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Inventories (Tables)
12 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Components of Inventories
Inventories consist of the following components:
 31 March
(Millions of US dollars)20212020
Finished goods$149.9 $224.4 
Work-in-process17.9 25.2 
Raw materials and supplies60.4 69.9 
Provision for obsolete finished goods and raw materials(9.9)(14.4)
Total inventories$218.3 $305.1