Goodwill and Other Intangible Assets - Rollforward of Goodwill (Details) - USD ($) $ in Millions |
12 Months Ended | |
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Mar. 31, 2021 |
Mar. 31, 2020 |
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| Goodwill [Roll Forward] | ||
| Balance, beginning | $ 196.9 | $ 201.1 |
| Impairment | (0.2) | |
| Foreign exchange impact | 12.4 | (4.0) |
| Balance, ending | 209.3 | 196.9 |
| Europe Building Products | ||
| Goodwill [Roll Forward] | ||
| Balance, beginning | 196.9 | 200.8 |
| Impairment | 0.0 | |
| Foreign exchange impact | 12.4 | (3.9) |
| Balance, ending | 209.3 | 196.9 |
| Asia Pacific Fiber Cement | ||
| Goodwill [Roll Forward] | ||
| Balance, beginning | 0.0 | 0.3 |
| Impairment | (0.2) | |
| Foreign exchange impact | 0.0 | (0.1) |
| Balance, ending | $ 0.0 | $ 0.0 |
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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