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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, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Selling, general and administrative expenses | $ 389.6 | $ 415.8 | $ 403.6
Research and development costs | 34.3 | 32.8 | 37.9
Property, plant and equipment | 2.0 | 64.5 | 9.1
Right-of-use assets |  | 11.2 |
Intangible assets |  | 1.4 |
Inventories |  | 2.9 |
Goodwill |  | 0.2 |
Asset Retirement Obligations |  | 5.8 |
Other |  | 1.2 |
Asset impairments | 11.1 | 84.4 | 15.9
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 |
Asset impairments |  | 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 | 5.6 | 5.3 | 6.5
Property, plant and equipment | 2.0 | 44.0 | 3.0
North America Fiber Cement | Cost of Sales |  |  |
Segment Reporting Information [Line Items] |  |  |
Other | 2.0 | 2.8 | 0.4
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 |
Asset impairments |  | 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 | 1.1 | 1.8 | 2.1
Property, plant and equipment | 0.0 | 15.0 | 0.0
Inventories | 2.9 |  |
Goodwill |  | 0.2 |
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 |
Asset impairments |  | 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 | 1.6 | 1.7 | 2.6
Property, plant and equipment | 0.0 | 5.5 | 0.0
Goodwill |  | 0.0 |
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 |
Asset impairments |  | 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 | 2.9 | 3.0 | 2.3
Research and development costs | $ 26.0 | $ 24.0 | $ 26.7

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