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Leases (Tables)
 12 Months Ended
Mar. 31, 2023
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)20232022
Assets:
Operating leases, net$59.4 $57.8 
Finance leases, net2.0 2.3 
Total right-of-use assets$61.4 $60.1 
Liabilities:
Operating leases:
Current$18.1 $12.5 
Non-Current61.1 63.1 
Total operating lease liabilities$79.2 $75.6 
Finance leases:
Current$0.8 $1.1 
Non-Current1.4 1.5 
Total finance lease liabilities$2.2 $2.6 
Total lease liabilities$81.4 $78.2 
Schedule of Lease Expense
The following table represents the Company's lease expense:
Years Ended 31 March
(Millions of US dollars)202320222021
Operating leases$20.2 $21.6 $17.0 
Short-term leases3.2 1.7 2.1 
Finance leases1.4 1.0 0.9 
Interest on lease liabilities0.2 0.1 0.1 
Total lease expense$25.0 $24.4 $20.1 
Supplemental cash flow and other information related to leases were as follows:
Years Ended 31 March
(Millions of US dollars)20232022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases$20.9 $23.8 
Operating cash flows used for finance leases0.2 0.1 
Financing cash flows used for finance leases1.5 1.0 
Non-cash ROU assets obtained in exchange for new lease liabilities16.8 31.8 
Non-cash remeasurements increasing ROU assets and lease liabilities5.7 1.3 
Schedule of Lease Expense
The weighted-average remaining lease term of the Company's leases is as follows:
31 March
(In Years)20232022
Operating leases7.98.0
Finance leases3.13.2

The weighted-average discount rate of the Company's leases is as follows:
31 March
20232022
Operating leases4.6 %4.3 %
Finance leases4.3 %4.1 %
Operating Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2023:
Years ended 31 March (Millions of US dollars):
Operating
Leases		Finance
Leases		Total
2024$20.2 $0.8 $21.0 
202515.4 0.7 16.1 
202611.8 0.5 12.3 
20277.4 0.1 7.5 
20286.7 — 6.7 
Thereafter35.9 — 35.9 
Total$97.4 $2.1 $99.5 
Less: imputed interest18.1 
Total lease liabilities$81.4 
Finance Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2023:
Years ended 31 March (Millions of US dollars):
Operating
Leases		Finance
Leases		Total
2024$20.2 $0.8 $21.0 
202515.4 0.7 16.1 
202611.8 0.5 12.3 
20277.4 0.1 7.5 
20286.7 — 6.7 
Thereafter35.9 — 35.9 
Total$97.4 $2.1 $99.5 
Less: imputed interest18.1 
Total lease liabilities$81.4