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Inventories - Components of Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Inventory Disclosure [Abstract]
Finished goods	$ 149.9	$ 224.4
Work-in-process	17.9	25.2
Raw materials and supplies	60.4	69.9
Provision for obsolete finished goods and raw materials	(9.9)	(14.4)
Total inventories	$ 218.3	$ 305.1

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount of valuation reserve for inventory.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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