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Property, Plant and Equipment
 3 Months Ended
Jun. 30, 2026
Property, Plant, and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment consist of the following components:
June 30,March 31,
(Millions of U.S. dollars)20262026
Land$122.8 $121.7 
Buildings1,040.4 995.2 
Machinery and equipment3,395.8 3,203.3 
Construction in progress376.3 555.1 
Property, plant and equipment, at cost4,935.3 4,875.3 
Less accumulated depreciation(1,883.9)(1,790.7)
Property, plant and equipment, net$3,051.4 $3,084.6 
Depreciation expense for the three months ended June 30, 2026 and 2025 was $87.6 million and $55.2 million, respectively.