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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Rollforward of Goodwill
The following are the changes in the carrying value of goodwill:
(Millions of US dollars)Europe Building Products
Balance - 31 March 2023
$194.9 
Foreign exchange impact(2.3)
Balance - 31 March 2024
$192.6 
Foreign exchange impact1.1 
Balance - 31 March 2025
$193.7 
Schedule of Indefinite-Lived Intangible Assets
The following are the net carrying amount of indefinite lived intangible assets other than goodwill:
 31 March
(Millions of US dollars)20252024
Trade names$111.6 $111.0 
Other7.4 7.4 
Total$119.0 $118.4 
Schedule of Finite-Lived Intangible Assets
The following are the net carrying amount of amortizable intangible assets:
31 March 2025
(Millions of US dollars)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer Relationships$47.5 $(20.9)$26.6 
Total$47.5 $(20.9)$26.6 
31 March 2024
(Millions of US dollars)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer Relationships$47.3 $(16.5)$30.8 
Total$47.3 $(16.5)$30.8 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
At 31 March 2025, the estimated future amortization of intangible assets is as follows:
Years ended 31 March (Millions of US dollars):
2026$4.6 
20274.9 
20285.0 
20294.6 
20304.3