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Property, Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2024
Property, Plant and Equipment [Abstract]  
Components of Property, Plant and Equipment
Property, plant and equipment consist of the following components:
 31 March
(Millions of US dollars)20242023
Land$99.0 $79.8 
Buildings577.4 568.1 
Machinery and equipment2,149.9 2,044.2 
Construction in progress675.3 502.6 
Property, plant and equipment, at cost3,501.6 3,194.7 
Less accumulated depreciation(1,463.8)(1,355.1)
Property, plant and equipment, net$2,037.8 $1,839.6