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Goodwill and Other Intangible Assets | 12 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Other Intangible Assets All long-lived intangible assets are reviewed for impairment at least annually, or more frequently if an event occurs indicating the potential for impairment. The Company performed the annual assessment for impairment in the third quarter of fiscal year 2021, noting no impairment. 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 |
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 |
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 |
The amortization of intangible assets was US$2.6 million, US$3.1 million and US$6.1 million for the fiscal years ended 31 March 2021, 2020 and 2019, respectively. 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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- 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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