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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2024
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 2022
$199.5 
Foreign exchange impact(4.6)
Balance - 31 March 2023
$194.9 
Foreign exchange impact(2.3)
Balance - 31 March 2024
$192.6 
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)20242023
Trade names$111.0 $112.3 
Other7.4 7.4 
Total$118.4 $119.7 
Schedule of Finite-Lived Intangible Assets
The following are the net carrying amount of amortizable intangible assets:
Year Ended 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 
Year Ended 31 March 2023
(Millions of US dollars)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer Relationships$47.9 $(12.4)$35.5 
Total$47.9 $(12.4)$35.5 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
At 31 March 2024, the estimated future amortization of intangible assets is as follows:
Years ended 31 March (Millions of US dollars):
2025$4.4 
20264.6 
20274.8 
20284.9 
20294.6