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Inventories
12 Months Ended
Mar. 31, 2025
Inventory Disclosure [Abstract]  
Inventories Inventories
Inventories consist of the following components:
 31 March
(Millions of US dollars)20252024
Finished goods$243.9 $235.4 
Work-in-process26.5 25.1 
Raw materials and supplies87.4 90.6 
Provision for obsolete finished goods and raw materials(10.7)(13.3)
Total$347.1 $337.8