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Goodwill and Other Intangible Assets | 12 Months Ended
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Mar. 31, 2022
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 2020 | $ | 196.9 |  |  |
Foreign exchange impact | 12.4 |  |  |
Balance - 31 March 2021 | $ | 209.3 |  |  |
Foreign exchange impact | (9.8) |  |  |
Balance - 31 March 2022 | $ | 199.5 |  |  |
Intangible Assets The following are the net carrying amount of indefinite lived intangible assets other than goodwill:
| 31 March
(Millions of US dollars) | 2022 |  | 2021
Tradenames | $ | 115.0 |  |  | $ | 120.6 |
Other | 7.4 |  |  | 7.4 |
Total | $ | 122.4 |  |  | $ | 128.0 |
The following are the net carrying amount of amortizable intangible assets:
| 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 |
| Year Ended 31 March 2021
(Millions of US dollars) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer Relationships | $ | 55.2 |  |  | $ | (9.3) |  |  | $ | 45.9 |
Other | 10.9 |  |  | (10.9) |  |  | — |
Total | $ | 66.1 |  |  | $ | (20.2) |  |  | $ | 45.9 |
The amortization of intangible assets was US$3.5 million, US$2.6 million and US$3.1 million for the fiscal years ended 31 March 2022, 2021 and 2020, respectively. At 31 March 2022, the estimated future amortization of intangible assets is as follows:
Years ended 31 March (Millions of US dollars): |
2023 | $ | 4.1 |
2024 | $ | 4.4 |
2025 | $ | 4.6 |
2026 | $ | 4.7 |
2027 | $ | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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