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Leases (Tables)
 12 Months Ended
Mar. 31, 2022
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)20222021
Assets:
Operating leases, net$57.8 $46.4 
Finance leases, net2.3 2.7 
Total right-of-use assets$60.1 $49.1 
Liabilities:
Operating leases:
Current$12.5 $7.8 
Non-Current63.1 53.3 
Total operating lease liabilities$75.6 $61.1 
Finance leases:
Current$1.1 $1.0 
Non-Current1.5 1.9 
Total finance lease liabilities$2.6 $2.9 
Total lease liabilities$78.2 $64.0 
Schedule of Lease Expense
The following table represents the Company's lease expense:
Years Ended 31 March
(Millions of US dollars)202220212020
Operating leases$21.6 $17.0 $18.4 
Short-term leases1.7 2.1 1.0 
Variable leases— — 0.1 
Finance leases1.0 0.9 0.3 
Interest on lease liabilities0.1 0.1 0.1 
Total lease expense$24.4 $20.1 $19.9 
Supplemental cash flow and other information related to leases were as follows:
Years Ended 31 March
(Millions of US dollars)20222021
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases$23.8 $19.2 
Operating cash flows used for finance leases0.1 0.1 
Financing cash flows used for finance leases1.0 0.8 
Non-cash ROU assets obtained in exchange for new lease liabilities31.8 26.0 
Non-cash remeasurements reducing ROU assets and lease liabilities1.3 (5.1)
Schedule of Weighted-Average Remaining Lease Term and Discount Rate
The weighted-average remaining lease term of the Company's leases is as follows:
31 March
(In Years)20222021
Operating leases8.07.8
Finance leases3.23.5

The weighted-average discount rate of the Company's leases is as follows:
31 March
20222021
Operating leases4.3 %4.6 %
Finance leases4.1 %4.5 %
Operating Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2022:
Years ended 31 March (Millions of US dollars):Operating
Leases		Finance
Leases		Total
2023$14.6 $1.1 $15.7 
202415.7 0.6 16.3 
202511.3 0.5 11.8 
20269.5 0.3 9.8 
20275.7 — 5.7 
Thereafter37.4 — 37.4 
Total$94.2 $2.5 $96.7 
Less: imputed interest18.5 
Total lease liabilities$78.2 
Finance Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2022:
Years ended 31 March (Millions of US dollars):Operating
Leases		Finance
Leases		Total
2023$14.6 $1.1 $15.7 
202415.7 0.6 16.3 
202511.3 0.5 11.8 
20269.5 0.3 9.8 
20275.7 — 5.7 
Thereafter37.4 — 37.4 
Total$94.2 $2.5 $96.7 
Less: imputed interest18.5 
Total lease liabilities$78.2