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Product Warranties
 12 Months Ended
Mar. 31, 2025
Guarantees [Abstract]  
Product Warranties Product Warranties
The following are the changes in the product warranty accrual:
 31 March
(Millions of US dollars)202520242023
Balance at beginning of period$36.2 $35.6 $37.7 
Charges to cost of goods sold3.9 3.9 1.2 
Settlements made in cash or in kind(5.9)(3.3)(3.3)
Balance at end of period$34.2 $36.2 $35.6