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Long-Term Debt (Tables)

12 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

(Millions of US dollars)			31 March 2021						31 March 2020
Senior unsecured notes:
Principal amount 4.750% notes due 2025			$	—					$	400.0
Principal amount 3.625% notes due 2026 (€400.0 million)			468.3						440.7
Principal amount 5.000% notes due 2028			400.0						400.0
Total			868.3						1,240.7
Unsecured revolving credit facility			—						130.0
Unamortized debt issuance costs:
Principal amount 4.750% notes due 2025			—						(4.3)
Principal amount 3.625% notes due 2026 (€400.0 million)			(4.2)						(5.0)
Principal amount 5.000% notes due 2028			(4.3)						(4.9)
Unsecured revolving credit facility			(1.2)						(1.9)
Total Long-term debt			$	858.6					$	1,354.6
Weighted average interest rate of Long-term debt			4.3		%				4.3		%
Weighted average term of available Long-term debt			4.5 years						5.3 years
Fair value of Senior unsecured notes (Level 1)			$	904.7					$	1,147.7

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- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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