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Inventories - Components of Inventories (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018
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Inventory Disclosure [Abstract] |  |
Finished goods | $ 235.0 | $ 190.3
Work-in-process | 7.3 | 8.1
Raw materials and supplies | 88.8 | 65.3
Provision for obsolete finished goods and raw materials | (13.7) | (8.0)
Total inventories | $ 317.4 | $ 255.7

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