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Operating Segment Information and Concentrations of Risk - Summary of Geographical Information 2 (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Selling, general and administrative expenses | $ 461.2 | $ 389.6 | $ 415.8
Research and development costs | 38.0 | 34.3 | 32.8
Property, plant and equipment | 0.4 | 2.0 | 64.5
Right-of-use assets |  |  | 11.2
Intangible assets |  |  | 1.4
Inventories |  |  | 2.9
Goodwill |  |  | 0.2
Asset Retirement Obligations |  |  | 5.8
Other |  |  | 1.2
Restructuring expenses | 0.0 | 11.1 | 84.4
Property, Plant and Equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment |  | 61.7 |
General Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Right-of-use assets |  |  | 0.0
Intangible assets |  |  | 1.4
Inventories |  |  | 0.0
Goodwill |  |  | 0.0
Asset Retirement Obligations |  |  | 0.0
Other |  |  | 0.0
Restructuring expenses |  |  | 1.4
General Corporate | Property, Plant and Equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment |  | 0.0 |
North America Fiber Cement |  |  |
Segment Reporting Information [Line Items] |  |  |
Research and development costs | 5.3 | 5.6 | 5.3
Property, plant and equipment | 0.4 | 2.0 | 44.0
North America Fiber Cement | Cost of Sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Other | 0.4 | 2.0 | 2.8
North America Fiber Cement | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Right-of-use assets |  |  | 0.0
Intangible assets |  |  | 0.0
Inventories |  |  | 0.0
Goodwill |  |  | 0.0
Asset Retirement Obligations |  |  | 0.0
Other |  |  | 0.0
Restructuring expenses |  |  | 41.2
North America Fiber Cement | Operating Segments | Property, Plant and Equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment |  | 41.2 |
Asia Pacific Fiber Cement |  |  |
Segment Reporting Information [Line Items] |  |  |
Research and development costs | 1.5 | 1.1 | 1.8
Property, plant and equipment | 0.0 | 0.0 | 15.0
Inventories |  |  | 2.9
Asia Pacific Fiber Cement | Other liabilities - non-current |  |  |
Segment Reporting Information [Line Items] |  |  |
Asset retirement obligation |  |  | 8.0
Asia Pacific Fiber Cement | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Right-of-use assets |  |  | 11.2
Intangible assets |  |  | 0.0
Inventories |  |  | 2.9
Goodwill |  |  | 0.2
Asset Retirement Obligations |  |  | 5.8
Other |  |  | 1.2
Restructuring expenses |  |  | 36.3
Asia Pacific Fiber Cement | Operating Segments | Property, Plant and Equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment |  | 15.0 |
Europe Building Products |  |  |
Segment Reporting Information [Line Items] |  |  |
Research and development costs | 0.9 | 1.6 | 1.7
Property, plant and equipment | 0.0 | 0.0 | 5.5
Europe Building Products | Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Right-of-use assets |  |  | 0.0
Intangible assets |  |  | 0.0
Inventories |  |  | 0.0
Goodwill |  |  | 0.0
Asset Retirement Obligations |  |  | 0.0
Other |  |  | 0.0
Restructuring expenses |  |  | 5.5
Europe Building Products | Operating Segments | Property, Plant and Equipment |  |  |
Segment Reporting Information [Line Items] |  |  |
Property, plant and equipment |  | 5.5 |
Research and Development |  |  |
Segment Reporting Information [Line Items] |  |  |
Selling, general and administrative expenses | 4.1 | 2.9 | 3.0
Research and development costs | $ 30.3 | $ 26.0 | $ 24.0

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