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Product Warranties
 12 Months Ended
Mar. 31, 2023
Guarantees [Abstract]  
Product Warranties Product Warranties
The Company offers various warranties on its products, including a 30-year limited warranty on certain fiber cement siding products in the United States. A typical warranty program requires the Company to replace defective products within a specified time period from the date of sale. It is possible that future warranty costs could differ from those estimates.
The following are the changes in the product warranty provision:
 31 March
(Millions of US dollars)202320222021
Balance at beginning of period$37.7 $39.6 $42.4 
Increase in accrual1.2 1.9 2.4 
Settlements made in cash or in kind(3.3)(3.8)(5.2)
Balance at end of period$35.6 $37.7 $39.6