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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Jun. 30, 2026
Intangible Asset, Goodwill and Other [Abstract] |
Schedule of Changes in the Carrying Value of 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 |
Schedule of Intangible Asset, Indefinite-Lived | 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 |
Schedule of Intangible Asset, Finite-Lived | 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 |

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