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Revenue Recognition | 12 Months Ended
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Dec. 31, 2025
Revenue Recognition and Deferred Revenue [Abstract] |
Revenue from Contract with Customer [Text Block] | 8. Revenue Recognition: The following table disaggregates our revenue by business segment by geography to provide information as to the major sources of revenue. See Note 3 for additional description of our reportable business segments and the products and services being sold in each segment.
| For the Year Ended December 31, 2025
Primary Geographic Markets | Home Comfort Solutions |  | Building Climate Solutions |  | Corporate and Other |  | Consolidated
United States | $ | 3,097.4 |  |  | $ | 1,724.5 |  |  | $ | — |  |  | $ | 4,821.9 |
Canada | 246.0 |  |  | 127.4 |  |  | — |  |  | 373.4 |
Total | $ | 3,343.4 |  |  | $ | 1,851.9 |  |  | $ | — |  |  | $ | 5,195.3 |
| For the Year Ended December 31, 2024
Primary Geographic Markets | Home Comfort Solutions |  | Building Climate Solutions |  | Corporate and Other |  | Consolidated
United States | $ | 3,346.0 |  |  | $ | 1,675.8 |  |  | $ | — |  |  | $ | 5,021.8 |
Canada | 231.1 |  |  | 88.4 |  |  | — |  |  | 319.5 |
Total | $ | 3,577.1 |  |  | $ | 1,764.2 |  |  | $ | — |  |  | $ | 5,341.3 |
| For the Year Ended December 31, 2023
Primary Geographic Markets | Home Comfort Solutions |  | Building Climate Solutions |  | Corporate and Other |  | Consolidated
United States | $ | 3,001.3 |  |  | $ | 1,415.6 |  |  | $ | — |  |  | $ | 4,416.9 |
Canada | 221.6 |  |  | 95.8 |  |  | — |  |  | 317.4 |
International | — |  |  | — |  |  | 247.6 |  |  | 247.6 |
Total | $ | 3,222.9 |  |  | $ | 1,511.4 |  |  | $ | 247.6 |  |  | $ | 4,981.9 |
For our businesses that provide services, revenue is recognized at the time services are completed. Our Building Climate Solutions segment also provides sales, installation, maintenance and repair services under fixed-price contracts. Revenue for services is recognized as the services are performed under the contract based on the relative fair value of the services provided. We allocate a portion of the revenue for extended labor warranty obligations and recognize the revenue over the term of the extended warranty. Revenue from extended warranties is insignificant. See Note 5 for more information on product warranties. Home Comfort Solutions - We manufacture and market a broad range of furnaces, air conditioners, heat pumps, packaged heating and cooling systems, equipment and accessories to improve indoor air quality, comfort control products, replacement parts and supplies and related products for both the residential replacement and new construction markets in North America. These products are sold under various brand names and are sold either through direct sales to a network of independent installing dealers, including through our network of Lennox Stores or to independent distributors. In the fourth quarter of 2025, we acquired Sealed Unit Parts Buyer, Inc. (“Supco”), which sells HVAC parts and supplies with HVACR applications. For the years ended December 31, 2025, 2024 and 2023, direct sales re presented 76%, 74% and 75% of revenues, respectively, and sales to independent distributors represented the remainder. Given the nature of our business, customer product orders are fulfilled at a point in time and not over a period of time. Building Climate Solutions - In North America, we manufacture and sell unitary heating and cooling equipment used in light commercial applications, such as low-rise office buildings, restaurants, retail centers, churches and schools. These products are distributed primarily through commercial contractors and directly to national account customers in the planned replacement, emergency replacement and new construction markets. We manufacture and market equipment for the commercial refrigeration markets under the Heatcraft Worldwide Refrigeration name. Our products are used in the food retail, food service, cold storage as well as non-food refrigeration markets. We sell these products to distributors, installing contractors, engineering design firms, original equipment manufacturers and end-users. Lennox National Account Services provides installation, service and preventive maintenance for HVAC national account customers in the U.S. and Canada. AES manufactures curb, curb adapters, drop box diffusers and also offers HVAC recycling and salvage services, as well as focusing on multi-family HVAC replacement for expired mechanical assets. In the fourth quarter of 2025, we acquired Duro Dyne Buyer, Inc. (“Duro Dyne”), which manufactures and sells HVAC parts and supplies such as air distribution accessories, switches and controls, and other engineered components and accessories with HVACR applications. Revenue related to service contracts is recognized as the services are performed under the contract based on the relative fair value of the services provided. For the years ended December 31, 2025, 2024 and 2023, equipment sales represented 80%, 80% and 86% of revenues, resp ectively, and the remainder of our revenue was generated from our service business. Corporate and Other - In Europe, we manufactured and marketed equipment for the global commercial refrigeration markets. We also manufactured and sold unitary heating and cooling products and applied systems. In the fourth quarter of 2023, we successfully completed the divestiture of our European operations. Variable Consideration - We engage in cooperative advertising, customer rebate, and other miscellaneous programs that result in payments or credits being issued to our customers. We record these customer discounts and incentives as a reduction of sales when the sales are recorded. For certain cooperative advertising programs, we also receive an identifiable benefit (goods or services) in exchange for the consideration given, and, accordingly, record a ratable portion of the expenditure to SG&A expenses. All other advertising, promotions and marketing costs are expensed as incurred. Other Judgments and Assumptions - We apply the practical expedient in ASC 606-10-50-14 and do not disclose information about remaining performance obligations that have original expected durations of one year or less. Applying the practical expedient in ASC 340-40-25-4, we recognize the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that we otherwise would have recognized is one year or less. These costs are included in SG&A expenses. ASC 606-10-32-18 allows us to not adjust the amount of consideration to be received in a contract for any significant financing component if we expect to receive payment within twelve months of transfer of control of goods or services. We have elected this expedient as we expect all consideration to be received in one year or less at contract inception. We have also elected not to provide the remaining performance obligations disclosures related to service contracts in accordance with the practical expedient in ASC 606-10-55-18. We recognize revenue in the amount to which the entity has a right to invoice and have adopted this election to not provide the remaining performance obligations related to service contracts. Contract Assets - We do not have material amounts of contract assets since revenue is recognized as control of goods is transferred or as services are performed. There are a small number of installation services that may occur over a period of time, but that period of time is generally very short in duration and right of payment does not exist until the installation is completed. Any contract assets that may arise are recorded in Other assets in our Consolidated Balance Sheets. Contract Liabilities - Our contract liabilities consist of advance payments and deferred revenue. Our contract liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. We classify advance payments and deferred revenue as current or noncurrent based on the timing of when we expect to recognize revenue. Generally all contract liabilities are expected to be recognized within one year and are included in Accrued expenses in our Consolidated Balance Sheets. The noncurrent portion of deferred revenue is included in Other liabilities in our Consolidated Balance Sheets. Net contract assets (liabilities) consisted of the following:
| December 31, 2025 |  | December 31, 2024 |  |  |  |
Contract assets | $ | 1.7 |  |  | $ | 1.2 |  |  |  |  |
Contract liabilities - current | (10.5) |  |  | (5.0) |  |  |  |  |
Contract liabilities - noncurrent | (10.3) |  |  | (8.4) |  |  |  |  |
Total | $ | (19.1) |  |  | $ | (12.2) |  |  |  |  |
For the years ended December 31, 2025, 2024, and 2023, we recognized revenue of $4.6 million, $7.4 million and $7.7 million related to our contract liabilities at January 1, 2025, 2024 and 2023, respectively. Impairment losses recognized in our receivables and contract assets were de minimis in 2025, 2024 and 2023.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-9 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-10 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-15 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-12 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org/606/tableOfContent + Details
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