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Long-Term Debt (Tables)
12 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
31 March
(Millions of US dollars)20232022
Senior unsecured notes:
Principal amount 3.625% notes due 2026 (€400.0 million)
$436.1 $446.4 
Principal amount 5.000% notes due 2028
400.0 400.0 
Total836.1 846.4 
Unsecured revolving credit facility230.0 40.0 
Unamortized debt issuance costs:(7.1)(9.1)
Total Long-term debt$1,059.0 $877.3 
Weighted average interest rate of Long-term debt4.7 %4.2 %
Weighted average term of available Long-term debt4.0 years5.0 years
Fair value of Senior unsecured notes (Level 1)
$785.2 $845.1