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Property, Plant and Equipment
 12 Months Ended
Mar. 31, 2025
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment consist of the following components:
 31 March
(Millions of US dollars)20252024
Land$94.7 $99.0 
Buildings747.0 577.4 
Machinery and equipment2,316.2 2,149.9 
Construction in progress532.0 675.3 
Property, plant and equipment, at cost3,689.9 3,501.6 
Less accumulated depreciation(1,520.9)(1,463.8)
Property, plant and equipment, net$2,169.0 $2,037.8 
Depreciation expense for the fiscal years ended 31 March 2025, 2024 and 2023 was US$211.3 million, US$178.7 million and US$166.8 million, respectively.