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Leases (Tables)
 12 Months Ended
Mar. 31, 2021
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)20212020
Assets:
Operating leases, net$46.4 $40.5 
Finance leases, net2.7 1.7 
Total right-of-use assets$49.1 $42.2 
Liabilities:
Operating leases:
Current$7.8 $14.3 
Non-Current53.3 41.4 
Total operating lease liabilities$61.1 $55.7 
Finance leases:
Current$1.0 $0.5 
Non-Current1.9 1.5 
Total finance lease liabilities$2.9 $2.0 
Total lease liabilities$64.0 $57.7 
Schedule of Lease Expense
The following table represents the Company's lease expense:
Years Ended 31 March
(Millions of US dollars)20212020
Operating leases$17.0 $18.4 
Short-term leases2.1 1.0 
Variable leases— 0.1 
Finance leases0.9 0.3 
Interest on lease liabilities0.1 0.1 
Total lease expense$20.1 $19.9 
Supplemental cash flow and other information related to leases were as follows:
Years Ended 31 March
(Millions of US dollars)20212020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases$19.2 $18.0 
Operating cash flows used for finance leases0.1 0.1 
Financing cash flows used for finance leases0.8 0.4 
Non-cash ROU assets obtained in exchange for new lease liabilities26.0 12.9 
Non-cash remeasurements reducing ROU assets and lease liabilities(5.1)(19.4)
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)20212020
Operating leases7.85.4
Finance leases3.54.4

The weighted-average discount rate of the Company's leases is as follows:
31 March
20212020
Operating leases4.6 %4.4 %
Finance leases4.5 %4.4 %
Operating Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2021:
Years ended 31 March (Millions of US dollars):Operating
Leases		Finance
Leases		Total
2022$9.6 $1.0 $10.6 
202314.3 1.0 15.3 
202410.5 0.5 11.0 
20257.2 0.3 7.5 
20266.1 0.2 6.3 
Thereafter30.9 — 30.9 
Total$78.6 $3.0 $81.6 
Less: imputed interest17.6 
Total lease liabilities$64.0 
Finance Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2021:
Years ended 31 March (Millions of US dollars):Operating
Leases		Finance
Leases		Total
2022$9.6 $1.0 $10.6 
202314.3 1.0 15.3 
202410.5 0.5 11.0 
20257.2 0.3 7.5 
20266.1 0.2 6.3 
Thereafter30.9 — 30.9 
Total$78.6 $3.0 $81.6 
Less: imputed interest17.6 
Total lease liabilities$64.0