accounting Principles (GAAP) and Securities and Exchange Commission (SEC) reporting rules as if SICO were the legal successor as of the date of the transaction. Accordingly, prior period financial information presented in the company's financial statements reflects the historical activity of SICO.

On January 19, 2009, SICO distributed all of its assets and liabilities other than its ownership of A. O. Smith stock. These assets and liabilities related primarily to the multicolor printing business conducted through Berlin Industries, Inc. and the commercial warehousing, trucking and packaging business conducted through Central States Distribution Service, Inc.

Except when otherwise indicated, amounts reflected in the financial statements or the notes thereto relate to the company's continuing operations.

Use Of Estimates

Use of estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the accompanying financial statements and notes. Actual results could differ from those estimates.

Fair Value Of Financial Instruments

Fair value of financial instruments. The carrying amounts of cash and cash equivalents, receivables, floating rate debt and trade payables approximated fair value as of December 31, 2011 and 2010, due to the short maturities or frequent rate resets of these instruments. The fair value of term notes with insurance companies was approximately $106.7 million as of December 31, 2011 compared with the carrying amount of $97.7 million for the same date. The fair value is estimated based on current rates offered for debt with similar maturities.

Foreign Currency Translation

Foreign currency translation. For all subsidiaries outside the U.S., with the exception of its Mexican operation and two of its Chinese non-operating companies, the company uses the local currency as the functional currency. For those operations using a functional currency other than the U.S. dollar, assets and liabilities are translated into U.S. dollars at year-end exchange rates, and revenues and expenses are translated at weighted-average exchange rates. The resulting translation adjustments are recorded as a separate component of stockholders' equity. The Mexican operation and the two Chinese non-operating companies use the U.S. dollar as the functional currency as such operations are a direct and integral component of the company's U.S. operations. Gains and losses from foreign currency transactions are included in net earnings.

Cash And Cash Equivalents

Cash and cash equivalents. The company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.

Inventory Valuation

Inventory valuation. Inventories are carried at lower of cost or market. Cost is determined on the last-in, first-out (LIFO) method for substantially all domestic inventories, which comprise 65 percent and 60 percent of the company's total inventory at December 31, 2011 and 2010, respectively. Inventories of foreign subsidiaries and supplies are determined using the first-in, first-out (FIFO) method.

Property, Plant And Equipment

Property, plant and equipment. Property, plant and equipment are stated at cost. Depreciation is computed primarily by the straight-line method. The estimated service lives used to compute depreciation are generally 25 to 50 years for buildings, three to 20 years for equipment and three to seven years for software. Maintenance and repair costs are expensed as incurred.

Goodwill And Other Intangibles

Goodwill and other intangibles. Goodwill and indefinite-lived intangible assets are not amortized but are reviewed for impairment on an annual basis. Separable intangible assets primarily comprised of customer relationships that are not deemed to have an indefinite life are amortized on a straight-line basis over their estimated useful lives which range from ten to 25 years.

Impairment Of Long-Lived And Amortizable Intangible Assets

Impairment of long-lived and amortizable intangible assets. Property, plant and equipment and intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If the sum of the expected undiscounted cash flows is less than the carrying value of the related asset or group of assets, a loss is recognized for the difference between the fair value and carrying value of the asset or group of assets. Such analyses necessarily involve significant judgment.

Derivative Instruments

Derivative instruments. ASC 815 Derivatives and Hedging (formerly SFAS 133), as amended, requires that all derivative instruments be recorded on the balance sheet at fair value and establishes criteria for designation and effectiveness of the hedging relationships. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as a part of a hedging relationship and further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, the company must designate the hedging instrument, based upon the exposure hedged, as a fair value hedge, cash flow hedge, or a hedge of a net investment in a foreign operation.

The company designates that all of its hedging instruments, except for its equity collar contract relating to RBC shares, are cash flow hedges. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income (OCI), net of tax, and is reclassified into earnings in the same line item associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. The amount by which the cumulative change in the value of the hedge more than offsets the cumulative change in the value of the hedged item (i.e., the ineffective portion) is recorded in earnings, net of tax, in the period the ineffectiveness occurs.

The company utilizes certain derivative instruments to enhance its ability to manage currency and interest rate exposures as well as raw materials price risk and equity investment volatility. Derivative instruments are entered into for periods consistent with the related underlying exposures and do not constitute positions independent of those exposures. The company does not enter into contracts for speculative purposes. The contracts are executed with major financial institutions with no credit loss anticipated for failure of the counterparties to perform.

Commodity Futures Contracts

In addition to entering into supply arrangements in the normal course of business, the company, primarily for its discontinued operation, also enters into futures contracts to fix the cost of certain raw material purchases, principally copper and aluminum, with the objective of minimizing changes in cost due to market price fluctuations. The hedging strategy for achieving this objective is to purchase commodities futures contracts on the open market of the London Metals Exchange (LME) or over the counter contracts based on the LME.

With one of its brokers, the company is required to make cash deposits on unrealized losses on commodity derivative contracts that exceed $10.0 million.

The after-tax loss of the effective portion of the contracts of $0.1 million as of December 31, 2011 was recorded in accumulated other comprehensive loss, and will be reclassified into cost of products sold in the period in which the underlying transaction is recorded in earnings. The effective portion of the contracts will be reclassified within one year. Contracts related to the company's discontinued operation that expire after the expected closing date no longer qualified for hedge accounting; therefore the change in valuation from the announcement of the sale to August 22, 2011 was minimal and was recorded in earnings from discontinued operations in the years ended December 31, 2011 and 2010, respectively. Commodity hedges outstanding at December 31, 2011 are a total of approximately 0.3 million pounds of copper.

Foreign Currency Forward Contracts

The company is exposed to foreign currency exchange risk as a result of transactions in currencies other than the functional currency of certain subsidiaries. The company utilizes foreign currency forward purchase and sale contracts to manage the volatility associated with foreign currency purchases, sales and certain intercompany transactions in the normal course of business. Principal currencies include the Canadian dollar, Mexican peso and Euro.

Gains and losses on these instruments are recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction is recorded in earnings. When the hedged item is realized, gains or losses are reclassified from accumulated other comprehensive loss to the statement of earnings. The assessment of effectiveness for forward contracts is based on changes in the forward rates. These hedges have been determined to be effective.

The majority of the amounts in accumulated other comprehensive loss for cash flow hedges is expected to be reclassified into earnings within one year and all of the hedges will be reclassified into earnings no later than December 2013. Contracts related to the company's discontinued operation that expire after the expected closing date no longer qualified for hedge accounting; therefore the change in valuation from the announcement of the sale to August 22, 2011 of $3.2 million and $0.4 million were recorded in earnings from discontinued operations in the years ended December 31, 2011 and 2010, respectively.

The following table summarizes, by currency, the contractual amounts of the company's foreign currency forward contracts:

December 31 (dollars in millions)	2011				2010
	Buy		Sell		Buy		Sell
Euro	$	16.1	$	1.2	$	-	$	2.2
Canadian dollar		-		36.6		-		35.4
Mexican peso		16.5		-		11.2		-
Total	$	32.6	$	37.8	$	11.2	$	37.6

Interest Rate Swap Agreement

The company is exposed to interest rate risk as a result of its floating rate borrowings under its revolving credit facility. The company used an interest rate swap to manage this risk. The company's one interest rate swap in the amount of $25 million expired in November 2010.

The interest rate swap was designated and accounted for as a cash flow hedge of floating rate debt. A derivative interest rate liability of $1.0 million as of December 31, 2009 was recorded in accrued liabilities. Gains and losses on this instrument were recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction was recorded in earnings. When

the hedged item was realized, gains or losses were reclassified from accumulated other comprehensive loss to the statement of earnings. The assessment of effectiveness for the interest rate swap was based on changes in floating rate interest rates. This swap was determined to be highly effective.

Equity Collar Contract

As discussed in Note 2, on August 22, 2011, the company sold EPC to RBC and received approximately 2.83 million RBC shares. The RBC share price appreciated in the first quarter of 2011 during which the company entered into an equity collar contract for 50 percent of the RBC shares to protect a portion of that appreciation. The put strike price of the equity collar is $63.29 and the call strike price of the collar is $77.32. The RBC share price on December 31, 2011 was $50.97. The collar does not qualify for hedge accounting and therefore is adjusted to fair value on a quarterly basis through earnings from continuing operations. The company is required to make cash or stock deposits on unrealized losses on the equity collar that exceed $25.0 million. The mark to market accounting for the RBC shares and hedge will continue until the equity collar contract expires in March 2012.

The impact of derivative contracts on the company's financial statements is as follows (dollars in millions):

Fair value of derivative instruments designated as hedging instruments under ASC 815 in continuing operations:

December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011			2010
Commodities contracts	Other current assets	$	-		$	0.8
	Accrued liabilities		(0.1	)		-
Foreign currency contracts	Accrued liabilities		(1.6	)		(0.5	)
	Other current assets		1.3			1.1
Total derivatives designating as hedging instruments		$	(0.4	)	$	1.4

Fair value of derivatives not designated as hedging instruments under ASC 815 in continuing operations:

December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011		2010
Equity collar contract	Investments	$	17.9	$	-
Total derivatives not designated as hedging instruments		$	17.9	$	-

The effect of derivative instruments on the Statement of Earnings for continuing and discontinued operations.

Year ended December 31,

Derivatives in ASC 815 cash flow hedging relationships	Amount of (loss) gain recognized in OCI on derivative (effective  portion)						Location of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	Amount of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)						Location of gain recognized in earnings on derivative (ineffective portion)	Amount of gain recognized in earnings on a derivative (ineffective portion)
	2011			2010				2011			2010				2011		2010
Commodities contracts	$	(3.0	)	$	10.2		Cost of products sold	$	(0.1	)	$	1.1		Cost of products sold	$	-	$	-
							Discontinued operations		7.0			12.4		Discontinued operations		0.1		-
							Gain on sale of EPC		1.8			-		N/A		-		-
Foreign currency contracts		3.5			11.5		Cost of products sold		0.2			0.6		N/A		-		-
							Discontinued operations		6.9			9.0		Discontinued operations		-		-
							Gain on sale of EPC		5.2			-		NA		-		-
Interest rate swap contract		-			(0.1	)	Interest expense		-			(1.1	)	N/A		-		-
	$	0.5		$	21.6			$	21.0		$	22.0			$	0.1	$	-

Derivatives not designated as a hedging instrument under ASC 815	Location of gain recognized in earnings from continuing operations on derivatived	Amount of gain recognized in earnings from continuing operations  on derivative
			2011		2010
Equity collar contract	Other income - net	$	17.9	$	-

Fair Value Measurements

Fair Value Measurements. The company adopted ASC 820 Fair Value Measurements and Disclosures (formerly SFAS 157) on January 1, 2008. ASC 820, among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring basis or nonrecurring basis. ASC 820 clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices in active markets; (Level 2) inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

Assets and liabilities measured at fair value are based on the market approach which are prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities.

Continuing assets measured at fair value on a recurring basis are as follows (dollars in millions):

Fair Value Measurement Using	December 31, 2011		December 31, 2010
Quoted Prices in Active Markets for Identical Assets (Level 1)	$	144.2	$	0.6
Significant Other Observable Inputs (Level 2)		17.8		0.8
Total Investments and Net Derivative Contracts	$	162.0	$	1.4

There were no changes in our valuation techniques used to measure fair values on a recurring basis as a result of adopting ASC 820.

Revenue Recognition

Revenue recognition. The company recognizes revenue upon transfer of title, which occurs upon shipment of the product to the customer except for certain export sales where transfer of title occurs when the product reaches the customer destination.

Contracts and customer purchase orders are used to determine the existence of a sales arrangement. Shipping documents are used to verify shipment. The company assesses whether the selling price is fixed or determinable based upon the payment terms associated with the transaction and whether the sales price is subject to refund or adjustment. The company assesses collectability based on the creditworthiness of the customer as determined by credit checks and analysis, as well as the customer's payment history, and does not require collateral on sales in most cases. The allowance for doubtful accounts was $3.4 million and $3.5 million at December 31, 2011 and 2010, respectively.

Accruals for customer returns for defective product are based on historical experience with similar types of sales. Accruals for rebates and incentives are based on pricing agreements and are tied to sales volume. Changes in such accruals may be required if future returns differ from historical experience or if actual sales volume differs from estimated sales volume. Rebates and incentives are recognized as a reduction of sales.

Shipping and handling costs billed to customers are included in net sales and the related costs are included in cost of products sold.

Advertising

Advertising. The majority of advertising costs are charged to operations as incurred and amounted to $58.9 million, $47.9 million and $41.0 million during 2011, 2010 and 2009, respectively. Included in total advertising costs are expenses associated with store displays and shell water units for A. O. Smith branded products in China that are amortized over 12 to 24 months which totaled $13.1 million, $9.2 million and $5.7 million during 2011, 2010 and 2009, respectively.

Research And Development

Research and development. Research and development costs are charged to operations as incurred and amounted to $42.7 million, $37.1 million and $31.0 million during 2011, 2010 and 2009, respectively.

Product Warranties

Product warranties. The company's products carry warranties that generally range from one to ten years and are based on terms that are generally accepted in the market. The company records a liability for the expected cost of warranty-related claims at the time of sale. The allocation of our warranty liability between current and long-term is based on expected warranty claims to be paid in the next year as determined by historical product failure rates.

The following table presents the company's product warranty liability activity in 2011 and 2010:

Years ended December 31 (dollars in millions)	2011			2010
Balance at beginning of year	$	112.2		$	108.6
Lochinvar acquisition (see Note 3)		5.8			-
Expense		64.6			62.7
Net increase in warranty reserve due to settlement		7.5			-
Claims settled		(58.3	)		(59.1	)
Balance at end of year	$	131.8		$	112.2

See Note 4 for discussion on the increase in warranty reserve due to settlement and the increase in warranty expense and reserve associated with component issues in Canada.

Environmental Costs

Environmental costs. The company accrues for costs associated with environmental obligations when such costs are probable and reasonably estimable. Costs of estimated future expenditures are not discounted to their present value. Recoveries of environmental costs from other parties are recorded as assets when their receipt is considered probable. The accruals are adjusted as facts and circumstances change.

Stock-Based Compensation

Stock-based compensation. The company follows ASC 718, Compensation—Stock Compensation (formerly SFAS 123(R)). Compensation cost is recognized using the straight-line method over the vesting period of the award. ASC 718 also requires the benefits of tax deductions in excess of recognized compensation cost to be reported as a financing cash flow, rather than as an operating cash flow as required under prior literature. Excess tax deductions of $4.3 million, $0.7 million and $2.9 million were recognized as financing cash flows in 2011, 2010 and 2009, respectively.

Earnings Per Share Of Common Stock

Earnings per share of common stock. The company is not required to use the two-class method of calculating earnings per share since its Class A Common Stock and Common Stock have equal dividend rights. The numerator for the calculation of basic and diluted earnings per share is net earnings. The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations:

	2011		2010		2009
Denominator for basic earnings per share - weighted-average shares outstanding		46,119,032		45,743,246		34,289,257
Effect of dilutive stock options, restricted stock and share units		455,586		419,469		187,599
Denominator for diluted earnings per share		46,574,618		46,162,715		34,476,856

On October 11, 2010, the company's board of directors declared a three-for-two stock split of the company's Class A Common Stock and Common Stock in the form of a 50 percent stock dividend to stock holders of record on October 29, 2010 and payable on November 15, 2010. Shares held in treasury by the company were not impacted by the split. All references in the financial statements to number of shares outstanding, price per share, per share amounts and stock based compensation data have been retroactively restated to reflect the split for all periods presented.

The weighted average shares presented above have been impacted by the accounting treatment of the company's transaction with SICO which closed on April 22, 2009 and is discussed in more detail earlier in Note 1 to the Notes to Consolidated Financial Statements. The primary accounting impact of the SICO transaction is in the calculation of earnings per share since the accounting rules require the use of SICO adjusted average shares outstanding rather than A. O. Smith Corporation average shares outstanding prior to the closing. The SICO average shares outstanding reflect the historical shares of SICO multiplied by their exchange ratio from the April 22, 2009 merger transaction. Subsequent to the closing, A. O. Smith Corporation average shares are used in the calculation.

Reclassifications

Reclassifications. Certain amounts from prior years have been reclassified to conform with current year presentation.

Recent Accounting Pronouncements

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Organization And Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Organization And Significant Accounting Policies [Abstract]

Summary Of Foreign Currency Forward Contracts By Currency

December 31 (dollars in millions)	2011				2010
	Buy		Sell		Buy		Sell
Euro	$	16.1	$	1.2	$	-	$	2.2
Canadian dollar		-		36.6		-		35.4
Mexican peso		16.5		-		11.2		-
Total	$	32.6	$	37.8	$	11.2	$	37.6

Schedule Of Impact Of Derivative Contracts On The Company's Financial Statements

December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011			2010
Commodities contracts	Other current assets	$	-		$	0.8
	Accrued liabilities		(0.1	)		-
Foreign currency contracts	Accrued liabilities		(1.6	)		(0.5	)
	Other current assets		1.3			1.1
Total derivatives designating as hedging instruments		$	(0.4	)	$	1.4

Fair value of derivatives not designated as hedging instruments under ASC 815 in continuing operations:

December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011		2010
Equity collar contract	Investments	$	17.9	$	-
Total derivatives not designated as hedging instruments		$	17.9	$	-

Schedule Of Effect Of Derivative Instruments On The Statement Of Earnings

Derivatives in ASC 815 cash flow hedging relationships	Amount of (loss) gain recognized in OCI on derivative (effective  portion)						Location of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	Amount of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)						Location of gain recognized in earnings on derivative (ineffective portion)	Amount of gain recognized in earnings on a derivative (ineffective portion)
	2011			2010				2011			2010				2011		2010
Commodities contracts	$	(3.0	)	$	10.2		Cost of products sold	$	(0.1	)	$	1.1		Cost of products sold	$	-	$	-
							Discontinued operations		7.0			12.4		Discontinued operations		0.1		-
							Gain on sale of EPC		1.8			-		N/A		-		-
Foreign currency contracts		3.5			11.5		Cost of products sold		0.2			0.6		N/A		-		-
							Discontinued operations		6.9			9.0		Discontinued operations		-		-
							Gain on sale of EPC		5.2			-		NA		-		-
Interest rate swap contract		-			(0.1	)	Interest expense		-			(1.1	)	N/A		-		-
	$	0.5		$	21.6			$	21.0		$	22.0			$	0.1	$	-

Derivatives not designated as a hedging instrument under ASC 815	Location of gain recognized in earnings from continuing operations on derivative	Amount of gain recognized in earnings from continuing operations  on derivative
			2011		2010
Equity collar contract	Other income - net	$	17.9	$	-

Schedule Of Assets Measured At Fair Value On A Recurring Basis

Fair Value Measurement Using	December 31, 2011		December 31, 2010
Quoted Prices in Active Markets for Identical Assets (Level 1)	$	144.2	$	0.6
Significant Other Observable Inputs (Level 2)		17.8		0.8
Total Investments and Net Derivative Contracts	$	162.0	$	1.4

Schedule Of Product Warranty Liability Activity

Years ended December 31 (dollars in millions)	2011			2010
Balance at beginning of year	$	112.2		$	108.6
Lochinvar acquisition (see Note 3)		5.8			-
Expense		64.6			62.7
Net increase in warranty reserve due to settlement		7.5			-
Claims settled		(58.3	)		(59.1	)
Balance at end of year	$	131.8		$	112.2

Schedule Of Computation Of Basic And Diluted Weighted-Average Shares Used In EPS Calculations

	2011		2010		2009
Denominator for basic earnings per share - weighted-average shares outstanding		46,119,032		45,743,246		34,289,257
Effect of dilutive stock options, restricted stock and share units		455,586		419,469		187,599
Denominator for diluted earnings per share		46,574,618		46,162,715		34,476,856

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Consolidated Statement Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Activities
Net Earnings	$ 305.7	$ 111.5	$ 89.6
Less earnings from discontinued operations		(54.4)	(29.1)
Adjustments to reconcile earnings from continuing operations to cash provided by operating activities:
Depreciation and amortization	47.0	40.8	38.3
Loss on disposal of assets	1.0	11.7	0.9
Unrealized gain on investment	(19.8)
Net changes in operating assets and liabilities, net of acquisitions:
Current assets and liabilities	8.0	(37.5)	46.8
Noncurrent assets and liabilities	(86.4)	(8.8)	(24.3)
Other			0.7
Cash Provided by Operating Activities - continuing operations	61.0	63.3	122.9
Cash (Used in) Provided by Operating Activities - discontinued operations	(2.3)	61.5	140.0
Cash Provided by Operating Activities	58.7	124.8	262.9
Investing Activities
Acquisition of businesses	(421.1)	(11.8)	(71.4)
Proceeds from sale of investments		4.6	8.9
Proceeds on sale of assets		3.0	2.0
Net cash distributed with spinoff of discontinued SICO businesses			(7.1)
Capital expenditures	(53.5)	(53.5)	(42.7)
Cash Used in Investing Activities - continuing operations	(474.6)	(57.7)	(110.3)
Cash Provided by (Used in) Investing Activities - discontinued operations	600.2	(8.8)	(6.7)
Cash Provided by (Used in) Investing Activities	125.6	(66.5)	(117.0)
Financing Activities
Long-term debt incurred	200.2	5.0
Long-term debt repaid			(91.1)
Common stock repurchase	(23.5)
Net proceeds from stock option activity	11.2	4.0	7.6
Dividends paid	(27.7)	(24.7)	(21.4)
Cash Provided by (Used in) Financing Activities - continuing operations	160.2	(15.7)	(104.9)
Cash Used in Financing Activities - discontinued operations
Cash Provided by (Used in) Financing Activities	160.2	(15.7)	(104.9)
Net increase in cash and cash equivalents	344.5	42.6	41.0
Cash and cash equivalents-beginning of year	118.9	76.3	35.3
Cash and Cash Equivalents-End of Year	$ 463.4	$ 118.9	$ 76.3

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2011

Discontinued Operations [Abstract]

Components Of The Net Assets Of EPC Discontinued Operations

(dollars in millions)	December 31, 2010
Current Assets
Trade receivables	$	110.8
Inventory		135.9
Deferred taxes		2.2
Derivative contracts asset		17.4
Other current assets		6.0
Total Current Assets		272.3
Net property, plant and equipment		148.1
Goodwill		248.4
Other intangibles		2.8
Total Assets	$	671.6
Current Liabilities
Trade payables	$	89.5
Accrued payroll and benefits		15.2
Accrued liabilities		11.1
Product warranties		4.3
Income taxes		2.5
Total Current Liabilities		122.6
Deferred taxes		77.2
Other liabilities		1.3
Total Liabilities		201.1
Total Net Assets	$	470.5

Schedule Of Condensed Statement Of Earnings Of The EPC Discontinued Operations

Years ended December 31 (dollars in millions)
	2011			2010			2009
Net sales	$	531.8		$	701.8		$	616.5
Cost of products sold		415.6			544.0			510.5
Gross profit		116.2			157.8			106.0
Selling, general and administrative expenses		61.5			84.2			74.8
Restructuring and other		-			0.1			(1.6	)
Interest expense		2.2			3.6			4.7
Other (income) expense—net		(6.0	)		(0.7	)		0.3
		58.5			70.6			27.8
Provision (benefit) for income taxes		15.5			16.2			(1.3	)
Net earnings	$	43.0		$	54.4		$	29.1

Schedule Of The Cash Flow Provided By EPC Discontinued Operations

Years ended December 31 (dollars in millions)
	2011			2010			2009
Operating Activities
Earnings	$	43.0		$	54.4		$	29.1
Adjustments to reconcile earnings to net cash provided by discontinued operating activities:
Depreciation and amortization		16.5			26.1			29.2
Gain on sale of assets		(4.8	)		(0.2	)		(2.0	)
Net changes in operating assets and liabilities
Current assets and liabilities		(56.2	)		(23.3	)		74.5
Noncurrent assets and liabilities		0.9			4.5			9.9
Other		(1.7	)		-			(0.7	)
Cash (Used in) Provided by Discontinued Operating Activities		(2.3	)		61.5			140.0
Investing Activities
Capital expenditures		(10.5	)		(14.3	)		(14.3	)
Proceeds on sale of assets		6.1			5.5			7.6
Proceeds from sale of operations		752.5			-			-
Payments associated with sale		(147.9	)		-			-
Cash Provided by (Used in) Discontinued Investing Activities		600.2			(8.8	)		(6.7	)
Cash Flow Provided by Discontinued Operations	$	597.9		$	52.7		$	133.3

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Pension And Other Post-Retirement Benefits (Schedule Of Actuarial Assumptions Used To Determine Benefit Obligations) (Details)	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Discount rate	4.90%	5.35%
Average salary increases	4.00%	4.00%
Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Discount rate	4.90%	5.35%
Average salary increases	4.00%	4.00%

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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2011

Stockholders' Equity [Abstract]

Schedule Of Accumulated Other Comprehensive Loss

December 31 (dollars in millions)	2011			2010
Cumulative foreign currency translation adjustments	$	16.5		$	23.7
Unrealized net (loss) gain on cash flow derivative instruments (net of income tax benefit (provision) of $0.1 in 2011 and $(6.9) in 2010)		(0.3	)		10.7
Pension liability (net of income tax of $204.1 in 2011 and $169.3 in 2010)		(318.3	)		(263.8	)
Unrealized net gain on investments less related income tax provision of $(0.7)		1.2			-
	$	(300.9	)	$	(229.4	)

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Organization And Significant Accounting Policies (Schedule Of Computation Of Basic And Diluted Weighted-Average Shares Used In EPS Calculations) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Organization And Significant Accounting Policies [Abstract]
Denominator for basic earnings per share - weighted-average shares outstanding	46,119,032	45,743,246	34,289,257
Effect of dilutive stock options, restricted stock and share units	455,586	419,469	187,599
Denominator for diluted earnings per share	46,574,618	46,162,715	34,476,856

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Debt And Lease Commitments (Schedule Of Future Minimum Payments Under Non-Cancelable Operating Leases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Debt And Lease Commitments [Abstract]
2012	$ 12.4
2013	8.6
2014	7.5
2015	6.5
2016	4.6
Thereafter	$ 10.9

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Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 463.4	$ 118.9
Receivables	368.4	313.3
Inventories	168.4	146.8
Deferred income taxes	24.6	27.3
Investments	162.4
Other current assets	21.5	17.4
Current assets - discontinued EPC operations		272.3
Total Current Assets	1,208.7	896.0
Net property, plant and equipment	315.3	258.4
Goodwill	433.8	323.8
Other intangibles	352.7	106.6
Other assets	38.5	36.8
Deferred income taxes		89.7
Long-term assets - discontinued EPC operations		399.3
Total Assets	2,349.0	2,110.6
Liabilities
Trade payables	302.5	263.0
Accrued payroll and benefits	41.9	37.2
Accrued liabilities	77.2	53.3
Product warranties	43.7	36.4
Income taxes	4.5	5.7
Long-term debt due within one year	18.6	18.6
Current liabilities - discontinued EPC operations	31.5	122.6
Total Current Liabilities	519.9	536.8
Long-term debt	443.0	242.4
Deferred income taxes	3.1
Product warranties	88.1	75.8
Post-retirement benefit obligation	11.6	13.6
Pension liabilities	139.5	222.9
Other liabilities	49.3	59.2
Long-term liabilities - discontinued EPC operations	8.7	78.5
Total Liabilities	1,263.2	1,229.2
Commitments and contingencies
Stockholders' Equity
Preferred Stock
Class A Common Stock (shares issued 7,250,791 and 7,481,748)	36.3	37.4
Common Stock (shares issued 40,426,119 and 40,195,162)	40.4	40.2
Capital in excess of par value	652.5	655.7
Retained earnings	729.9	452.1
Accumulated other comprehensive loss	(300.9)	(229.4)
Treasury stock at cost	(72.4)	(74.6)
Total Stockholders' Equity	1,085.8	881.4
Total Liabilities and Stockholders' Equity	$ 2,349.0	$ 2,110.6

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Operations By Segment (Tables)

12 Months Ended

Dec. 31, 2011

Operations By Segment [Abstract]

Schedule Of Operating Earnings

	Earnings									Net Sales
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
North America	$	154.0		$	91.2		$	115.8		$	1,289.5		$	1,155.4		$	1,135.9
Rest of World		42.7			42.4			33.0			455.6			368.9			256.5
Inter-segment		(0.2	)		(0.7	)		0.1			(34.6	)		(35.0	)		(17.4	)
Total segments – operating earnings	$	196.5		$	132.9		$	148.9		$	1,710.5		$	1,489.3		$	1,375.0
General corporate and research and development expenses		(25.7	)		(51.6	)		(50.3	)
Interest expense		(9.3	)		(6.9	)		(7.2	)
Earnings before income taxes		161.5			74.4			91.4
Provision for income taxes		(50.3	)		(17.3	)		(30.9	)
Earnings from continuing operations	$	111.2		$	57.1		$	60.5

Schedule Of Assets, Depreciation And Capital Expenditures By Segment

	Total Assets (December 31)						Depreciation and Amortization (Years Ended December 31)						Capital Expenditures (Years Ended December 31)
(dollars in millions)	2011		2010		2009		2011		2010		2009		2011		2010		2009
North America	$	1,319.2	$	868.3	$	826.9	$	33.9	$	30.2	$	32.2	$	31.6	$	37.8	$	26.9
Rest of World		342.4		299.7		268.5		12.4		10.0		5.6		20.5		13.8		15.1
Corporate assets		687.4		271.0		235.2		0.7		0.6		0.5		1.4		1.9		0.7
EPC discontinued operations		-		671.6		642.4		-		-		-		-		-		-
Total	$	2,349.0	$	2,110.6	$	1,973.0	$	47.0	$	40.8	$	38.3	$	53.5	$	53.5	$	42.7

Schedule Of Net Sales And Long-Lived Assets By Geographic Location

	Long-lived Assets							Net Sales
(dollars in millions)	2011		2010		2009			2011		2010		2009
United States	$	218.2	$	173.2	$	169.2	United States	$	1,094.3	$	960.4	$	959.0
China		70.7		57.1		53.3	China		382.2		304.4		222.0
Canada		20.9		22.2		22.5	Canada		160.2		160.4		150.4
Other Foreign		32.0		31.2		26.4	Other Foreign		73.8		64.1		43.6
Total	$	341.8	$	283.7	$	271.4	Total	$	1,710.5	$	1,489.3	$	1,375.0

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Income Taxes (Components Of Earnings From Continuing Operations Before Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
United States	$ 117.8	$ 12.4	$ 48.9
International	43.7	62.0	42.9
Earnings before provision for income taxes	$ 161.5	$ 74.4	$ 91.8

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Consolidated Statement Of Comprehensive Earnings (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Comprehensive Earnings (Loss) [Abstract]
Net Earnings	$ 305.7	$ 111.5	$ 89.6
Other comprehensive (loss) earnings
Foreign currency translation adjustments	(7.2)	7.3	2.9
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision) of $7.0 in 2011, $0.1 in 2010 and $(35.0) in 2009	(11.0)	(0.2)	54.7
Change in pension liability less related income tax benefit of $34.8 in 2011, $2.7 in 2010 and $4.3 in 2009	(54.5)	(5.6)	(6.7)
Unrealized gain on investments less related tax provision of $0.7 in 2011	1.2
Less comprehensive earnings attributable to noncontrolling interest			(20.6)
Reclass of accumulated comprehensive loss associated with noncontrolling interest			(179.7)
Comprehensive Earnings (Loss)	$ 234.2	$ 113.0	$ (59.8)

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Income Taxes (Components Of The Provision For Income Taxes From Continuing Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Current, Federal	$ (28.0)	$ (2.9)	$ 16.0
Current, State	(5.2)	2.4	2.9
Current, International	4.9	14.1	12.9
Deferred, Federal	63.3	7.0	3.2
Deferred, State	11.9	0.5	(1.1)
Deferred, International	3.4	(3.8)	(3.0)
Provision for income taxes	$ 50.3	$ 17.3	$ 30.9

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Acquisitions (Summary Of Preliminary Estimate Of Fair Value Of The Assets Acquired And Liabilities Assumed Due To Acquisition) (Details) (USD $) In Millions, unless otherwise specified	Aug. 26, 2011
Acquisitions [Abstract]
Current assets, net of cash acquired	$ 54.0
Property, plant and equipment	41.9
Intangible assets	258.3
Other assets	0.1
Goodwill	111.4
Total assets acquired	465.7
Current liabilities	24.3
Long-term liabilities	3.5
Total liabilities assumed	27.8
Net assets acquired	$ 437.9

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Income Taxes (Reconciliation Of Tax Loss Carryovers, Credit Carryovers And Valuation Allowances) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Net Operating Losses and Tax Credits, Beginning balance	$ 16.0	$ 14.1
Net Operating Losses and Tax Credits, Additions	10.3	1.9
Net Operating Losses and Tax Credits, Reductions	(9.3)
Net Operating Losses and Tax Credits, Ending balance	17.0	16.0
Balance at Beginning of Year	1.9	1.5
Valuation Allowances, Additions	6.6	0.4
Valuation Allowances, Reductions	(0.1)
Balance at End of Year	$ 8.4	$ 1.9

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Statement Of Cash Flows (Tables)

12 Months Ended

Dec. 31, 2011

Statement Of Cash Flows [Abstract]

Schedule Of Supplemental Cash Flow Information

Years ended December 31 (dollars in millions)	2011			2010			2009
Net change in current assets and liabilities, net of acquisitions:
Receivables	$	(28.1	)	$	(33.2	)	$	(10.5	)
Inventories		4.7			(32.0	)		17.0
Other current assets		(4.5	)		(1.5	)		(1.0	)
Trade payables		27.4			23.3			40.8
Accrued liabilities, including payroll and benefits		5.8			(0.7	)		6.4
Income taxes payable		2.7			6.6			(5.9	)
	$	8.0		$	(37.5	)	$	46.8

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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Property, Plant And Equipment [Abstract]
Land	$ 11.7	$ 9.2
Buildings	166.8	121.8
Equipment	418.7	377.9
Software	16.8	16.0
Gross, property, plant and equipment	614.0	524.9
Less accumulated depreciation and amortization	298.7	266.5
Net property, plant and equipment	$ 315.3	$ 258.4

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Pension And Other Post-Retirement Benefits

12 Months Ended

Dec. 31, 2011

Pension And Other Post-Retirement Benefits [Abstract]

Pension And Other Post-Retirement Benefits

12.    Pension and Other Post-retirement Benefits

The company provides retirement benefits for all United States employees including benefits for employees of previously owned businesses which were earned up to the date of sale. The company also has several foreign pension plans, none of which are material to the company's financial position.

The company had a defined contribution profit sharing and retirement plan covering the majority of its salaried nonunion employees which provided for annual company contributions of 35 percent to 140 percent of qualifying contributions made by participating employees. This plan was terminated on December 31, 2009 and was replaced by a plan which matches 100 percent of the first one percent of contributions made by participating employees and matches 50 percent of the next five percent of employee contributions. The new plan became effective on January 1, 2010. The company also has defined contribution plans for certain hourly employees which provide for matching company contributions.

The company also has a defined benefit plan for salaried employees and its non-union hourly workforce. In the fourth quarter of 2009, the company announced employees hired after Jan. 1, 2010, will not participate in the defined benefit plan, and benefit accruals for current salaried and non-union hourly employees will stop at the end of 2014. This change resulted in a plan curtailment and reduced the plan's liability by $12.3 million. No curtailment gain was recognized because the reduction in liability was offset by existing unrecognized losses. An additional company contribution will be made to the defined contribution plan in lieu of participation in a defined benefit plan. The company also has defined benefit and contribution plans for certain union hourly employees.

The company has unfunded defined-benefit post-retirement plans covering certain hourly and salaried employees that provide medical and life insurance benefits from retirement to age 65. Certain hourly employees retiring after January 1, 1996, are subject to a maximum annual benefit and salaried employees hired after December 31, 1993, are not eligible for post-retirement medical benefits.

Obligations and Funded Status

Pension and Post-Retirement Disclosure Information Under ASC 715

The following tables present the changes in benefit obligations, plan assets and funded status for domestic pension and post-retirement plans and the components of net periodic benefit costs.

	Pension Benefits						Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2011			2010
Accumulated Benefit Obligation (ABO) at December 31	$	895.1		$	850.3			N/A			N/A
Change in projected benefit obligations (PBO)
PBO at beginning of year	$	(862.1	)	$	(826.7	)	$	(14.9	)	$	(17.0	)
Service cost		(9.1	)		(8.6	)		(0.1	)		(0.2	)
Interest cost		(44.1	)		(46.7	)		(0.7	)		(0.8	)
Participant contributions		-			-			(0.3	)		(0.4	)
Plan amendments		(1.6	)		-			-			-
Actuarial (loss) gain including assumption changes		(52.0	)		(38.7	)		1.9			2.1
Benefits paid		60.4			58.6			1.4			1.4
Curtailment		2.0			-			-			-
PBO at end of year	$	(906.5	)	$	(862.1	)	$	(12.7	)	$	(14.9	)
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$	640.8		$	594.0		$	-		$	-
Actual return on plan assets		11.3			74.8			-			-
Contribution by the company		176.9			30.6			1.1			1.0
Participant contributions		-			-			0.3			0.4
Benefits paid		(60.4	)		(58.6	)		(1.4	)		(1.4	)
Plan assets at end of year	$	768.6		$	640.8		$	-		$	-
Funded status	$	(137.9	)	$	(221.3	)	$	(12.7	)	$	(14.9	)
Amount recognized in the balance sheet
Current liabilities	$	-		$	-		$	(1.1	)	$	(1.3	)
Non-current liabilities		(137.9	)		(221.3	)		(11.6	)		(13.6	)
Net pension liability at end of year	$	(137.9	)*	$	(221.3	)*	$	(12.7	)	$	(14.9	)
Amounts recognized in Accumulated Other Comprehensive Loss Before Tax
Net actuarial loss (gain)	$	532.0		$	447.2		$	(2.8	)	$	(3.3	)
Prior service cost		(8.9	)		(12.7	)		-			-
Total recognized in accumulated other comprehensive loss	$	523.1		$	434.5		$	(2.8	)	$	(3.3	)

* In addition the company has recorded a liability for a foreign pension plan of $1.6 million and $1.6 million at December 31, 2011 and 2010, respectively and an accumulated other comprehensive loss of $2.1 million and $1.9 million at December 31, 2011 and 2010, respectively.

	Pension Benefits									Post-retirement Benefits
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
Net periodic benefit cost
Service cost	$	9.1		$	8.6		$	8.4		$	0.2		$	0.2		$	0.2
Interest cost		44.2			46.7			49.8			0.7			0.8			1.0
Expected return on plan assets		(70.6	)		(61.6	)		(60.8	)		-			-			-
Amortization of unrecognized:
Net actuarial loss		24.4			17.7			10.6			(0.4	)		(0.4	)		-
Prior service cost		(0.9	)		(0.9	)		0.3			-			-			-
Curtailment and other one-time charges		(1.3	)		-			-			(2.1	)		-			-
Defined-benefit plan cost		4.9			10.5			8.3		$	(1.6	)	$	0.6		$	1.2
Various U.S. defined contribution plans cost		5.6			5.8			6.5
	$	10.5	*	$	16.3	*	$	14.8	*
Other Changes in Plan Assets and Projected Benefit Obligation Recognized in Other Comprehensive Earnings
Net actuarial loss (gain)	$	109.3		$	25.4		$	34.8		$	0.2		$	(2.1	)	$	-
Amortization of net actuarial (loss) gain		(24.4	)		(17.7	)		(10.6	)		0.4			0.4			-
Prior service cost		2.8			-			(12.4	)								-
Amortization of prior service cost		0.9			0.9			(0.3	)		(0.1	)		(0.1	)		-
Total recognized in other comprehensive earnings		88.6			8.6			11.5			0.5			(1.8	)		-
Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings	$	93.5		$	19.1		$	19.8		$	(1.1	)	$	(1.2	)	$	1.2

The estimated net actuarial loss and prior service cost for the pension plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2012 are $31.8 million and $(0.9) million, respectively. The estimated net actuarial loss and prior year service cost for the post-retirement benefit plans that will be amortized from accumulated other comprehensive loss into net periodic benefit cost during 2012 are each less than $0.3 million. As permitted under ASC 715, (formerly SFAS 87 and paragraph 53 of SFAS 106), the amortization of any prior service cost is determined using a straight-line amortization of the cost over the average remaining service period of employees expected to receive benefits under the plan.

The 2011 and 2010 after tax adjustments for additional minimum pension liability resulted in other comprehensive loss of $54.5 million and $5.6 million, respectively.

* Includes $(1.6) million, $0 million and $0.5 million of defined benefit plan (expense) income and $0.9 million, $1.2 million and $1.7 million of defined contribution plans expense that were included in earnings from discontinued operations for 2011, 2010 and 2009, respectively.

Assumptions

Actuarial assumptions used to determine benefit obligations at December 31 are as follows:

	Pension Benefits						Post-retirement Benefits
	2011			2010			2011			2010
Discount rate		4.90	%		5.35	%		4.90	%		5.35	%
Average salary increases		4.00	%		4.00	%		4.00	%		4.00	%

Actuarial assumptions used to determine net periodic benefit cost for the year ended December 31 are as follows:

	Pension Benefits									Post-retirement Benefits
Years ended December 31	2011			2010			2009			2011			2010			2009
Discount rate		5.35	%		5.80	%		6.60	%		5.35	%		5.80	%		6.60	%
Expected long-term return on plan assets		8.75	%		8.75	%		8.75	%		n/a			n/a			n/a
Rate of compensation increase		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%		4.00	%

In developing the expected long-term rate of return assumption, the company evaluated its pension plan's target and actual asset allocation and expected long-term rates of return of equity and bond indices. The company also considered its pension plan's historical ten-year and 25-year compounded annualized returns of 5.5 percent and 9.2 percent, respectively.

Assumed health care cost trend rates

Assumed health care cost trend rates as of December 31 are as follows:

	2011			2010
Health care cost trend rate assumed for next year		10.00	%		10.00	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		5.00	%		5.00	%
Year that the rate reaches the ultimate trend rate		2016			2015

A one-percentage-point change in the assumed health care cost trend rates would not result in a material impact on the company's consolidated financial statements.

Plan Assets

The company's pension plan weighted asset allocations as of December 31 by asset category are as follows:

Asset Category	2011			2010
Equity securities		55	%		62	%
Debt securities		37			30
Private equity		5			6
Other		3			2
		100	%		100	%

The following tables present the fair value measurement of the company's plan assets as of December 31, 2011 and 2010 (dollars in millions)

			December 31, 2011
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs  (Level 3)
Short-term investments	$	39.7	$	-	$	-	$	39.7
Equity Securities
Common stocks		267.6		267.6		-		-
Preferred stocks		-		-		-		-
Commingled equity funds		146.1		-		146.1		-
Fixed Income Securities
U.S. Treasury securities		74.8		74.8		-		-
Government agency securities		3.7		-		3.7		-
Corporate asset backed securities		0.2		-		0.2		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		1.2		-		1.2		-
Other fixed income securities		92.4		-		92.2		0.2
Commingled fixed income funds		106.6		-		106.6		-
Other types of investments
Private equity		34.7		-		-		34.7
Total fair value of plan asset investments	$	767.0	$	342.4	$	350.0	$	74.6
Non-investment plan assets		2.0
Total plan assets	$	769.0

			December 31, 2010
Asset Category	Total		Quoted Prices in Active Markets for Identical Contracts (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Nonobservable Inputs (Level 3)
Short-term investments	$	12.8	$	-	$	0.1	$	12.7
Equity Securities
Common stocks		279.0		279.0		-		-
Preferred stocks		0.1		0.1		-		-
Commingled equity funds		121.3		-		121.3		-
Fixed Income Securities
U.S. Treasury securities		42.2		42.2		-		-
Government agency securities		6.5		-		6.5		-
Corporate asset backed securities		3.1		-		3.1		-
Corporate collateralized mortgage backed securities and collateralized mortgage obligations		2.4		-		2.4		-
Other fixed income securities		31.1		-		30.9		0.2
Commingled fixed income funds		104.1		-		104.1		-
Other types of investments
Private equity		37.7		-		-		37.7
Total fair value of plan asset investments	$	640.3	$	321.3	$	268.4	$	50.6
Non-investment plan assets		0.5
Total plan assets	$	640.8

The following table presents a reconciliation of the fair value measurements using significant unobservable inputs (Level 3) as of December 31, 2011 and 2010 (dollars in millions):

	Short Term Investments		Other Fixed Income Securities		Private Equity			Total
Balance at December 31, 2009	$	28.2	$	0.2	$	29.4		$	57.6
Actual return (loss) on plan assets:
Relating to assets still held at the reporting date		-		-		4.0			4.0
Relating to assets sold during the period		-		-		(0.1	)		(0.1	)
Purchases, sales and settlements		27.0		-		4.4			(11.1	)
Transfers in and/or out of Level 3		-		0.2		-			0.2
Balance at December 31, 2010	$	12.7	$	0.2	$	37.7		$	50.6
Actual (loss) return on plan assets:
Relating to assets still held at the reporting date		-		-		(4.4	)		(4.4	)
Relating to assets sold during the period		-		-		9.8			9.8
Purchases, sales and settlements		27.0		-		(8.4	)		18.6
Balance at December 31, 2011	$	39.7	$	0.2	$	34.7		$	74.6

The company's investment policies employ an approach whereby a diversified blend of equity and bond investments is used to maximize the long-term return of plan assets for a prudent level of risk. Equity investments are diversified across domestic and non-domestic stocks, as well as growth, value, and small to large capitalizations. Bond investments include corporate and government issues, with short-, mid- and long-term maturities, with a focus on investment grade when purchased. The company's current allocation to equity managers is between 50 to 60 percent with the remainder allocated primarily to bonds and a small allocation to private equity managers and cash. Investment and market risks are measured and monitored on an ongoing basis through regular investment portfolio reviews, annual liability measurements and periodic asset/liability studies.

The company's actual asset allocations are in line with target allocations. The company regularly reviews its actual asset allocation and periodically rebalances its investments to the targeted allocation when considered appropriate.

There were 48,590 shares of the company's Class A Common Stock and 9,388 shares of Common Stock included in plan assets at December 31, 2011. The total market value of these shares at December 31, 2011 is $2.3 million.

Cash Flows

In 2011, the company made contributions of $175.0 million and is not required to make a contribution in 2012.

Estimated Future Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid:

Years ending December 31 (dollars in millions)	Pension Benefits	Post-retirement Benefits
2012	$      59.8	$       1.0
2013	60.1	1.0
2014	60.1	1.0
2015	60.6	0.9
2016	60.8	0.9
2017 – 2021	306.9	4.2

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Inventories (Tables)

12 Months Ended

Dec. 31, 2011

Inventories [Abstract]

Schedule Of Inventories

December 31 (dollars in millions)	2011		2010
Finished products	$	85.6	$	72.7
Work in process		10.6		14.4
Raw materials		98.9		82.7
Inventories, at FIFO cost		195.1		169.8
LIFO reserve		26.7		23.0
	$	168.4	$	146.8

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Income Taxes (Balance Sheet Classification Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Current deferred income tax assets	$ 24.6	$ 27.3
Long-term deferred income tax (liabilities) assets	(3.1)	89.7
Net asset	$ 21.5	$ 117.0

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Ashland City, TN Facility Flood

12 Months Ended

Dec. 31, 2011

Ashland City, TN Facility Flood [Abstract]

Ashland City, TN Facility Flood

14. Ashland City, TN Facility Flood

Starting May 3, 2010, production at the company's largest water heater manufacturing plant located in Ashland City, TN was temporarily shut down due to flooding of the Cumberland River. Water heater production was shifted to other company plants located in the United States, Canada and Mexico. The company resumed production at the Ashland City, TN plant in June 2010. Impact from the flood was essentially completed by year end 2010.

As of December 31, 2010, the company recorded flood related expense of $35.4 million, net of insurance proceeds, consisting of the following:

(dollars in millions)
Repair or write off of buildings and equipment	$	36.1
Net inventory loss		16.4
Site cleanup and restoration		14.8
		67.3
Less: insurance proceeds		31.9
Total flood related expense	$	35.4

The buildings and equipment of the Ashland City, TN plant sustained damages due to the flooding. As of December 31, 2010, restoration of manufacturing equipment was complete and office space was nearing completion. The carrying value of fixed assets destroyed in the flood was written off, totaling $14.0 million. An additional $22.1 million was expensed to repair and refurbish damaged equipment to pre-flood condition.

The net inventory loss, totaling $16.4 million, included the cost of raw materials, work-in-process and finished good inventories that were not able to be used or sold due to flood damage.

Site cleanup and restoration began as soon as the flood waters subsided. The company engaged outside contractors to pump out water and clean and sanitize the facilities and the grounds of the manufacturing facility prior to access by company personnel. Employees normally engaged in the production of water heaters were utilized in the cleanup and repair of the facility and equipment, assessment and recovery of inventories and other aspects of the site restoration. Internal and external costs associated with site restoration and cleanup totaled $14.8 million.

Insurance proceeds

In 2010, the company maintained property damage and business interruption insurance coverage applicable to its Ashland City, TN plant totaling $30 million. The company also had federal flood insurance policies and $1.9 million was recovered. As of December 31, 2010 the company had received insurance proceeds of $31.9 million.

Government Assistance

In addition, the company received assistance from the State of Tennessee as well as local governmental agencies as incentive to reinvest in the Ashland City facility. Those incentives were in the form of grants, future tax credits and the purchase of certain property. The benefits, collectively, totaled approximately $7 million in 2010, of which $1.4 million of income was recorded in cost of goods sold in the third quarter of 2010. In the fourth quarter of 2010, $5.6 million was recorded including $1.3 million in cost of goods sold, $2.3 million in other income and $2.0 million as an offset to direct flood related expenses.

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Goodwill And Other Intangible Assets (Schedule Of Carrying Amount Of Other Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable intangible assets	$ 237.8	$ 85.1
Accumulated Amortization, Amortizable intangible assets	(31.0)	(21.4)
Net, Amortizable intangible assets	206.8	63.7
Gross Carrying Amount, Total intangible assets	383.7	128.0
Accumulated amortization, Total intangible assets	(31.0)	(21.4)
Net, Total intangible assets	352.7	106.6
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable intangible assets	6.8	6.6
Accumulated Amortization, Amortizable intangible assets	(3.6)	(2.8)
Net, Amortizable intangible assets	3.2	3.8
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Amortizable intangible assets	231.0	78.6
Accumulated Amortization, Amortizable intangible assets	(27.4)	(18.6)
Net, Amortizable intangible assets	203.6	60.0
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, indefinite-lived intangible assets	145.9	42.9
Net, Indefinite-lived intangible assets	$ 145.9	$ 42.9

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Consolidated Statement Of Comprehensive Earnings (Loss) (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Comprehensive Earnings (Loss) [Abstract]
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision)	$ 7.0	$ 0.1	$ (35.0)
Change in pension liability, related income tax benefit	34.8	2.7	4.3
Unrealized gain on investments, related tax provision	$ 0.7

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Consolidated Balance Sheets (Parenthetical)	Dec. 31, 2011	Dec. 31, 2010
Consolidated Balance Sheets [Abstract]
Class A Common Stock, shares issued	7,250,791	7,481,748
Common Stock, shares issued	40,426,119	40,195,162

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Property, Plant And Equipment

12 Months Ended

Dec. 31, 2011

Property, Plant And Equipment [Abstract]

Property, Plant And Equipment

7. Property, Plant and Equipment

December 31 (dollars in millions)	2011		2010
Land	$	11.7	$	9.2
Buildings		166.8		121.8
Equipment		418.7		377.9
Software		16.8		16.0
		614.0		524.9
Less accumulated depreciation and amortization		298.7		266.5
	$	315.3	$	258.4

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Operations By Segment (Schedule Of Operating Earnings) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Net Sales	$ 475.8	$ 412.0	$ 405.3	$ 417.4	$ 370.2	$ 377.4	$ 375.0	$ 366.7	$ 1,710.5	$ 1,489.3	$ 1,375.0
Earnings									196.5	132.9	148.9
General corporate and research and development expenses									(25.7)	(51.6)	(50.3)
Interest expense									(9.3)	(6.9)	(7.2)
Earnings before income taxes									161.5	74.4	91.4
Provision for income taxes									(50.3)	(17.3)	(30.9)
Earnings from continuing operations	31.5	26.9	28.6	24.2	20.5	16.2	(0.9)	21.3	111.2	57.1	60.5
North America [Member]
Segment Reporting Information [Line Items]
Net Sales									1,289.5	1,155.4	1,135.9
Earnings									154.0	91.2	115.8
Rest Of World [Member]
Segment Reporting Information [Line Items]
Net Sales									455.6	368.9	256.5
Earnings									42.7	42.4	33.0
Inter-Segment [Member]
Segment Reporting Information [Line Items]
Net Sales									(34.6)	(35.0)	(17.4)
Earnings									$ (0.2)	$ (0.7)	$ 0.1

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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Line Items]
Total taxes paid	$ 117.2	$ 12.3	$ 5.6
Undistributed earnings of foreign subsidiaries	633.9
Tax provision of foreign earnings recorded in discontinued operations	56.5
Undistributed foreign earnings reinvested	377.8
Cash and cash equivalents were held by foreign subsidiaries	463.3
Income tax provision or benefits made on foreign currency translation gains or losses	0
Charitable contribution carryover, valuation allowance	0
Unrecognized tax benefits that would affect the effective tax rate, if recognized	1.3
Interest and penalties accrued	0.5
Anticipated decrease in unrecognized tax benefits	$ 0.4
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryovers, expiration date	2014 through 2019
Tax credit carryovers, expiration date	2021
Income tax years under audit	2005-2011
State And Local [Member]
Income Taxes [Line Items]
Tax credit carryovers, expiration date	2012 and 2030
Income tax years under audit	2000-2011

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Ashland City, TN Facility Flood (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended			3 Months Ended
	Dec. 31, 2010	Dec. 31, 2010	Dec. 31, 2010 Ashland City, TN Plant Business Interruption Insurance [Member]	Dec. 31, 2010 Federal Flood Insurance Policies [Member]	Dec. 31, 2010 Cost Of Goods Sold [Member]	Sep. 30, 2010 Cost Of Goods Sold [Member]	Dec. 31, 2010 Other Income - Net [Member]	Dec. 31, 2010 Flood Related Expenses [Member]
Extraordinary Item [Line Items]
Flood related expense		$ 35.4
Carrying Value of fixed assets destroyed		14.0
Expense to repair and refurbish damaged equipment to pre-flood condition		22.1
Net inventory loss		16.4
Insurance proceeds		31.9	30.0
Site cleanup and restoration		14.8
Government assistance	5.6	7.0			1.3	1.4	2.3	2.0
Insurance policies recovered				$ 1.9

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Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2011	Jan. 31, 2012 Common Stock [Member]	Jun. 30, 2011 Common Stock [Member]	Jan. 31, 2012 Class A Common Stock [Member]	Jun. 30, 2011 Class A Common Stock [Member]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011
Entity Registrant Name	SMITH A O CORP
Entity Central Index Key	0000091142
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		39,266,453		6,679,997
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 1,586,129,826		$ 37,497,159
Entity Current Reporting Status	Yes

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Goodwill And Other Intangible Assets

12 Months Ended

Dec. 31, 2011

Goodwill And Other Intangible Assets [Abstract]

Goodwill And Other Intangible Assets

8.    Goodwill and Other Intangible Assets

Changes in the carrying amount of goodwill during the years ended December 31, 2011 and 2010, consisted of the following:

(dollars in millions)	North America			Rest of World			Total
Balance at December 31, 2009	$	264.6		$	55.3		$	319.9
Acquisition of businesses (see Note 3)		-			1.1			1.1
Currency translation adjustment		2.8			-			2.8
Balance at December 31, 2010		267.4			56.4			323.8
Acquisition of businesses (see Note 3)		108.8			2.6			111.4
Currency translation adjustment		(1.3	)		(0.1	)		(1.4	)
Balance at December 31, 2011	$	374.9		$	58.9		$	433.8

The carrying amount of other intangible assets consisted of the following:

	2011							2010
December 31 (dollars in millions)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Amortizable intangible assets
Patents	$	6.8	$	(3.6	)	$	3.2	$	6.6	$	(2.8	)	$	3.8
Customer lists		231.0		(27.4	)		203.6		78.6		(18.6	)		60.0
Total amortizable intangible assets		237.8		(31.0	)		206.8		85.1		(21.4	)		63.7
Indefinite-lived intangible assets
Trade names		145.9		-			145.9		42.9		-			42.9
Total intangible assets	$	383.7	$	(31.0	)	$	352.7	$	128.0	$	(21.4	)	$	106.6

Amortization of other intangible assets of $9.6 million, $7.1 million, and $3.9 million was recorded in 2011, 2010 and 2009, respectively. In the future, amortization should approximate $14.7 million annually and the intangible assets will be amortized over a weighted average period of 17 years.

As a result of the sale of EPC and change in management reporting, the company reconsidered its segment reporting in the fourth quarter of 2011. These changes did not have a significant impact on how the company evaluates goodwill or other intangible assets for impairment. The company concluded that no goodwill impairment existed at the time of the annual impairment tests which were performed in the fourth quarters of 2011, 2010 and 2009. In 2010, the company recognized an intangible asset impairment charge related to SWT of $3.3 million (see Note 4). No impairments of other intangible assets were recorded in 2011 and 2009.

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Pension And Other Post-Retirement Benefits (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension And Other Post-Retirement Benefits [Line Items]
Percentage match of the first one percent of contributions made by participating employees		100.00%
Percentage match of the next five percent of contributions made by participating employees		50.00%
Defined benefit plan curtailments		$ 12.3
Gain on curtailments		0
Medical and life insurance maximum participant coverage age, in years	65
Other comprehensive loss as a result of after tax adjustments for additional minimum pension liability	54.5	5.6	6.7
Defined benefit plan (expense) income associated with discontinued operations	(1.6)	0	0.5
Defined benefit plan expense associated with discontinued operations	0.9	1.2	1.7
Target allocation to equity managers, approximately	50.00%
Target allocation to equity managers maximum	60.00%
Common stock included in plan assets	9,388
Total market value of common stock included in plan assets	2.3
Contributions made by company	175.0
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Estimated net actuarial loss that will be amortized from accumulated other comprehensive loss into net periodic benefit cost	31.8
Estimated net prior service cost that will be amortized from accumulated other comprehensive loss into net periodic benefit cost	(0.9)
Foreign Pension Plans [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Pension plans accumulated comprehensive loss	2.1	1.9
Liability on foreign pension plan	1.6	1.6
Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Estimated net actuarial loss that will be amortized from accumulated other comprehensive loss into net periodic benefit cost	0.3
Estimated net prior service cost that will be amortized from accumulated other comprehensive loss into net periodic benefit cost	$ 0.3
10 Year Pension Plan [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Number of historical years for which compounded annualized returns is considered	10
Compounded annualized return of pension plan	5.50%
25 Year Pension Plan [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Number of historical years for which compounded annualized returns is considered	25
Compounded annualized return of pension plan	9.20%
Class A Common Stock [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Common stock included in plan assets	48,590
Minimum [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Percentage contributions by employer of qualifying contributions			35.00%
Maximum [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Percentage contributions by employer of qualifying contributions			140.00%

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Investment In RBC Shares (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Aug. 22, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Investment In RBC Shares [Abstract]
Proceeds from sale of business segment, shares	2.83
Value of shares from sale of business segment		$ 144.4
Unrealized after-tax gain on available for sale securities		1.2
Unrealized pretax gain on trading securities		1.2
Unrealized pretax gain on trading securities		$ 1.9

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Consolidated Statement Of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Continuing Operations
Net sales	$ 1,710.5	$ 1,489.3	$ 1,375.0
Cost of products sold	1,197.9	1,043.3	980.1
Gross profit	512.6	446.0	394.9
Selling, general and administrative expenses	372.8	328.7	291.8
Flood related expense		35.4
Restructuring, impairment and settlement (income) expense - net	(11.2)	0.1	1.3
Interest expense	9.3	6.9	7.2
Other (income) expense - net	(19.8)	0.5	2.8
Earnings before provision for income taxes	161.5	74.4	91.8
Provision for income taxes	50.3	17.3	30.9
Earnings before equity loss in joint venture and discontinued operations	111.2	57.1	60.9
Equity loss in joint venture			(0.4)
Earnings from Continuing Operations	111.2	57.1	60.5
Discontinued Operations
Earnings from discontinued operations, less tax provision (benefit) for income taxes of $15.5 in 2011, $16.2 in 2010 and $(1.3) in 2009	43.0	54.4	29.1
Gain on sale of discontinued EPC operations, less tax provision of $145.6	151.5
Net Earnings	305.7	111.5	89.6
Net loss (earnings) attributable to noncontrolling interest:
Continuing operations		0.2	(9.6)
Discontinued operations			1.3
Net earnings attributable to A. O. Smith Corporation	$ 305.7	$ 111.7	$ 81.3
Net Earnings Per Share of Common Stock
Continuing Operations	$ 2.41	$ 1.25	$ 1.48
Discontinued Operations	$ 4.22	$ 1.19	$ 0.89
Net Earnings attributable to A. O. Smith Corporation	$ 6.63	$ 2.44	$ 2.37
Diluted Net Earnings Per Share of Common Stock
Continuing Operations	$ 2.39	$ 1.24	$ 1.48
Discontinued Operations	$ 4.18	$ 1.18	$ 0.88
Net Earnings attributable to A. O. Smith Corporation	$ 6.57	$ 2.42	$ 2.36

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Discontinued Operations

12 Months Ended

Dec. 31, 2011

Discontinued Operations [Abstract]

Discontinued Operations

2.    Discontinued Operations

On August 22, 2011, the company completed the sale of EPC to RBC for $759.9 million in cash and approximately 2.83 million of RBC shares. Included in the $759.9 million of cash is a final working capital adjustment of $7.4 million which is recorded as a receivable from RBC. The value of the RBC shares on the date of the closing of the sale was $140.6 million. See Note 13 for further discussion regarding the company's investment in RBC stock. The company has paid $126.5 million in income taxes and $21.4 million in commissions and other sale related payments as of December 31, 2011 and estimates it will pay $34.2 million in income taxes in 2012.

Included in the gain on sale of EPC was an additional income tax accrual of $56.5 million due to the company's assertion that certain foreign earnings derived from the sale of EPC were not considered permanently reinvested by the company. The accrual is included in long term deferred income taxes in continuing operations. Also included in the gain on sale is a $10.9 million gain related to cumulative translation adjustments associated with EPC's foreign subsidiaries.

The results of EPC including all prior years have been reported separately as discontinued operations.

The components of the net assets of EPC discontinued operations were:

(dollars in millions)	December 31, 2010
Current Assets
Trade receivables	$	110.8
Inventory		135.9
Deferred taxes		2.2
Derivative contracts asset		17.4
Other current assets		6.0
Total Current Assets		272.3
Net property, plant and equipment		148.1
Goodwill		248.4
Other intangibles		2.8
Total Assets	$	671.6
Current Liabilities
Trade payables	$	89.5
Accrued payroll and benefits		15.2
Accrued liabilities		11.1
Product warranties		4.3
Income taxes		2.5
Total Current Liabilities		122.6
Deferred taxes		77.2
Other liabilities		1.3
Total Liabilities		201.1
Total Net Assets	$	470.5

Current liabilities-net of $31.5 million and long-term liabilities-net of $8.7 million of the EPC discontinued operations at December 31, 2011 consist primarily of certain retained product liabilities, employee obligations such as workers' compensation and disability and income tax liabilities associated with EPC.

The condensed statement of earnings of the EPC discontinued operations is:

Years ended December 31 (dollars in millions)
	2011			2010			2009
Net sales	$	531.8		$	701.8		$	616.5
Cost of products sold		415.6			544.0			510.5
Gross profit		116.2			157.8			106.0
Selling, general and administrative expenses		61.5			84.2			74.8
Restructuring and other		-			0.1			(1.6	)
Interest expense		2.2			3.6			4.7
Other (income) expense—net		(6.0	)		(0.7	)		0.3
		58.5			70.6			27.8
Provision (benefit) for income taxes		15.5			16.2			(1.3	)
Net earnings	$	43.0		$	54.4		$	29.1

Consolidated interest expense not directly attributable to other operations was allocated to discontinued operations based on the ratio of EPC net assets to be sold to the sum of consolidated net assets plus consolidated debt not directly attributable to other operations.

The cash flow provided by EPC discontinued operations is as follows:

Years ended December 31 (dollars in millions)
	2011			2010			2009
Operating Activities
Earnings	$	43.0		$	54.4		$	29.1
Adjustments to reconcile earnings to net cash provided by discontinued operating activities:
Depreciation and amortization		16.5			26.1			29.2
Gain on sale of assets		(4.8	)		(0.2	)		(2.0	)
Net changes in operating assets and liabilities
Current assets and liabilities		(56.2	)		(23.3	)		74.5
Noncurrent assets and liabilities		0.9			4.5			9.9
Other		(1.7	)		-			(0.7	)
Cash (Used in) Provided by Discontinued Operating Activities		(2.3	)		61.5			140.0
Investing Activities
Capital expenditures		(10.5	)		(14.3	)		(14.3	)
Proceeds on sale of assets		6.1			5.5			7.6
Proceeds from sale of operations		752.5			-			-
Payments associated with sale		(147.9	)		-			-
Cash Provided by (Used in) Discontinued Investing Activities		600.2			(8.8	)		(6.7	)
Cash Flow Provided by Discontinued Operations	$	597.9		$	52.7		$	133.3

In the second quarter of 2011, the company sold a facility in China and recognized a gain of $4.8 million.

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Organization And Significant Accounting Policies

12 Months Ended

Dec. 31, 2011

Organization And Significant Accounting Policies [Abstract]

Organization And Significant Accounting Policies

1.    Organization and Significant Accounting Policies

Organization.  A. O. Smith Corporation (A. O. Smith or the company) is a manufacturer of water heaters and boilers, serving a diverse mix of residential and commercial end markets principally in the United States with a strong and growing international presence. The company is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless, oil and electric water heaters and commercial water heating equipment. Both segments primarily serve their respective regions of the world. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing and non-condensing boilers and water system tanks. The Rest of World segment also manufactures and markets water treatment products, primarily in Asia.

On August 22, 2011, the company sold its Electrical Products (EPC) business to Regal Beloit Corporation (RBC) for approximately $760 million in cash and approximately 2.83 million shares of RBC common stock. Due to the sale, EPC has been reported separately as a discontinued operation.

Consolidation. The consolidated financial statements include the accounts of the company and its wholly owned subsidiaries after elimination of intercompany transactions.

On April 22, 2009, A. O. Smith Corporation (the company) closed on a merger transaction with Smith Investment Company (SICO). The merger was approved by A. O. Smith's stockholders on April 14, 2009.

The transaction between the company and SICO has been accounted for as a reverse acquisition with SICO as the accounting acquirer and the company (which is the surviving entity for legal purposes) as the accounting acquiree. As this is a common control transaction under Accounting Standards Codification (ASC) 805 Business Combinations (formerly Statement of Financial Accounting Standard (SFAS) 141(R)), the transaction is accounted for as an equity transaction under ASC 810-10 Consolidations (formerly SFAS 160). The acquisition of a noncontrolling interest does not require purchase accounting.

Furthermore, because SICO is the continuing reporting entity for accounting purposes, the reports filed by the company as the surviving corporation in the transaction will parallel the financial reporting required under Generally Accepted Accounting Principles (GAAP) and Securities and Exchange Commission (SEC) reporting rules as if SICO were the legal successor as of the date of the transaction. Accordingly, prior period financial information presented in the company's financial statements reflects the historical activity of SICO.

On January 19, 2009, SICO distributed all of its assets and liabilities other than its ownership of A. O. Smith stock. These assets and liabilities related primarily to the multicolor printing business conducted through Berlin Industries, Inc. and the commercial warehousing, trucking and packaging business conducted through Central States Distribution Service, Inc.

Except when otherwise indicated, amounts reflected in the financial statements or the notes thereto relate to the company's continuing operations.

Use of estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the accompanying financial statements and notes. Actual results could differ from those estimates.

Fair value of financial instruments. The carrying amounts of cash and cash equivalents, receivables, floating rate debt and trade payables approximated fair value as of December 31, 2011 and 2010, due to the short maturities or frequent rate resets of these instruments. The fair value of term notes with insurance companies was approximately $106.7 million as of December 31, 2011 compared with the carrying amount of $97.7 million for the same date. The fair value is estimated based on current rates offered for debt with similar maturities.

Foreign currency translation. For all subsidiaries outside the U.S., with the exception of its Mexican operation and two of its Chinese non-operating companies, the company uses the local currency as the functional currency. For those operations using a functional currency other than the U.S. dollar, assets and liabilities are translated into U.S. dollars at year-end exchange rates, and revenues and expenses are translated at weighted-average exchange rates. The resulting translation adjustments are recorded as a separate component of stockholders' equity. The Mexican operation and the two Chinese non-operating companies use the U.S. dollar as the functional currency as such operations are a direct and integral component of the company's U.S. operations. Gains and losses from foreign currency transactions are included in net earnings.

Cash and cash equivalents. The company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.

Inventory valuation. Inventories are carried at lower of cost or market. Cost is determined on the last-in, first-out (LIFO) method for substantially all domestic inventories, which comprise 65 percent and 60 percent of the company's total inventory at December 31, 2011 and 2010, respectively. Inventories of foreign subsidiaries and supplies are determined using the first-in, first-out (FIFO) method.

Property, plant and equipment. Property, plant and equipment are stated at cost. Depreciation is computed primarily by the straight-line method. The estimated service lives used to compute depreciation are generally 25 to 50 years for buildings, three to 20 years for equipment and three to seven years for software. Maintenance and repair costs are expensed as incurred.

Goodwill and other intangibles. Goodwill and indefinite-lived intangible assets are not amortized but are reviewed for impairment on an annual basis. Separable intangible assets primarily comprised of customer relationships that are not deemed to have an indefinite life are amortized on a straight-line basis over their estimated useful lives which range from ten to 25 years.

Impairment of long-lived and amortizable intangible assets. Property, plant and equipment and intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. If the sum of the expected undiscounted cash flows is less than the carrying value of the related asset or group of assets, a loss is recognized for the difference between the fair value and carrying value of the asset or group of assets. Such analyses necessarily involve significant judgment.

Derivative instruments. ASC 815 Derivatives and Hedging (formerly SFAS 133), as amended, requires that all derivative instruments be recorded on the balance sheet at fair value and establishes criteria for designation and effectiveness of the hedging relationships. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as a part of a hedging relationship and further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, the company must designate the hedging instrument, based upon the exposure hedged, as a fair value hedge, cash flow hedge, or a hedge of a net investment in a foreign operation.

The company designates that all of its hedging instruments, except for its equity collar contract relating to RBC shares, are cash flow hedges. For derivative instruments that are designated and qualify as a cash flow hedge (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income (OCI), net of tax, and is reclassified into earnings in the same line item associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. The amount by which the cumulative change in the value of the hedge more than offsets the cumulative change in the value of the hedged item (i.e., the ineffective portion) is recorded in earnings, net of tax, in the period the ineffectiveness occurs.

The company utilizes certain derivative instruments to enhance its ability to manage currency and interest rate exposures as well as raw materials price risk and equity investment volatility. Derivative instruments are entered into for periods consistent with the related underlying exposures and do not constitute positions independent of those exposures. The company does not enter into contracts for speculative purposes. The contracts are executed with major financial institutions with no credit loss anticipated for failure of the counterparties to perform.

Commodity Futures Contracts

In addition to entering into supply arrangements in the normal course of business, the company, primarily for its discontinued operation, also enters into futures contracts to fix the cost of certain raw material purchases, principally copper and aluminum, with the objective of minimizing changes in cost due to market price fluctuations. The hedging strategy for achieving this objective is to purchase commodities futures contracts on the open market of the London Metals Exchange (LME) or over the counter contracts based on the LME.

With one of its brokers, the company is required to make cash deposits on unrealized losses on commodity derivative contracts that exceed $10.0 million.

The after-tax loss of the effective portion of the contracts of $0.1 million as of December 31, 2011 was recorded in accumulated other comprehensive loss, and will be reclassified into cost of products sold in the period in which the underlying transaction is recorded in earnings. The effective portion of the contracts will be reclassified within one year. Contracts related to the company's discontinued operation that expire after the expected closing date no longer qualified for hedge accounting; therefore the change in valuation from the announcement of the sale to August 22, 2011 was minimal and was recorded in earnings from discontinued operations in the years ended December 31, 2011 and 2010, respectively. Commodity hedges outstanding at December 31, 2011 are a total of approximately 0.3 million pounds of copper.

Foreign Currency Forward Contracts

The company is exposed to foreign currency exchange risk as a result of transactions in currencies other than the functional currency of certain subsidiaries. The company utilizes foreign currency forward purchase and sale contracts to manage the volatility associated with foreign currency purchases, sales and certain intercompany transactions in the normal course of business. Principal currencies include the Canadian dollar, Mexican peso and Euro.

Gains and losses on these instruments are recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction is recorded in earnings. When the hedged item is realized, gains or losses are reclassified from accumulated other comprehensive loss to the statement of earnings. The assessment of effectiveness for forward contracts is based on changes in the forward rates. These hedges have been determined to be effective.

The majority of the amounts in accumulated other comprehensive loss for cash flow hedges is expected to be reclassified into earnings within one year and all of the hedges will be reclassified into earnings no later than December 2013. Contracts related to the company's discontinued operation that expire after the expected closing date no longer qualified for hedge accounting; therefore the change in valuation from the announcement of the sale to August 22, 2011 of $3.2 million and $0.4 million were recorded in earnings from discontinued operations in the years ended December 31, 2011 and 2010, respectively.

The following table summarizes, by currency, the contractual amounts of the company's foreign currency forward contracts:

December 31 (dollars in millions)	2011				2010
	Buy		Sell		Buy		Sell
Euro	$	16.1	$	1.2	$	-	$	2.2
Canadian dollar		-		36.6		-		35.4
Mexican peso		16.5		-		11.2		-
Total	$	32.6	$	37.8	$	11.2	$	37.6

Interest Rate Swap Agreement

The company is exposed to interest rate risk as a result of its floating rate borrowings under its revolving credit facility. The company used an interest rate swap to manage this risk. The company's one interest rate swap in the amount of $25 million expired in November 2010.

The interest rate swap was designated and accounted for as a cash flow hedge of floating rate debt. A derivative interest rate liability of $1.0 million as of December 31, 2009 was recorded in accrued liabilities. Gains and losses on this instrument were recorded in accumulated other comprehensive loss, net of tax, until the underlying transaction was recorded in earnings. When

the hedged item was realized, gains or losses were reclassified from accumulated other comprehensive loss to the statement of earnings. The assessment of effectiveness for the interest rate swap was based on changes in floating rate interest rates. This swap was determined to be highly effective.

Equity Collar Contract

As discussed in Note 2, on August 22, 2011, the company sold EPC to RBC and received approximately 2.83 million RBC shares. The RBC share price appreciated in the first quarter of 2011 during which the company entered into an equity collar contract for 50 percent of the RBC shares to protect a portion of that appreciation. The put strike price of the equity collar is $63.29 and the call strike price of the collar is $77.32. The RBC share price on December 31, 2011 was $50.97. The collar does not qualify for hedge accounting and therefore is adjusted to fair value on a quarterly basis through earnings from continuing operations. The company is required to make cash or stock deposits on unrealized losses on the equity collar that exceed $25.0 million. The mark to market accounting for the RBC shares and hedge will continue until the equity collar contract expires in March 2012.

The impact of derivative contracts on the company's financial statements is as follows (dollars in millions):

Fair value of derivative instruments designated as hedging instruments under ASC 815 in continuing operations:

December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011			2010
Commodities contracts	Other current assets	$	-		$	0.8
	Accrued liabilities		(0.1	)		-
Foreign currency contracts	Accrued liabilities		(1.6	)		(0.5	)
	Other current assets		1.3			1.1
Total derivatives designating as hedging instruments		$	(0.4	)	$	1.4

Fair value of derivatives not designated as hedging instruments under ASC 815 in continuing operations:

December 31, (dollars in millions)	Balance Sheet Location	Fair Value
		2011		2010
Equity collar contract	Investments	$	17.9	$	-
Total derivatives not designated as hedging instruments		$	17.9	$	-

The effect of derivative instruments on the Statement of Earnings for continuing and discontinued operations.

Year ended December 31,

Derivatives in ASC 815 cash flow hedging relationships	Amount of (loss) gain recognized in OCI on derivative (effective  portion)						Location of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)	Amount of (loss) gain reclassified from Accumulated OCI into earnings (effective portion)						Location of gain recognized in earnings on derivative (ineffective portion)	Amount of gain recognized in earnings on a derivative (ineffective portion)
	2011			2010				2011			2010				2011		2010
Commodities contracts	$	(3.0	)	$	10.2		Cost of products sold	$	(0.1	)	$	1.1		Cost of products sold	$	-	$	-
							Discontinued operations		7.0			12.4		Discontinued operations		0.1		-
							Gain on sale of EPC		1.8			-		N/A		-		-
Foreign currency contracts		3.5			11.5		Cost of products sold		0.2			0.6		N/A		-		-
							Discontinued operations		6.9			9.0		Discontinued operations		-		-
							Gain on sale of EPC		5.2			-		NA		-		-
Interest rate swap contract		-			(0.1	)	Interest expense		-			(1.1	)	N/A		-		-
	$	0.5		$	21.6			$	21.0		$	22.0			$	0.1	$	-

Derivatives not designated as a hedging instrument under ASC 815	Location of gain recognized in earnings from continuing operations on derivative	Amount of gain recognized in earnings from continuing operations  on derivative
			2011		2010
Equity collar contract	Other income - net	$	17.9	$	-

Fair Value Measurements. The company adopted ASC 820 Fair Value Measurements and Disclosures (formerly SFAS 157) on January 1, 2008. ASC 820, among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring basis or nonrecurring basis. ASC 820 clarifies that fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. As a basis for considering such assumptions, ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: (Level 1) observable inputs such as quoted prices in active markets; (Level 2) inputs, other than the quoted prices in active markets, that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.

Assets and liabilities measured at fair value are based on the market approach which are prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities.

Continuing assets measured at fair value on a recurring basis are as follows (dollars in millions):

Fair Value Measurement Using	December 31, 2011		December 31, 2010
Quoted Prices in Active Markets for Identical Assets (Level 1)	$	144.2	$	0.6
Significant Other Observable Inputs (Level 2)		17.8		0.8
Total Investments and Net Derivative Contracts	$	162.0	$	1.4

There were no changes in our valuation techniques used to measure fair values on a recurring basis as a result of adopting ASC 820.

Revenue recognition. The company recognizes revenue upon transfer of title, which occurs upon shipment of the product to the customer except for certain export sales where transfer of title occurs when the product reaches the customer destination.

Contracts and customer purchase orders are used to determine the existence of a sales arrangement. Shipping documents are used to verify shipment. The company assesses whether the selling price is fixed or determinable based upon the payment terms associated with the transaction and whether the sales price is subject to refund or adjustment. The company assesses collectability based on the creditworthiness of the customer as determined by credit checks and analysis, as well as the customer's payment history, and does not require collateral on sales in most cases. The allowance for doubtful accounts was $3.4 million and $3.5 million at December 31, 2011 and 2010, respectively.

Accruals for customer returns for defective product are based on historical experience with similar types of sales. Accruals for rebates and incentives are based on pricing agreements and are tied to sales volume. Changes in such accruals may be required if future returns differ from historical experience or if actual sales volume differs from estimated sales volume. Rebates and incentives are recognized as a reduction of sales.

Shipping and handling costs billed to customers are included in net sales and the related costs are included in cost of products sold.

Advertising. The majority of advertising costs are charged to operations as incurred and amounted to $58.9 million, $47.9 million and $41.0 million during 2011, 2010 and 2009, respectively. Included in total advertising costs are expenses associated with store displays and shell water units for A. O. Smith branded products in China that are amortized over 12 to 24 months which totaled $13.1 million, $9.2 million and $5.7 million during 2011, 2010 and 2009, respectively.

Research and development. Research and development costs are charged to operations as incurred and amounted to $42.7 million, $37.1 million and $31.0 million during 2011, 2010 and 2009, respectively.

Product warranties. The company's products carry warranties that generally range from one to ten years and are based on terms that are generally accepted in the market. The company records a liability for the expected cost of warranty-related claims at the time of sale. The allocation of our warranty liability between current and long-term is based on expected warranty claims to be paid in the next year as determined by historical product failure rates.

The following table presents the company's product warranty liability activity in 2011 and 2010:

Years ended December 31 (dollars in millions)	2011			2010
Balance at beginning of year	$	112.2		$	108.6
Lochinvar acquisition (see Note 3)		5.8			-
Expense		64.6			62.7
Net increase in warranty reserve due to settlement		7.5			-
Claims settled		(58.3	)		(59.1	)
Balance at end of year	$	131.8		$	112.2

See Note 4 for discussion on the increase in warranty reserve due to settlement and the increase in warranty expense and reserve associated with component issues in Canada.

Environmental costs. The company accrues for costs associated with environmental obligations when such costs are probable and reasonably estimable. Costs of estimated future expenditures are not discounted to their present value. Recoveries of environmental costs from other parties are recorded as assets when their receipt is considered probable. The accruals are adjusted as facts and circumstances change.

Stock-based compensation. The company follows ASC 718, Compensation—Stock Compensation (formerly SFAS 123(R)). Compensation cost is recognized using the straight-line method over the vesting period of the award. ASC 718 also requires the benefits of tax deductions in excess of recognized compensation cost to be reported as a financing cash flow, rather than as an operating cash flow as required under prior literature. Excess tax deductions of $4.3 million, $0.7 million and $2.9 million were recognized as financing cash flows in 2011, 2010 and 2009, respectively.

Earnings per share of common stock. The company is not required to use the two-class method of calculating earnings per share since its Class A Common Stock and Common Stock have equal dividend rights. The numerator for the calculation of basic and diluted earnings per share is net earnings. The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations:

	2011		2010		2009
Denominator for basic earnings per share - weighted-average shares outstanding		46,119,032		45,743,246		34,289,257
Effect of dilutive stock options, restricted stock and share units		455,586		419,469		187,599
Denominator for diluted earnings per share		46,574,618		46,162,715		34,476,856

On October 11, 2010, the company's board of directors declared a three-for-two stock split of the company's Class A Common Stock and Common Stock in the form of a 50 percent stock dividend to stock holders of record on October 29, 2010 and payable on November 15, 2010. Shares held in treasury by the company were not impacted by the split. All references in the financial statements to number of shares outstanding, price per share, per share amounts and stock based compensation data have been retroactively restated to reflect the split for all periods presented.

The weighted average shares presented above have been impacted by the accounting treatment of the company's transaction with SICO which closed on April 22, 2009 and is discussed in more detail earlier in Note 1 to the Notes to Consolidated Financial Statements. The primary accounting impact of the SICO transaction is in the calculation of earnings per share since the accounting rules require the use of SICO adjusted average shares outstanding rather than A. O. Smith Corporation average shares outstanding prior to the closing. The SICO average shares outstanding reflect the historical shares of SICO multiplied by their exchange ratio from the April 22, 2009 merger transaction. Subsequent to the closing, A. O. Smith Corporation average shares are used in the calculation.

Reclassifications. Certain amounts from prior years have been reclassified to conform with current year presentation.

Recent Accounting Pronouncements

In June 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2011-05, "Comprehensive Income (Topic 220): Presentation of Comprehensive Income." ASU 2011-05 eliminates the option to present components of other comprehensive income as part of the statement of shareholders' equity. ASU 2011-05 will be effective for the quarter ending March 31, 2012. The adoption of this guidance will have no impact on the company's financial condition or results of operations but will impact the presentation of the financial statements. The company is currently evaluating the presentation options.

In September 2011, the FASB issued ASU 2011-08, "Testing of Goodwill for Impairment (Topic 350)". ASU 2011-08 allows companies to assess qualitative factors to determine whether the two-step quantitative goodwill impairment test needs to be performed. Under the option, an entity no longer would be required to calculate the fair value of a reporting unit unless it determines, based on that qualitative assessment, that it is more likely than not that its fair value is less than its carrying amount. The ASU may change how a company tests goodwill for impairment but should not change the timing or measurement of goodwill impairments. The ASU will be effective for the year ending December 31, 2012. The company is currently reviewing the standard for applicability.

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Investment In RBC Shares

12 Months Ended

Dec. 31, 2011

Investment In RBC Shares [Abstract]

Investment In RBC Shares

13.    Investment in RBC Shares

As discussed in Note 2, the company received approximately 2.83 million of RBC shares as a part of the proceeds of its sale of EPC to RBC. The value of those shares at December 31, 2011 was $144.4 million. One half of the RBC shares are classified as available for sale securities and are recorded at fair value with the unrealized after-tax gain of $1.2 million included in other comprehensive loss. The company entered into an equity collar contract for the remaining half of the RBC shares that are classified as trading securities. The shares are recorded at fair value with the unrealized pretax gain of $1.9 million included in earnings and classified as other (income) expense–net, in the consolidated statements of earnings. See Note 1 for further discussion regarding the collar. The shares that the company received from RBC on August 22, 2011 are restricted securities under the Securities Act of 1933, as amended (the "Securities Act"). Subject to certain conditions included in the Shareholders Agreement, the company may sell the RBC shares at prices and on terms to be determined at or prior to the time of sale pursuant to a shelf registration statement that became effective upon filing with the SEC on November 10, 2011. In addition, under Rule 144 under the Securities Act as currently in effect, a person who acquired shares of common stock from the issuer and who has beneficially owned the shares of common stock for at least six months is entitled to sell such shares of common stock without registration under the Securities Act, so long as (i) such person is not deemed to have been the issuer's affiliate at the time of, or at any time during three months preceding, the sale and (ii) the issuer has filed all required reports under Section 13 or 15(d) of the Exchange Act, as applicable, during the twelve months preceding such sale (other than current reports on Form 8-K).

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Debt And Lease Commitments

12 Months Ended

Dec. 31, 2011

Debt And Lease Commitments [Abstract]

Debt And Lease Commitments

9.    Debt and Lease Commitments

December 31 (dollars in millions)	2011		2010
Bank credit lines, average year-end interest rate of 6.8% for 2011 and 5.1% for 2010	$	6.2	$	6.5
Revolving credit agreement borrowings, average year-end interest rate of 1.8% for 2011 and 2010		330.0		115.0
Commercial paper, average year-end interest rate of 1.3% for 2011		27.7		-
Term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.9% for 2011 and 2010		68.3		86.9
Canadian revolving credit agreement borrowings, average year-end interest rate of 2.7% for 2010		-		22.6
Canadian term notes with insurance companies, expiring through 2018, average year-end interest rate of 5.3% for 2011 and 2010		29.4		30.0
		461.6		261.0
Less long-term debt due within one year		18.6		18.6
Long-term debt	$	443.0	$	242.4

The company has a $425 million multi-year multi-currency revolving credit agreement with a group of eight banks, which expires on November 13, 2013. The facility has an accordion provision which allows it to be increased up to $525 million if certain conditions (including lender approval) are satisfied. Borrowings under the company's bank credit lines and commercial paper borrowings are supported by the revolving credit agreement. As a result of the long-term nature of this facility, the commercial paper and credit line borrowings are classified as long-term debt at December 31, 2011 and 2010. At its option, the company maintains either cash balances or pays fees for bank credit and services.

Scheduled maturities of long-term debt within each of the five years subsequent to December 31, 2011, are as follows:

Years ending December 31 (dollars in millions)	Amount
2012	$	18.6
2013		382.5
2014		14.4
2015		14.4
2016		14.4

Future minimum payments under non-cancelable operating leases relating mostly to office, manufacturing and warehouse facilities total $50.5 million and are due as follows

Years ending December 31 (dollars in millions)	Amount
2012	$	12.4
2013		8.6
2014		7.5
2015		6.5
2016		4.6
Thereafter		10.9

Rent expense, including payments under operating leases, was $16.1 million, $13.9 million and $12.3 million in 2011, 2010 and 2009, respectively.

Interest paid by the company including discontinued operations was $11.5 million, $10.5 million and $11.9 million in 2011, 2010 and 2009, respectively.

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Pension And Other Post-Retirement Benefits (Schedule Of Actuarial Assumptions Used To Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Expected long-term return on plan assets	8.75%	8.75%	8.75%
Rate of compensation increase	4.00%	4.00%	4.00%
Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Rate of compensation increase	4.00%	4.00%	4.00%
Pension Benefits, Net Periodic Benefit Cost [Member] | Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Discount rate	5.35%	5.80%	6.60%
Post-Retirement Benefits, Net Periodic Benefit Cost [Member] | Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Discount rate	5.35%	5.80%	6.60%

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Statement Of Cash Flows

12 Months Ended

Dec. 31, 2011

Statement Of Cash Flows [Abstract]

Statement Of Cash Flows

5. Statement of Cash Flows

Supplemental cash flow information is as follows:

Years ended December 31 (dollars in millions)	2011			2010			2009
Net change in current assets and liabilities, net of acquisitions:
Receivables	$	(28.1	)	$	(33.2	)	$	(10.5	)
Inventories		4.7			(32.0	)		17.0
Other current assets		(4.5	)		(1.5	)		(1.0	)
Trade payables		27.4			23.3			40.8
Accrued liabilities, including payroll and benefits		5.8			(0.7	)		6.4
Income taxes payable		2.7			6.6			(5.9	)
	$	8.0		$	(37.5	)	$	46.8

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Acquisitions (Schedule Of Pro Forma Unaudited Results Of Operations Assuming Acquisition At Beginning Of Fiscal Year) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Acquisitions [Abstract]
Net sales	$ 1,835.8	$ 1,664.0
Earnings from continuing operations	$ 122.5	$ 71.5
Basic	$ 2.66	$ 1.56
Diluted	$ 2.63	$ 1.55

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Acquisitions

12 Months Ended

Dec. 31, 2011

Acquisitions [Abstract]

Acquisitions

3.    Acquisitions

On August 26, 2011, the company acquired 100 percent of the shares of Lochinvar Corporation (Lochinvar), a privately held manufacturer of high-efficiency boilers used in residential and commercial hydronic heating and hot water applications located in Lebanon, Tennessee. The addition of Lochinvar expands the company's product offerings and gives the company access to proven high-efficiency boiler technology. Lochinvar is included in the North America segment.

The company paid an aggregate cash purchase price, net of $1.5 million of cash acquired, of $421.1 million. In addition, the company incurred acquisition costs of approximately $5.5 million. Under the purchase agreement for the Lochinvar acquisition, the company agreed to make a contingent payment of up to an additional $35.0 million in cash based on the amount by which Lochinvar sales between December 1, 2011 and November 30, 2012 exceed $216.0 million. As of the acquisition date and December 31, 2011, the fair value of the contingent payment has been estimated at $16.8 million.

The following table summarizes the allocation of fair value of the assets acquired and liabilities assumed at the date of acquisition. Of the $258.3 million of acquired intangible assets, $103.5 million has been assigned to tradenames that are not subject to amortization and $152.5 million has been assigned to customer lists which are being amortized over 19 years, and the remaining $2.3 million has been assigned to non-compete agreements and patents which are being amortized over ten years.

August 26, 2011 (dollars in millions)
Current assets, net of cash acquired	$	54.0
Property, plant and equipment		41.9
Intangible assets		258.3
Other assets		0.1
Goodwill		111.4
Total assets acquired		465.7
Current liabilities		24.3
Long-term liabilities		3.5
Total liabilities assumed		27.8
Net assets acquired	$	437.9

For income tax purposes, the transaction has been accounted for as an asset purchase, resulting in the full amount of goodwill and intangible assets, totaling $369.7 million being deductible for income tax purposes.

Lochinvar's results of operations have been included in the company's financial statements from August 26, 2011, the date of acquisition. Revenues and pretax earnings associated with Lochinvar included in operations totaled $75.9 million and $5.6 million, respectively which included $13.0 million of operating earnings less $5.5 million of acquisition costs included in selling, general and administrative expense and $1.9 million of interest expense.

The following table represents the pro forma unaudited results of operations for the company for the years ended December 31, 2011 and 2010, respectively, assuming consummation of the purchase of Lochinvar as of January 1, of each year. (dollars in millions except per share data):

	Years ended December 31,
	2011		2010
Net sales	$	1,835.8	$	1,664.0
Earnings from continuing operations		122.5		71.5
Earnings per common share:
Basic	$	2.66	$	1.56
Diluted	$	2.63	$	1.55

The pro forma results have been prepared for informational purposes only and include adjustments to depreciation expense of acquired plant and equipment, amortization of intangible assets other than goodwill and tradenames, increased interest expense on acquisition related debt, and certain other adjustments, together with related income tax effects of such adjustments. These pro forma results do not purport to be indicative of the results of operations that would have occurred had the purchases been made as of the beginning of the periods presented or of the results of operations that may occur in the future.

In November 2009, the company acquired a majority interest in the water treatment business of Tianlong Holding Co. Ltd. (Tianlong) of Hong Kong, with operations based in Shanghai, China. A newly formed company, A. O. Smith (Shanghai) Water Treatment Products Co., Ltd. (SWT), holds the assets of the business, which manufactures and supplies reverse osmosis units and other water treatment products to the China residential and commercial markets as well as export markets around the world.

The company acquired an 80 percent interest in SWT at a total cost of $76.7 million, including fixed future payments of $5.7 million, subject to reductions for claims the company may make if there are any breaches of the representations and warranties made by the selling shareholder under the acquisition agreement. As required under ASC 805 the company recorded 100% of the fair value of the assets and liabilities as of the date of acquisition, with the 20 percent noncontrolling interest recorded in the equity section of the company's balance sheet. The acquisition value exceeded the fair value of the assets acquired by $90.6 million, of which $55.4 million was recorded as goodwill and $42.2 million was recorded as intangible assets in the Rest of World segment. In addition, $7.0 million of deferred tax liabilities associated with the intangible assets were recorded. In 2010, the company made a goodwill adjustment of $1.1 million related to an inventory valuation. The company purchased the remaining 20 percent interest in SWT for $6 million from its former partner in the fourth quarter of 2010 and the company now owns 100 percent of SWT. The difference between the amount paid and the carrying value of the noncontrolling interest was recorded to additional paid-in capital. The $5.7 million future payment mentioned above was not paid due to breaches of representations and warranties and was recognized as a gain as part of a settlement with the former owner (see Note 4).

In July 2010, the company purchased the U.S. assets and the right to market and sell tankless water heaters in North America from Takagi Industrial Co, Ltd (Takagi) of Fuji-city, Shizuoka, Japan for $5.5 million. Through the venture, the company offers a full line of tankless water heaters under its own brands in association with the Takagi brand. Takagi is included in the North America segment.

In the fourth quarter of 2010, the company purchased the remaining 50 percent share of its China joint venture that manufactures combi-boilers for the residential market in China for $0.3 million. The joint venture was formed in December, 2007.

In April 2009, the company acquired the assets of Applied Energy Recovery Systems Inc. (AERS), a manufacturer of commercial and residential heat pump water heater products located in Norcross, Ga. The purchase price for the assets totaled $0.7 million, including a fixed payment of $0.1 million made in 2010 and contingent future payments totaling $0.2 million due during the period 2010 through 2013 based on achievement of sales projections. No contingent payments were made in 2011 or 2010. All future payments are subject to reductions for claims the company may make if there are any breaches of the representations and warranties made by the seller under the asset purchase agreement. The purchase price exceeded the fair value of the assets acquired by $0.5 million which was recorded as goodwill. AERS is included in the North America segment.

The acquisitions were accounted for under the purchase accounting method, and accordingly, the results of operations are included in the company's financial statements from the date of acquisition.

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Restructuring, Impairment, Other Charges And Settlement Income

12 Months Ended

Dec. 31, 2011

Restructuring, Impairment, Other Charges And Settlement Income [Abstract]

Restructuring, Impairment, Other Charges And Settlement Income

4.    Restructuring, Impairment, Other Charges and Settlement Income

Restructuring, Impairment and Settlement Income, Net

On May 5, 2011, the company entered into an agreement settling a legal action that the company commenced on June 30, 2009, in Tennessee State Court, seeking recovery for costs and damages due to an issue with a component part supplied by the vendor. Under the terms of the settlement agreement, the vendor and the vendor's supplier made a $35.5 million cash payment to the company. The settlement reimbursed the company for past costs previously incurred, satisfied in full a receivable recorded by the company, and the company increased its reserve for future costs associated with the affected components on company products by $7.5 million. In the second quarter of 2011, the company recorded a pretax gain of $11.2 million for the reimbursement of related costs incurred in prior years. This activity is included in the North America segment.

Also in the second quarter of 2011, the company recorded an $8.2 million warranty provision to reflect an estimate of expenses that it will likely incur in the future related to a similar component issue in Canada. On June 14, 2011, the company commenced legal action in the United States District Court for the Eastern District of Missouri against certain suppliers seeking recovery of increased costs and damages that the company incurred or will incur due to the issue in Canada. The company has not recorded any adjustments to its provision due to the early status of the legal action. These charges are included in the North America segment.

In 2010, the company recognized a $3.3 million impairment charge related to SWT's trademarks. The company announced plans to move the water treatment operations to Nanjing, China to recognize synergies associated with the company's strong management team and the engineering center in place at the company's water heater operations in that city. A restructuring charge of $1.8 million was recognized relative to the move for severance, lease termination and asset impairment costs. The charges were largely offset by a $5.0 million gain on settlement of disputes with the prior owner relative to breaches of representations and warranties regarding the condition of SWT on the date of purchase. This activity is included in Rest of World segment.

The following table presents an analysis of the company's restructuring, impairment and settlement reserve as of and for the years ended December 31, 2011 and 2010 (dollars in millions):

	Severance Costs			Intangible Impairment			Settlement Income			Other			Total
Balance at December 31, 2009	$	-		$	-		$	-		$	-		$	-
Expense (income) recognized		1.1			3.3			(5.0	)		0.7			0.1
Intangible asset write-down		-			(3.3	)		-			(0.1	)		(3.4	)
Settlement income		-			-			5.0			-			5.0
Balance at December 31, 2010	$	1.1		$	-		$	-		$	0.6		$	1.7
Cash payments		(1.1	)		-			-			(0.6	)		(1.7	)
Income recognized		-			-			(11.2	)		-			(11.2	)
Settlement income		-			-			11.2			-			11.2
Balance at December 31, 2011	$	-		$	-		$	-		$	-		$	-

Other Charges – Tower Automotive, Inc.

The company was the primary lessee on a facility lease in Corydon, Indiana related to a business sold to Tower Automotive, Inc. (Tower) in 1997. The company entered into a sublease arrangement with Tower in 1997 with the same terms and conditions as the company's lease. Tower filed for bankruptcy on February 2, 2005 and subsequently notified the company that it would reject the sublease arrangement effective October 1, 2005. In order to minimize costs, the company purchased the Corydon facility for $4.5 million on October 11, 2005. On March 26, 2009, the company sold the Corydon facility for $2.0 million which resulted in a $0.9 million loss that was recognized at the time of the sale.

Other Charges

The company recognized $0.4 million of expense in 2009, associated with retained liabilities of previously owned businesses which were sold by the company between 1997 and 2001. The majority of the $0.4 million recognized in 2009 is related to ongoing environmental liabilities.

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Inventories

12 Months Ended

Dec. 31, 2011

Inventories [Abstract]

Inventories

6. Inventories

December 31 (dollars in millions)	2011		2010
Finished products	$	85.6	$	72.7
Work in process		10.6		14.4
Raw materials		98.9		82.7
Inventories, at FIFO cost		195.1		169.8
LIFO reserve		26.7		23.0
	$	168.4	$	146.8

The company recognized after-tax LIFO expense (income) of $0.4 million, $0.3 million and $(0.6) million in 2011, 2010 and 2009, respectively.

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Inventories (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Inventories [Abstract]
Finished products	$ 85.6	$ 72.7
Work in process	10.6	14.4
Raw materials	98.9	82.7
Inventories, at FIFO cost	195.1	169.8
LIFO reserve	26.7	23.0
Inventories, Net	168.4	146.8
After-tax LIFO expense (income)	$ 0.4	$ 0.3	$ (0.6)

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Pension And Other Post-Retirement Benefits (Schedule Of Health Care Cost Trend Rates) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension And Other Post-Retirement Benefits [Abstract]
Health care cost trend rate assumed for next year	10.00%	10.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2016	2015

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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill And Other Intangible Assets
Amortization of other intangible assets	$ 9.6	$ 7.1	$ 3.9
Future amortization expenses	14.7
Amortization of intangible assets, weighted average period, years	17
Annual impairment of goodwill	0	0	0
Intangible asset impairment charge		$ 3.3

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Operations By Segment (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended					12 Months Ended				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 segments	Dec. 31, 2009	Dec. 31, 2011 Customer One [Member]	Dec. 31, 2010 Customer One [Member]	Dec. 31, 2011 Customer One [Member] North America [Member]	Dec. 31, 2010 Customer One [Member] North America [Member]	Dec. 31, 2011 Customer Two [Member]	Dec. 31, 2010 Customer Two [Member]	Dec. 31, 2011 Customer Two [Member] North America [Member]	Dec. 31, 2010 Customer Two [Member] North America [Member]
Segment Reporting Information [Line Items]
Number of reporting segments	2	2
Sales to a largest customer						$ 273.1	$ 237.9			$ 194.7	$ 177.3
Sales percentage				16.00%	16.00%			11.00%	12.00%
Equity loss in joint venture			$ 0.4

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Statement Of Cash Flows (Schedule Of Supplemental Cash Flow Information) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Statement Of Cash Flows [Abstract]
Receivables	$ (28.1)	$ (33.2)	$ (10.5)
Inventories	4.7	(32.0)	17.0
Other current assets	(4.5)	(1.5)	(1.0)
Trade payables	27.4	23.3	40.8
Accrued liabilities, including payroll and benefits	5.8	(0.7)	6.4
Income taxes payable	2.7	6.6	(5.9)
Net change in current assets and liabilities, net	$ 8.0	$ (37.5)	$ 46.8

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Ashland City, TN Facility Flood (Schedule Of Flood Related Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2010
Ashland City, TN Facility Flood [Abstract]
Repair or write off of buildings and equipment	$ 36.1
Net inventory loss	16.4
Site cleanup and restoration	14.8
Flood related expense	67.3
Less: insurance proceeds	31.9
Total flood related expense	$ 35.4

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Restructuring, Impairment, Other Charges And Settlement income (Tables)

12 Months Ended

Dec. 31, 2011

Restructuring, Impairment, Other Charges And Settlement Income [Abstract]

Schedule Of Analysis Of The Company's Restructuring, Impairment And Settlement Reserve

	Severance Costs			Intangible Impairment			Settlement Income			Other			Total
Balance at December 31, 2009	$	-		$	-		$	-		$	-		$	-
Expense (income) recognized		1.1			3.3			(5.0	)		0.7			0.1
Intangible asset write-down		-			(3.3	)		-			(0.1	)		(3.4	)
Settlement income		-			-			5.0			-			5.0
Balance at December 31, 2010	$	1.1		$	-		$	-		$	0.6		$	1.7
Cash payments		(1.1	)		-			-			(0.6	)		(1.7	)
Income recognized		-			-			(11.2	)		-			(11.2	)
Settlement income		-			-			11.2			-			11.2
Balance at December 31, 2011	$	-		$	-		$	-		$	-		$	-

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Organization And Significant Accounting Policies (Schedule Of Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Fair Value Measurements [Line Items]
Assets measured at fair value on recurring basis	$ 162.0	$ 1.4
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value Measurements [Line Items]
Assets measured at fair value on recurring basis	144.2	0.6
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurements [Line Items]
Assets measured at fair value on recurring basis	$ 17.8	$ 0.8

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Stock Based Compensation

12 Months Ended

Dec. 31, 2011

Stock Based Compensation [Abstract]

Stock Based Compensation

11.    Stock Based Compensation

The company adopted the A. O. Smith Combined Incentive Compensation Plan (the "plan") effective January 1, 2007. The plan is a continuation of the A. O. Smith Combined Executive Incentive Compensation Plan which was originally approved by shareholders in 2002. At the company's annual meeting of stockholders on April 14, 2009, an amendment to the plan was approved to increase the authorized shares of Common Stock under the plan by 1,875,000. The number of shares available for granting of options or share units at December 31, 2011, was 1,918,931. Upon stock option exercise, restricted stock grant, or share unit vesting, shares are issued from Treasury stock.

Total stock based compensation cost from continuing operations recognized in 2011, 2010 and 2009 was $5.7 million, $5.4 million and $5.1 million, respectively.

Stock options

The stock options granted in 2011, 2010 and 2009 have a three year pro rata vesting from the date of grant. Stock options are issued at exercise prices equal to the fair value of Common Stock on the date of grant. For active employees, all options granted in 2011, 2010 and 2009 expire ten years after date of grant. Stock option compensation recognized in 2011, 2010 and 2009 was $2.8 million, $2.2 million and $2.2 million, respectively. Included in the stock option expense recognized in 2011, 2010 and 2009 is expense associated with the accelerated vesting of stock option awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period.

Changes in option shares, all of which are Common Stock, were as follows:

	Weighted-Avg. Per Share		Years Ended December 31									(dollars in millions) Aggregate Intrinsic Value
	Exercise Price		2011			2010			2009
Outstanding at beginning of year		$22.17		1,623,101			1,630,751			1,933,601
Granted
2011—$43.12 to $44.12 per share				178,200
2010—$27.93 per share							237,000
2009—$16.40 to $21.66 per share										506,400
Exercised
2011—$15.99 to $27.93 per share				(364,081	)								$  7.7
2010—$9.04 to $25.84 per share							(240,801	)					3.3
2009—$9.04 to $19.47 per share										(809,250	)		8.1
Forfeited
2011—$19.00 to $43.12 per share				(15,353	)
2010—$19.00 to $27.93 per share							(3,849	)
Outstanding at end of year
(2011—$15.99 to $44.12 per share)		24.84		1,421,867			1,623,101			1,630,751
Exercisable at end of year		22.23		989,933			951,035			831,401

The aggregate intrinsic value for the outstanding and exercisable options as of December 31, 2011 is $20.0 million and $18.2 million, respectively. The average remaining contractual life for outstanding and exercisable options is eight years and seven years, respectively.

The following table summarizes weighted-average information by range of exercise prices for stock options outstanding and exercisable at December 31, 2011:

Range of     Exercise Prices	Options Outstanding at December 31, 2011	Weighted- Average Exercise Price	Options Exercisable at December 31, 2011	Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Life
$15.99 to $19.47	561,349	$  18.86	426,899	$    18.85	7 years
$21.34 to $24.02	298,401	23.18	294,851	23.20	7 years
$25.84 to $43.12	562,117	31.67	268,183	26.53	8 years
	1,421,867		989,933

The weighted-average fair value per option at the date of grant during 2011, 2010 and 2009, using the Black-Scholes option-pricing model, was $16.51, $10.19 and $5.47, respectively. Assumptions were as follows:

	2011		2010		2009
Expected life (years)		6.4		6.4		6.4
Risk-free interest rate		3.6%		3.6%		2.8%
Dividend yield		1.3%		1.9%		2.8%
Expected volatility		38.4%		38.7%		35.0%

The expected life is based on historical exercise behavior and the projected exercise of unexercised stock options. The risk free interest rate is based on the U.S. Treasury yield curve in effect on the date of grant for the respective expected life of the option. The expected dividend yield is based on the expected annual dividends divided by the grant date market value of our common stock. The expected volatility is based on the historical volatility of our common stock.

Restricted stock and share units

Participants may also be awarded shares of restricted stock or share units under the plan. The company granted 75,625, 101,873 and 159,801 share units under the plan in 2011, 2010 and 2009, respectively. Compensation expense was recognized ratably over the vesting period.

The share units were valued at $3.3 million, $2.9 million and $3.0 million at the date of issuance in 2011, 2010 and 2009, respectively, and will be recognized as compensation expense ratably over the three-year vesting period. Compensation expense of $2.9 million, $3.2 million and $2.9 million was recognized in 2011, 2010 and 2009, respectively. Included in share based compensation is expense associated with the accelerated vesting of share unit awards for certain employees who either are retirement eligible or become retirement eligible during the vesting period.

A summary of share unit activity under the plan is as follows:

	Number of Units			Weighted-Average Grant Date Value
Outstanding at January 1, 2011		473,438		$22.43
Granted		75,625		43.12
Vested		(233,702	)	22.72
Forfeited/cancelled		(28,807	)	25.28
Outstanding at December 31, 2011		286,554		$27.36

Total compensation expense for share units not yet recognized is $3.2 million at December 31, 2011. The weighted average period over which the expense is expected to be recognized is ten months.

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Commitments And Contingencies

12 Months Ended

Dec. 31, 2011

Commitments And Contingencies [Abstract]

Commitments And Contingencies

16. Commitments and Contingencies

The company is a potentially responsible party in 14 judicial and administrative proceedings initiated on behalf of various state and federal regulatory agencies seeking to clean up sites which have been environmentally impacted and to recover costs they have incurred or will incur as to the sites.

The company has established reserves for the sites and insurance proceeds and potential recovery from third parties are available to cover a portion of the company's potential liability. The company believes that any environmental claims for these sites in excess of reserves, insurance proceeds and indemnified amounts will not have a material effect on its financial position or results of operations.

The company is subject to various claims and pending lawsuits for product liability and other matters arising out of the conduct of the company's business. With respect to product liability claims, the company has self-insured a portion of its product liability loss exposure for many years. The company has established reserves which it believes are adequate to cover incurred claims. For the years ended December 31, 2011 and 2010, the company had $125 million of product liability insurance for individual losses in excess of $5 million. The company periodically reevaluates its exposure on claims and lawsuits and makes adjustments to its reserves as appropriate. The company believes, based on current knowledge, consultation with counsel, adequate reserves and insurance coverage, that the outcome of such claims and lawsuits will not have a material adverse effect on the company's financial position, results of operations or cash flows.

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Income Taxes (Difference Between Provision For Income Taxes And U.S. Federal Statutory Rate) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Provision at U.S. federal statutory rate	35.00%	35.00%	35.00%
State income and franchise taxes, net of federal benefit	3.20%	1.60%	2.90%
International income tax rate differential	(4.30%)	(13.40%)	(6.20%)
Research tax credits	(0.60%)	(0.40%)	(0.70%)
State tax credits	(2.30%)
Other	0.10%	0.50%	2.70%
Total	31.10%	23.30%	33.70%

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Organization And Significant Accounting Policies (Schedule Of Impact Of Derivative Contracts On The Company's Financial Statements) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	$ (0.4)	$ 1.4
Not Designated As Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	17.9
Foreign Currency Contracts [Member] | Designated As Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	1.3	1.1
Foreign Currency Contracts [Member] | Designated As Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	(1.6)	(0.5)
Commodities Contracts [Member] | Designated As Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets		0.8
Commodities Contracts [Member] | Designated As Hedging Instrument [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	(0.1)
Equity Collar Contract [Member] | Not Designated As Hedging Instrument [Member] | Investments [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, total	$ 17.9

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Operations By Segment (Schedule Of Net Sales And Long-Lived Assets By Geographic Location) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	$ 341.8				$ 283.7				$ 341.8	$ 283.7	$ 271.4
Net Sales	475.8	412.0	405.3	417.4	370.2	377.4	375.0	366.7	1,710.5	1,489.3	1,375.0
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	218.2				173.2				218.2	173.2	169.2
Net Sales									1,094.3	960.4	959.0
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	70.7				57.1				70.7	57.1	53.3
Net Sales									382.2	304.4	222.0
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	20.9				22.2				20.9	22.2	22.5
Net Sales									160.2	160.4	150.4
Other Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived Assets	32.0				31.2				32.0	31.2	26.4
Net Sales									$ 73.8	$ 64.1	$ 43.6

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Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2011

Stock Based Compensation [Abstract]

Schedule Of Changes In Option Shares

	Weighted-Avg. Per Share		Years Ended December 31									(dollars in millions) Aggregate Intrinsic Value
	Exercise Price		2011			2010			2009
Outstanding at beginning of year		$22.17		1,623,101			1,630,751			1,933,601
Granted
2011—$43.12 to $44.12 per share				178,200
2010—$27.93 per share							237,000
2009—$16.40 to $21.66 per share										506,400
Exercised
2011—$15.99 to $27.93 per share				(364,081	)								$  7.7
2010—$9.04 to $25.84 per share							(240,801	)					3.3
2009—$9.04 to $19.47 per share										(809,250	)		8.1
Forfeited
2011—$19.00 to $43.12 per share				(15,353	)
2010—$19.00 to $27.93 per share							(3,849	)
Outstanding at end of year
(2011—$15.99 to $44.12 per share)		24.84		1,421,867			1,623,101			1,630,751
Exercisable at end of year		22.23		989,933			951,035			831,401

Schedule Of Weighted-Average Information By Range Of Exercise Prices For Stock Options Outstanding And Exercisable

Range of     Exercise Prices	Options Outstanding at December 31, 2011	Weighted- Average Exercise Price	Options Exercisable at December 31, 2011	Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Life
$15.99 to $19.47	561,349	$  18.86	426,899	$    18.85	7 years
$21.34 to $24.02	298,401	23.18	294,851	23.20	7 years
$25.84 to $43.12	562,117	31.67	268,183	26.53	8 years
	1,421,867		989,933

Schedule Of Weighted-Average Fair Value Per Option At The Date Of Grant

	2011		2010		2009
Expected life (years)		6.4		6.4		6.4
Risk-free interest rate		3.6%		3.6%		2.8%
Dividend yield		1.3%		1.9%		2.8%
Expected volatility		38.4%		38.7%		35.0%

Schedule Of Share Unit Activity Under The Plan

	Number of Units			Weighted-Average Grant Date Value
Outstanding at January 1, 2011		473,438		$22.43
Granted		75,625		43.12
Vested		(233,702	)	22.72
Forfeited/cancelled		(28,807	)	25.28
Outstanding at December 31, 2011		286,554		$27.36

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Valuation And Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 1.9	$ 1.5
Acquisition of Businesses	6.6	0.4
Deductions2	(0.1)
Balance at End of Year	8.4	1.9
Valuation Allowance For Trade And Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	3.5	3.4	2.8
Charged to Costs and Expenses1	0.8	0.2	1.7
Acquisition of Businesses	0.3
Deductions2	(1.2)	(0.1)	(1.1)
Balance at End of Year	3.4	3.5	3.4
Valuation Allowance For Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	1.9	1.5	0.5
Charged to Costs and Expenses1	6.6	0.4	1.0
Deductions2	(0.1)
Balance at End of Year	$ 8.4	$ 1.9	$ 1.5

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Consolidated Statement Of Earnings (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Earnings [Abstract]
Earnings from discontinued operations, provision (benefit) for income taxes	$ 15.5	$ 16.2	$ (1.3)
Gain on sale of discontinued EPC operations, provision	$ 145.6

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Pension And Other Post-Retirement Benefits (Schedule Of Reconciliation Of The Fair Value Measurements Using Significant Unobservable Inputs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at end of year	$ 767.0	$ 640.3
Short-Term Investments [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at end of year	39.7	12.8
Significant Nonobservable Inputs (Level 3) [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	50.6	57.6
Relating to assets still held at the reporting date	(4.4)	4.0
Relating to assets sold during the period	9.8	(0.1)
Purchases, sales and settlements	18.6	(11.1)
Transfers in and/or out of Level 3		0.2
Plan assets at end of year	74.6	50.6
Significant Nonobservable Inputs (Level 3) [Member] | Short-Term Investments [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	12.7	28.2
Purchases, sales and settlements	27.0	27.0
Plan assets at end of year	39.7	12.7
Significant Nonobservable Inputs (Level 3) [Member] | Other Fixed Income Securities [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	0.2	0.2
Relating to assets still held at the reporting date
Relating to assets sold during the period
Purchases, sales and settlements
Transfers in and/or out of Level 3		0.2
Plan assets at end of year	0.2	0.2
Significant Nonobservable Inputs (Level 3) [Member] | Private Equity [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Plan assets at beginning of year	37.7	29.4
Relating to assets still held at the reporting date	(4.4)	4.0
Relating to assets sold during the period	9.8	(0.1)
Purchases, sales and settlements	(8.4)	4.4
Plan assets at end of year	$ 34.7	$ 37.7

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Consolidated Statement Of Stockholders' Equity (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statement Of Stockholders' Equity [Abstract]
Unrealized net (loss) gain on cash flow derivative instruments, less related income tax benefit (provision)	$ 7.0	$ 0.1	$ (35.0)
Change in pension liability, related income tax benefit	34.8	2.7	4.3
Exercise of stock options, shares surrendered as proceeds			258,238
Vesting of share units, shares surrendered to pay taxes		27,561
Unrealized net gain on investments, related tax provision	$ 0.7

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Acquisitions (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended				1 Months Ended	4 Months Ended	1 Months Ended	12 Months Ended							12 Months Ended		12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Aug. 26, 2011	Aug. 26, 2011 Lochinvar Corporation [Member]	Dec. 31, 2011 Lochinvar Corporation [Member]	Nov. 30, 2009 SWT [Member]	Dec. 31, 2010 SWT [Member]	Jul. 31, 2010 Takagi Industrial Co, Ltd [Member]	Dec. 31, 2010 China Joint Venture [Member]	Dec. 31, 2011 Applied Energy Recovery Systems Inc. [Member]	Dec. 31, 2010 Applied Energy Recovery Systems Inc. [Member]	Apr. 30, 2009 Applied Energy Recovery Systems Inc. [Member]	Dec. 31, 2011 2010 Through 2013 [Member] Applied Energy Recovery Systems Inc. [Member]	Dec. 31, 2011 Customer Lists [Member]	Dec. 31, 2011 Customer Lists [Member] Lochinvar Corporation [Member]	Dec. 31, 2011 Non-Compete Agreements And Patents [Member]	Dec. 31, 2011 Non-Compete Agreements And Patents [Member] Lochinvar Corporation [Member]	Dec. 31, 2011 Trade Names [Member] Lochinvar Corporation [Member]
Business Acquisition [Line Items]
Percentage of shares acquired													100.00%		80.00%	20.00%		50.00%
Cash acquired from acquisition													$ 1.5
Aggregate cash purchase price, net of cash acquired									421.1	11.8	71.4		421.1
Acquisition costs incurred													5.5	5.5
Contingent payment													35.0						0	0		0.2
Business acquisition future fixed cash payment															5.7
Volume of sales required to make additional contingent payment													216.0
Estimated fair value of the contingent payment														16.8
Acquired intangible assets												258.3	258.3
Acquired intangible assets that are not subject to amortization																											103.5
Acquired intangible assets subject to amortization																								152.5		2.3
Acquired intangible assets, amortization period, in years																							19		10
Business acquisition purchase price allocation goodwill and intangible assets deductible for income tax purposes	369.7								369.7
Revenues from acquisitions included in operations	475.8	412.0	405.3	417.4	370.2	377.4	375.0	366.7	1,710.5	1,489.3	1,375.0			75.9
Pretax earnings from acquisitions included in operations									161.5	74.4	91.8			5.6
Operating earnings from acquisitions included in operations														13.0
Interest expense included in operations									9.3	6.9	7.2			1.9
Cost of acquisition															76.7	6.0	5.5	0.3
Percentage of fair value of assets and liabilities recorded from acquisition															100.00%
Percentage of equity interest acquired															20.00%	100.00%
Excess of acquisition value over fair value of assets acquired															90.6
Deferred tax liabilities associated with intangible assets acquired															7.0
Goodwill acquired												111.4			55.4				0.5
Intangible assets acquired															42.2
Goodwill adjustment related to inventory valuation																1.1
Cash paid for acquisition																					0.7
Business acquisition future fixed cash payment made in period reported																				$ 0.1

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Pension And Other Post-Retirement Benefits (Schedule Of Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Service cost	$ 9.1		$ 8.6
Interest cost	44.1		46.7
Net actuarial loss (gain)	109.3		25.4		34.8
Amortization of net actuarial (loss) gain	(24.4)		(17.7)		(10.6)
Prior service cost	2.8				(12.4)
Amortization of prior service cost	0.9		0.9		(0.3)
Total recognized in other comprehensive earnings	88.6		8.6		11.5
Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings	93.5		19.1		19.8
Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Service cost	0.1		0.2
Interest cost	0.7		0.8
Net actuarial loss (gain)	0.2		(2.1)
Amortization of net actuarial (loss) gain	0.4		0.4
Amortization of prior service cost	(0.1)		(0.1)
Total recognized in other comprehensive earnings	0.5		(1.8)
Total Recognized in Net Periodic Cost (Benefit) and Other Comprehensive Earnings	(1.1)		(1.2)		1.2
Pension Benefits, Net Periodic Benefit Cost [Member] | Pension Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Service cost	9.1		8.6		8.4
Interest cost	44.2		46.7		49.8
Expected return on plan assets	(70.6)		(61.6)		(60.8)
Net actuarial loss	24.4		17.7		10.6
Prior service cost	(0.9)		(0.9)		0.3
Curtailment and other one-time charges	(1.3)
Defined-benefit plan cost	4.9		10.5		8.3
Various U.S. defined contribution plans cost	5.6		5.8		6.5
Total	10.5	[1]	16.3	[1]	14.8	[1]
Post-Retirement Benefits, Net Periodic Benefit Cost [Member] | Post-Retirement Benefits [Member]
Pension And Other Post-Retirement Benefits [Line Items]
Service cost	0.2		0.2		0.2
Interest cost	0.7		0.8		1.0
Net actuarial loss	(0.4)		(0.4)
Curtailment and other one-time charges	(2.1)
Defined-benefit plan cost	$ (1.6)		$ 0.6		$ 1.2

[1] Includes $(1.6) million, $0 million and $0.5 million of defined benefit plan (expense) income and $0.9 million, $1.2 million and $1.7 million of defined contribution plans expense that were included in earnings from discontinued operations for 2011, 2010 and 2009, respectively.

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Quarterly Results Of Operations (Schedule Of Quarterly Results Of Operations) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Quarterly Results Of Operations [Abstract]
Net sales	$ 475.8	$ 412.0	$ 405.3	$ 417.4	$ 370.2	$ 377.4	$ 375.0	$ 366.7	$ 1,710.5	$ 1,489.3	$ 1,375.0
Gross profit	155.0	118.7	111.9	127.0	116.3	107.2	114.2	108.3	512.6	446.0	394.9
Earnings, Continuing operations	31.5	26.9	28.6	24.2	20.5	16.2	(0.9)	21.3	111.2	57.1	60.5
Earnings, Discontinued operations	0.6	155.4	21.7	16.8	11.6	15.8	17.5	9.5	43.0	54.4	29.1
Net Earnings	32.1	182.3	50.3	41.0	32.1	32.0	16.6	30.8	305.7	111.5	89.6
Continuing operations					0.1			0.1		0.2	(9.6)
Discontinued operations											1.3
Net earnings attributable to A. O. Smith Corporation	$ 32.1	$ 182.3	$ 50.3	$ 41.0	$ 32.2	$ 32.0	$ 16.6	$ 30.9	$ 305.7	$ 111.7	$ 81.3
Basic earnings (loss) per share, Continuing operations	$ 0.68	$ 0.58	$ 0.62	$ 0.52	$ 0.45	$ 0.35	$ (0.02)	$ 0.47	$ 2.41	$ 1.25	$ 1.48
Basic earnings (loss) per share, Discontinued operations	$ 0.01	$ 3.36	$ 0.47	$ 0.37	$ 0.25	$ 0.35	$ 0.38	$ 0.21	$ 4.22	$ 1.19	$ 0.89
Basic earnings (loss) per share, Net	$ 0.69	$ 3.94	$ 1.09	$ 0.89	$ 0.70	$ 0.70	$ 0.36	$ 0.68	$ 6.63	$ 2.44	$ 2.37
Diluted earnings (loss) per share, Continuing operations	$ 0.68	$ 0.58	$ 0.62	$ 0.52	$ 0.44	$ 0.35	$ (0.02)	$ 0.46	$ 2.39	$ 1.24	$ 1.48
Diluted earnings (loss) per share, Discontinued operations	$ 0.01	$ 3.33	$ 0.46	$ 0.36	$ 0.25	$ 0.34	$ 0.38	$ 0.21	$ 4.18	$ 1.18	$ 0.88
Diluted earnings (loss) per share, Net	$ 0.69	$ 3.91	$ 1.08	$ 0.88	$ 0.69	$ 0.69	$ 0.36	$ 0.67	$ 6.57	$ 2.42	$ 2.36
Common dividends declared	$ 0.16	$ 0.16	$ 0.14	$ 0.14	$ 0.14	$ 0.14	$ 0.13	$ 0.13

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Debt And Lease Commitments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Debt And Lease Commitments [Abstract]
Revolving credit agreement	$ 425
Number of banks involved in multi-year multi-currency revolving credit agreement	8
Revolving credit agreement, maximum borrowing capacity subject to certain conditions	525
Revolving credit agreement expiration date	November 13, 2013
Future minimum payments under non-cancelable operating leases due, total	50.5
Rent expense, including payments under operating leases	16.1	13.9	12.3
Interest paid including discontinued operations	$ 11.5	$ 10.5	$ 11.9

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Operations By Segment

12 Months Ended

Dec. 31, 2011

Operations By Segment [Abstract]

Operations By Segment

17.  Operations by Segment

Prior to the sale of EPC the company had identified two segments, Water Products Company and EPC. As a result of the sale of EPC and a change in management reporting, the company reconsidered its segment reporting in the fourth quarter of 2011 and determined that it is comprised of two reporting segments: North America and Rest of World. Both segments manufacture and market comprehensive lines of residential gas, gas tankless, oil and electric water heaters, and commercial water heating equipment. Both segments primarily serve their respective regions of the world. The North America segment also manufactures and markets specialty commercial water heating equipment, condensing, and non-condensing boilers and water system tanks. The Rest of World segment also manufactures and markets water treatment products, primarily in Asia.

The accounting policies of the reportable segments are the same as those described in the "Summary of Significant Accounting Policies" outlined in Note 1. Operating earnings, defined by the company as earnings before interest, taxes, general corporate and corporate research and development expenses, was used to measure the performance of the segments.

	Earnings									Net Sales
Years ended December 31 (dollars in millions)	2011			2010			2009			2011			2010			2009
North America	$	154.0		$	91.2		$	115.8		$	1,289.5		$	1,155.4		$	1,135.9
Rest of World		42.7			42.4			33.0			455.6			368.9			256.5
Inter-segment		(0.2	)		(0.7	)		0.1			(34.6	)		(35.0	)		(17.4	)
Total segments – operating earnings	$	196.5		$	132.9		$	148.9		$	1,710.5		$	1,489.3		$	1,375.0
General corporate and research and development expenses		(25.7	)		(51.6	)		(50.3	)
Interest expense		(9.3	)		(6.9	)		(7.2	)
Earnings before income taxes		161.5			74.4			91.4
Provision for income taxes		(50.3	)		(17.3	)		(30.9	)
Earnings from continuing operations	$	111.2		$	57.1		$	60.5

In 2011, sales to the North America segment's two largest customers were $273.1 million and $194.7 million which represent 16 percent and 11 percent of the company's net sales, respectively. In 2010, sales to the North America segment's two largest customers were $237.9 million and $177.3 million which represent 16 percent and 12 percent of the company's net sales, respectively. North America operating earnings includes an equity loss in joint venture of $0.4 million in 2009.

Assets, depreciation and capital expenditures by segment

	Total Assets (December 31)						Depreciation and Amortization (Years Ended December 31)						Capital Expenditures (Years Ended December 31)
(dollars in millions)	2011		2010		2009		2011		2010		2009		2011		2010		2009
North America	$	1,319.2	$	868.3	$	826.9	$	33.9	$	30.2	$	32.2	$	31.6	$	37.8	$	26.9
Rest of World		342.4		299.7		268.5		12.4		10.0		5.6		20.5		13.8		15.1
Corporate assets		687.4		271.0		235.2		0.7		0.6		0.5		1.4		1.9		0.7
EPC discontinued operations		-		671.6		642.4		-		-		-		-		-		-
Total	$	2,349.0	$	2,110.6	$	1,973.0	$	47.0	$	40.8	$	38.3	$	53.5	$	53.5	$	42.7

The majority of corporate assets consist of cash and cash equivalents and deferred income taxes.

Net sales and long-lived assets by geographic location

The following data by geographic area includes net sales based on product shipment destination and long-lived assets based on physical location. Long-lived assets include net property, plant and equipment and other long-term assets and long-lived assets of previously owned businesses.

	Long-lived Assets							Net Sales
(dollars in millions)	2011		2010		2009			2011		2010		2009
United States	$	218.2	$	173.2	$	169.2	United States	$	1,094.3	$	960.4	$	959.0
China		70.7		57.1		53.3	China		382.2		304.4		222.0
Canada		20.9		22.2		22.5	Canada		160.2		160.4		150.4
Other Foreign		32.0		31.2		26.4	Other Foreign		73.8		64.1		43.6
Total	$	341.8	$	283.7	$	271.4	Total	$	1,710.5	$	1,489.3	$	1,375.0

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Stockholders' Equity (Schedule Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stockholders' Equity [Abstract]
Cumulative foreign currency translation adjustments	$ 16.5	$ 23.7
Unrealized net (loss) gain on cash flow derivative instruments (net of income tax benefit (provision) of $0.1 in 2011 and $(6.9) in 2010)	(0.3)	10.7
Pension liability (net of income tax of $204.1 in 2011 and $169.3 in 2010)	(318.3)	(263.8)
Unrealized net gain on investments less related income tax provision of $(0.7)	1.2
Accumulated other comprehensive loss	(300.9)	(229.4)
Unrealized net (loss) gain on cash flow derivative instruments, income tax benefit (provision)	0.1	(6.9)
Pension liability, income tax	204.1	169.3
Unrealized net gain on investments, related income tax provision	$ (0.7)

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Goodwill And Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2011

Goodwill And Other Intangible Assets [Abstract]

Schedule Of Changes In The Carrying Amount Of Goodwill

(dollars in millions)	North America			Rest of World			Total
Balance at December 31, 2009	$	264.6		$	55.3		$	319.9
Acquisition of businesses (see Note 3)		-			1.1			1.1
Currency translation adjustment		2.8			-			2.8
Balance at December 31, 2010		267.4			56.4			323.8
Acquisition of businesses (see Note 3)		108.8			2.6			111.4
Currency translation adjustment		(1.3	)		(0.1	)		(1.4	)
Balance at December 31, 2011	$	374.9		$	58.9		$	433.8

Schedule Of Carrying Amount Of Other Intangible Assets

	2011							2010
December 31 (dollars in millions)	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Amortizable intangible assets
Patents	$	6.8	$	(3.6	)	$	3.2	$	6.6	$	(2.8	)	$	3.8
Customer lists		231.0		(27.4	)		203.6		78.6		(18.6	)		60.0
Total amortizable intangible assets		237.8		(31.0	)		206.8		85.1		(21.4	)		63.7
Indefinite-lived intangible assets
Trade names		145.9		-			145.9		42.9		-			42.9
Total intangible assets	$	383.7	$	(31.0	)	$	352.7	$	128.0	$	(21.4	)	$	106.6

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Stockholders' Equity

12 Months Ended

Dec. 31, 2011

Stockholders' Equity [Abstract]

Stockholders' Equity

10.    Stockholders' Equity

The stockholders' equity presented in the consolidated financial statements has been impacted by the accounting treatment of the company's transaction with SICO which closed on April 22, 2009 and is discussed in more detail in Note 1 to the Notes to Consolidated Financial Statements. The primary impact on stockholders' equity is that the accounting rules require the presentation of SICO's stockholders' equity prior to the transaction. Subsequent to the transaction, A. O. Smith Corporation stockholders' equity activity is presented.

SICO's authorized capital consisted of 10 million shares of Common Stock $.10 par value.

The company's authorized capital consists of 3 million shares of Preferred Stock $1 par value, 14 million shares of Class A Common Stock $5 par value, and 60 million shares of Common Stock $1 par value. The Common Stock has equal dividend rights with Class A Common Stock and is entitled, as a class, to elect one-third of the Board of Directors and has 1/10th vote per share on all other matters. Class A Common Stock is convertible to Common Stock on a one for one basis.

During 2011, 2010 and 2009, there were 230,957, 364,520 and 4,365,845 shares, respectively, of Class A Common Stock converted into Common Stock. Regular dividends paid on the A. O. Smith Corporation Class A Common Stock and Common Stock amounted to $0.60, $0.54 and $0.51 per share in 2011, 2010 and 2009, respectively.

In December 2007, the company's Board of Directors authorized, and ratified on December 14, 2010, the purchase of 1.5 million shares of its outstanding Common Stock. 611,589 shares were purchased in 2011 at a total cost of $23.5 million. No shares were purchased in 2010 and 2009.

At December 31, 2011, 32,595 and 1,817,815 shares of Class A Common Stock and Common Stock, respectively, were held as treasury stock. At December 31, 2010, 32,595 and 1,811,199 shares of Class A Common Stock and Common Stock, respectively, were held as treasury stock.

Accumulated other comprehensive loss is as follows:

December 31 (dollars in millions)	2011			2010
Cumulative foreign currency translation adjustments	$	16.5		$	23.7
Unrealized net (loss) gain on cash flow derivative instruments (net of income tax benefit (provision) of $0.1 in 2011 and $(6.9) in 2010)		(0.3	)		10.7
Pension liability (net of income tax of $204.1 in 2011 and $169.3 in 2010)		(318.3	)		(263.8	)
Unrealized net gain on investments less related income tax provision of $(0.7)		1.2			-
	$	(300.9	)	$	(229.4	)

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Commitments And Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Commitments And Contingencies [Abstract]
Number of judicial and administrative proceedings for which the company is responsible	14
Product liability insurance for individual losses in excess of accrual amount	$ 125	$ 125
Amounts in excess to be covered by third party insurance	$ 5	$ 5