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Leases (Tables)
 12 Months Ended
Mar. 31, 2025
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)20252024
Assets:
Operating leases, net$70.4 $60.9 
Finance leases, net2.7 3.0 
Total right-of-use assets$73.1 $63.9 
Liabilities:
Operating leases:
Current$21.6 $19.0 
Non-Current63.9 59.4 
Total operating lease liabilities$85.5 $78.4 
Finance leases:
Current$1.1 $1.2 
Non-Current1.9 2.1 
Total finance lease liabilities$3.0 $3.3 
Total lease liabilities$88.5 $81.7 
Schedule of Lease Expense
The following table represents the Company’s lease expense:
Years Ended 31 March
(Millions of US dollars)202520242023
Operating leases$25.1 $22.3 $20.2 
Short-term leases6.6 4.6 3.2 
Finance leases1.2 1.1 1.4 
Interest on lease liabilities0.2 0.2 0.2 
Total lease expense$33.1 $28.2 $25.0 
Supplemental cash flow and other information related to leases were as follows:
Years Ended 31 March
(Millions of US dollars)20252024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases$27.4 $24.3 
Operating cash flows used for finance leases0.2 0.2 
Financing cash flows used for finance leases1.2 1.1 
Non-cash ROU assets obtained in exchange for new lease liabilities34.3 26.0 
Non-cash remeasurements decreasing ROU assets and lease liabilities(0.7)(3.6)
Schedule of Lease Expense
The weighted-average remaining lease term of the Company’s leases is as follows:
31 March
(In Years)20252024
Operating leases6.37.1
Finance leases3.23.4

The weighted-average discount rate of the Company’s leases is as follows:
31 March
20252024
Operating leases5.8 %5.4 %
Finance leases6.2 %5.6 %
Operating Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2025:
Years ended 31 March (Millions of US dollars):
Operating
Leases		Finance
Leases		Total
2026$25.3 $1.2 $26.5 
202719.3 0.8 20.1 
202815.9 0.6 16.5 
202910.7 0.4 11.1 
20306.6 0.1 6.7 
Thereafter25.2 — 25.2 
Total$103.0 $3.1 $106.1 
Less: imputed interest17.6 
Total lease liabilities$88.5 
Finance Lease, Future Lease Payments
The following are future lease payments for non-cancellable leases at 31 March 2025:
Years ended 31 March (Millions of US dollars):
Operating
Leases		Finance
Leases		Total
2026$25.3 $1.2 $26.5 
202719.3 0.8 20.1 
202815.9 0.6 16.5 
202910.7 0.4 11.1 
20306.6 0.1 6.7 
Thereafter25.2 — 25.2 
Total$103.0 $3.1 $106.1 
Less: imputed interest17.6 
Total lease liabilities$88.5