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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Rollforward of Goodwill | The following are the changes in the carrying value of goodwill for the fiscal years ended 31 March 2021 and 2020:
(Millions of US dollars) | Europe Building Products |  | Asia Pacific Fiber Cement |  | Total
Balance - 31 March 2019 | $ | 200.8 |  |  | $ | 0.3 |  |  | $ | 201.1 |
Impairment | — |  |  | (0.2) |  |  | (0.2) |
Foreign exchange impact | (3.9) |  |  | (0.1) |  |  | (4.0) |
Balance - 31 March 2020 | $ | 196.9 |  |  | $ | — |  |  | $ | 196.9 |
Foreign exchange impact | 12.4 |  |  | — |  |  | 12.4 |
Balance - 31 March 2021 | $ | 209.3 |  |  | $ | — |  |  | $ | 209.3 |
Schedule of Indefinite-Lived Intangible Assets | The following are the net carrying amount of indefinite lived intangible assets other than goodwill for the fiscal years ended 31 March 2021 and 2020:
| 31 March
(Millions of US dollars) | 2021 |  | 2020
Tradenames | $ | 120.6 |  |  | $ | 113.5 |
Other | 7.4 |  |  | 7.4 |
Total | $ | 128.0 |  |  | $ | 120.9 |
Schedule of Finite-Lived Intangible Assets | The following are the net carrying amount of amortizable intangible assets for the fiscal years ended 31 March 2021 and 2020:
| 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 |
| Year Ended 31 March 2020
(Millions of US dollars) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer Relationships | $ | 51.4 |  |  | $ | (6.4) |  |  | $ | 45.0 |
Other | 11.6 |  |  | (10.8) |  |  | 0.8 |
Total | $ | 63.0 |  |  | $ | (17.2) |  |  | $ | 45.8 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | At 31 March 2021, the estimated future amortization of intangible assets is as follows:
Years ended 31 March (Millions of US dollars): |
2022 | $ | 3.5 |
2023 | 4.3 |
2024 | 4.7 |
2025 | 4.8 |
2026 | 5.0 |

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