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Inventories (Tables)
12 Months Ended
Mar. 31, 2024
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories consist of the following components:
 31 March
(Millions of US dollars)20242023
Finished goods$235.4 $237.8 
Work-in-process25.1 23.0 
Raw materials and supplies90.6 93.9 
Provision for obsolete finished goods and raw materials(13.3)(10.5)
Total inventories$337.8 $344.2