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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |
Schedule of Net Sales Disaggregated by Segment and Major Product Line | The following table disaggregates the Company’s net sales by segment. As described above, the Company’s North America segment sales are further disaggregated by major product line. In addition, the Company’s Rest of World segment sales are disaggregated by China and all other Rest of World.
Years ended December 31 (dollars in millions) | 2024 |  | 2023 |  | 2022
North America |  |  |  |  |
Water heaters and related parts | $ | 2,441.7 |  |  | $ | 2,456.9 |  |  | $ | 2,325.1 |
Boilers and related parts | 260.0 |  |  | 240.1 |  |  | 272.0 |
Water treatment products | 248.4 |  |  | 225.9 |  |  | 222.0 |
Total North America | 2,950.1 |  |  | 2,922.9 |  |  | 2,819.1 |
Rest of World |  |  |  |  |
China | $ | 791.9 |  |  | $ | 835.1 |  |  | $ | 839.1 |
All other Rest of World | 126.7 |  |  | 121.8 |  |  | 126.7 |
Total Rest of World | 918.6 |  |  | 956.9 |  |  | 965.8 |
Inter-segment sales | (50.6) |  |  | (27.0) |  |  | (31.0) |
Total Net Sales | $ | 3,818.1 |  |  | $ | 3,852.8 |  |  | $ | 3,753.9 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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