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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) | 2023 |  | 2022
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 |
Total | 836.1 |  |  | 846.4 |
Unsecured revolving credit facility | 230.0 |  |  | 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 debt | 4.7 | % |  | 4.2 | %
Weighted average term of available Long-term debt | 4.0 years |  | 5.0 years
Fair value of Senior unsecured notes (Level 1) | $ | 785.2 |  |  | $ | 845.1 |

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