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Operating Segment Information and Concentrations of Risk - Summary of Geographical Information 2 (Detail) $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2017 AUD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Research and development costs |  |  | $ 37.9 | $ 33.3 | $ 30.3
Selling, general and administrative expenses |  |  | 403.6 | 311.3 | 291.6
Asbestos adjustments | $ (43.6) | $ (56.8) | (22.0) | (156.4) | 40.4
AICF SG&A expenses |  |  | (1.5) | (1.9) | (1.5)
Net interest (income) expense |  |  | 50.1 | 29.5 | 27.5
Asset impairments |  |  | 15.9 | 0.0 | 0.0
Disposed of by Sale | Fontana Building | Buildings |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gain from disposition |  |  | 0.0 | 3.4 | 0.0
General Corporate |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asbestos adjustments |  |  | (22.0) | (156.4) | 40.4
Value of Asbestos-related assets |  |  | 486.8 | 537.7 |
North America Fiber Cement |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Research and development costs |  |  | 6.5 | 6.1 | 6.2
Asset impairments |  |  | 3.0 | 0.0 | 0.0
Asia Pacific Fiber Cement |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Research and development costs |  |  | 2.1 | 1.8 | 1.5
Europe Building Products |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Research and development costs |  |  | 2.6 | 0.0 | 0.0
Research and Development |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Research and development costs |  |  | 26.7 | 25.4 | 22.6
Selling, general and administrative expenses |  |  | 2.3 | 2.4 | 2.9
AICF Funding |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net interest (income) expense |  |  | (2.0) | (1.9) | 1.1
Asia Pacific |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
New Zealand weathertightness claims (expense)/ benefit |  |  | 3.3 | 0.0 | 0.0
Other Businesses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  | 12.9 | 0.0 | 0.0
Fermacell |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Business Acquisition, Transaction Costs |  |  | 0.0 | $ 10.0 | $ 0.0
Transaction and integration related costs |  |  | 21.8 |  |
Inventory fair value adjustment |  |  | 7.3 |  |
Goodwill | North America Fiber Cement |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  | 0.0 |  |
Goodwill | Other Businesses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  | 4.6 |  |
Property, Plant and Equipment | North America Fiber Cement |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  | 2.6 |  |
Property, Plant and Equipment | Other Businesses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  | 6.1 |  |
Finite-Lived Intangible Assets | North America Fiber Cement |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  | 0.4 |  |
Finite-Lived Intangible Assets | Other Businesses |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Asset impairments |  |  | $ 2.2 |  |

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