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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2022
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 2020$196.9 
Foreign exchange impact12.4 
Balance - 31 March 2021$209.3 
Foreign exchange impact(9.8)
Balance - 31 March 2022$199.5 
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)20222021
Tradenames$115.0 $120.6 
Other7.4 7.4 
Total$122.4 $128.0 
Schedule of Finite-Lived Intangible Assets
The following are the net carrying amount of amortizable intangible assets:
Year Ended 31 March 2022
(Millions of US dollars)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer Relationships$52.9 $(12.5)$40.4 
Total$52.9 $(12.5)$40.4 
Year Ended 31 March 2021
(Millions of US dollars)Gross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer Relationships$55.2 $(9.3)$45.9 
Other10.9 (10.9)— 
Total$66.1 $(20.2)$45.9 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
At 31 March 2022, the estimated future amortization of intangible assets is as follows:
Years ended 31 March (Millions of US dollars):
2023$4.1 
2024$4.4 
2025$4.6 
2026$4.7 
2027$5.0