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Inventories (Tables)
12 Months Ended
Mar. 31, 2022
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories consist of the following components:
 31 March
(Millions of US dollars)20222021
Finished goods$187.3 $149.9 
Work-in-process16.2 17.9 
Raw materials and supplies82.1 60.4 
Provision for obsolete finished goods and raw materials(5.9)(9.9)
Total inventories$279.7 $218.3