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Goodwill and Other Intangible Assets | 12 Months Ended
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Mar. 31, 2023
Goodwill and Intangible Assets Disclosure [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 US dollars) | Europe Building Products |  |
Balance - 31 March 2021 | $ | 209.3 |  |  |
Foreign exchange impact | (9.8) |  |  |
Balance - 31 March 2022 | $ | 199.5 |  |  |
Foreign exchange impact | (4.6) |  |  |
Balance - 31 March 2023 | $ | 194.9 |  |  |
Intangible Assets The following are the net carrying amount of indefinite lived intangible assets other than goodwill:
| 31 March
(Millions of US dollars) | 2023 |  | 2022
Tradenames | $ | 112.3 |  |  | $ | 115.0 |
Other | 7.4 |  |  | 7.4 |
Total | $ | 119.7 |  |  | $ | 122.4 |
The following are the net carrying amount of amortizable intangible assets:
| Year Ended 31 March 2023
(Millions of US dollars) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer Relationships | $ | 47.9 |  |  | $ | (12.4) |  |  | $ | 35.5 |
Total | $ | 47.9 |  |  | $ | (12.4) |  |  | $ | 35.5 |
| Year Ended 31 March 2022
(Millions of US dollars) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer Relationships | $ | 52.9 |  |  | $ | (12.5) |  |  | $ | 40.4 |
Total | $ | 52.9 |  |  | $ | (12.5) |  |  | $ | 40.4 |
The amortization of intangible assets was US$3.8 million, US$3.5 million and US$2.6 million for the fiscal years ended 31 March 2023, 2022 and 2021, respectively. At 31 March 2023, the estimated future amortization of intangible assets is as follows:
Years ended 31 March (Millions of US dollars): |
2024 | $ | 4.3 |
2025 | 4.5 |
2026 | 4.6 |
2027 | 4.9 |
2028 | 5.0 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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