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Property, Plant and Equipment - Summary of Impairment Charges (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of property, plant & equipment | $ 0.4 | $ 2.0 | $ 64.5
North America Fiber Cement |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of property, plant & equipment | 0.4 | 2.0 | 44.0
Asia Pacific Fiber Cement |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of property, plant & equipment | 0.0 | 0.0 | 15.0
Europe Building Products |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |
Impairment of property, plant & equipment | $ 0.0 | $ 0.0 | $ 5.5

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