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Long-Term Debt (Tables)
12 Months Ended
Mar. 31, 2022
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
31 March
(Millions of US dollars)20222021
Senior unsecured notes:
Principal amount 3.625% notes due 2026 (€400.0 million)
$446.4 $468.3 
Principal amount 5.000% notes due 2028
400.0 400.0 
Total846.4 868.3 
Unsecured revolving credit facility40.0 — 
Unamortized debt issuance costs:(9.1)(9.7)
Total Long-term debt$877.3 $858.6 
Weighted average interest rate of Long-term debt4.2 %4.3 %
Weighted average term of available Long-term debt
5.0 years
4.5 years
Fair value of Senior unsecured notes (Level 1)
$845.1 $904.7