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Property, Plant and Equipment - Additional Information (Details) $ in Millions | 12 Months Ended
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Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) plant | Mar. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense | $ 129.6 | $ 125.4 | $ 109.6
Restructuring expenses | 0.0 | 77.4 | 15.9
Property, plant and equipment, net | 1,372.3 | 1,341.7 |
Other impairment charges |  | 1.2 |
Shut Down of Summerville, South Carolina Facility |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment charges related to decision to shut down facility |  | 12.0 |
Impairment charge, difference between carrying value and fair value |  | 22.1 |
Costs to sell |  | 10.1 |
Non-Core Assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Impairment charges related to decision to shut down facility |  | $ 29.2 |
Number of plants | plant |  | 4 |
North America Fiber Cement |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Restructuring expenses |  | $ 41.2 | 2.6
North America Fiber Cement | Cost of Sales |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Other impairment charges | $ 2.0 | 2.8 | 0.4
Asia Pacific Fiber Cement | Penrose Plant Assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, net |  | 2.6 |
Asia Pacific Fiber Cement | Exit of Business |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Restructuring expenses |  | 14.0 |
Impairment charges related to decision to shut down facility |  | 1.0 |
Europe Building Products | Non-Core Assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Restructuring expenses |  | $ 5.5 |
Other Businesses |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Restructuring expenses |  |  | $ 6.1

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