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Leases (Tables)
 12 Months Ended
Mar. 31, 2024
Leases [Abstract]  
Schedule of ROU Assets and Lease Liabilities
The following table represents the Company’s ROU assets and lease liabilities:
31 March
(Millions of US dollars)20242023
Assets:
Operating leases, net$60.9 $59.4 
Finance leases, net3.0 2.0 
Total right-of-use assets$63.9 $61.4 
Liabilities:
Operating leases:
Current$19.0 $18.1 
Non-Current59.4 61.1 
Total operating lease liabilities$78.4 $79.2 
Finance leases:
Current$1.2 $0.8 
Non-Current2.1 1.4 
Total finance lease liabilities$3.3 $2.2 
Total lease liabilities$81.7 $81.4 
Schedule of Lease Expense
The following table represents the Company’s lease expense:
Years Ended 31 March
(Millions of US dollars)202420232022
Operating leases$22.3 $20.2 $21.6 
Short-term leases4.6 3.2 1.7 
Finance leases1.1 1.4 1.0 
Interest on lease liabilities0.2 0.2 0.1 
Total lease expense$28.2 $25.0 $24.4 
Supplemental cash flow and other information related to leases were as follows:
Years Ended 31 March
(Millions of US dollars)20242023
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases$24.3 $20.9 
Operating cash flows used for finance leases0.2 0.2 
Financing cash flows used for finance leases1.1 1.5 
Non-cash ROU assets obtained in exchange for new lease liabilities26.0 16.8 
Non-cash remeasurements (decreasing) increasing ROU assets and lease liabilities(3.6)5.7 
Schedule of Lease Expense
The weighted-average remaining lease term of the Company’s leases is as follows:
31 March
(In Years)20242023
Operating leases7.17.9
Finance leases3.43.1

The weighted-average discount rate of the Company’s leases is as follows:
31 March
20242023
Operating leases5.4 %4.6 %
Finance leases5.6 %4.3 %
Operating Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2024:
Years ended 31 March (Millions of US dollars):
Operating
Leases		Finance
Leases		Total
2025$21.6 $1.3 $22.9 
202618.1 1.0 19.1 
202711.2 0.6 11.8 
20288.4 0.4 8.8 
20296.4 0.2 6.6 
Thereafter30.1 — 30.1 
Total$95.8 $3.5 $99.3 
Less: imputed interest17.6 
Total lease liabilities$81.7 
Finance Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2024:
Years ended 31 March (Millions of US dollars):
Operating
Leases		Finance
Leases		Total
2025$21.6 $1.3 $22.9 
202618.1 1.0 19.1 
202711.2 0.6 11.8 
20288.4 0.4 8.8 
20296.4 0.2 6.6 
Thereafter30.1 — 30.1 
Total$95.8 $3.5 $99.3 
Less: imputed interest17.6 
Total lease liabilities$81.7