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Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Carrying Value of Goodwill | The following are the changes in the carrying value of goodwill for the fiscal years ended 31 March 2020 and 2019:
(Millions of US dollars) | Europe Building Products |  | Asia Pacific Fiber Cement |  | Other Businesses |  | Total
Balance - 31 March 2018 | $ | — |  |  | $ | 0.3 |  |  | $ | 4.6 |  |  | $ | 4.9 |
Acquired | 220.0 |  |  | — |  |  | — |  |  | 220.0 |
Impairment | — |  |  | — |  |  | (4.6 | ) |  | (4.6 | )
Foreign exchange impact | (19.2 | ) |  | — |  |  | — |  |  | (19.2 | )
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 |
Schedule of Finite-Lived Intangible Assets | The following are the net carrying amount of amortizable intangible assets for the fiscal years ended 31 March 2020 and 2019:
| 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 1 | 11.6 |  |  | (10.8 | ) |  | 0.8 |
Total | $ | 63.0 |  |  | $ | (17.2 | ) |  | $ | 45.8 |
1 Includes impairment charges of US$1.4 million for the fiscal year ended 31 March 2020
| Year Ended 31 March 2019
(Millions of US dollars) | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer Relationships | $ | 52.0 |  |  | $ | (4.3 | ) |  | $ | 47.7 |
Other 1 | 11.8 |  |  | (8.6 | ) |  | 3.2 |
Total | $ | 63.8 |  |  | $ | (12.9 | ) |  | $ | 50.9 |
1 Includes impairment charges of US$2.6 million for the fiscal year ended 31 March 2019
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | At 31 March 2020, the estimated future amortization of intangible assets is as follows:
Years ended 31 March (Millions of US dollars): |
2021 | $ | 2.6 |
2022 | 3.3 |
2023 | 4.1 |
2024 | 4.4 |
2025 | 4.5 |

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