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Goodwill and Other Intangible Assets | 3 Months Ended
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Jun. 30, 2026
Intangible Asset, Goodwill and Other [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Goodwill The following are the changes in the carrying value of goodwill:
(Millions of U.S. dollars) | Europe |  | Siding & Trim |  | Deck, Rail & Accessories |  | Total
Balance - March 31, 2026 | $ | 205.0 |  |  | $ | 1,141.2 |  |  | $ | 3,434.2 |  |  | $ | 4,780.4 |
Foreign exchange impact | (1.5) |  |  | — |  |  | — |  |  | (1.5) |
Adjustments to Acquisition of The AZEK Company | — |  |  | (0.8) |  |  | (2.3) |  |  | (3.1) |
Balance - June 30, 2026 | $ | 203.5 |  |  | $ | 1,140.4 |  |  | $ | 3,431.9 |  |  | $ | 4,775.8 |
Intangible Assets The following are the net carrying amount of indefinite lived intangible assets other than goodwill:
| June 30, |  | March 31,
(Millions of U.S. dollars) | 2026 |  | 2026
Trade names | $ | 117.3 |  |  | $ | 118.2 |
Other | 7.6 |  |  | 7.4 |
Total | $ | 124.9 |  |  | $ | 125.6 |
The following are the net carrying amount of amortizable intangible assets:
|  | June 30, 2026
(Millions of U.S. dollars) | Lives in Years | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer Relationships | 2 to 18 | $ | 2,880.0 |  |  | $ | (228.4) |  |  | $ | 2,651.6 |
Trade Names | 5 to 15 | 330.0 |  |  | (26.7) |  |  | 303.3 |
Technology | 10 | 210.0 |  |  | (29.3) |  |  | 180.7 |
Total |  | $ | 3,420.0 |  |  | $ | (284.4) |  |  | $ | 3,135.6 |
|  | March 31, 2026
(Millions of U.S. dollars) | Lives in Years | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer Relationships | 2 to 18 | $ | 2,880.3 |  |  | $ | (165.8) |  |  | $ | 2,714.5 |
Trade Names | 5 to 15 | 330.0 |  |  | (19.6) |  |  | 310.4 |
Technology | 10 | 210.0 |  |  | (20.4) |  |  | 189.6 |
Total |  | $ | 3,420.3 |  |  | $ | (205.8) |  |  | $ | 3,214.5 |
The amortization of intangible assets was $78.9 million and $1.3 million and for the three months ended June 30, 2026 and 2025, respectively. As of June 30, 2026, the remaining weighted average amortization period for acquired intangible assets was 16.4 years.

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- Definition The entire disclosure for intangible asset and goodwill. Includes, but is not limited to, finite- and indefinite-lived intangible assets, capitalized cost for internal-use software and software to be sold, leased, or marketed. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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