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Capital Management (Tables) | 12 Months Ended
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Mar. 31, 2023
Dividends [Abstract] |
Summary of Dividends Declared or Paid | The following table summarizes the dividends declared or paid during the fiscal years 2023, 2022 and 2021:
(Millions of US dollars) | US Cents/Security |  | US$ Millions Total Amount Paid |  | Announcement Date |  | Record Date |  | Payment Date
FY 2022 second half dividend | 0.30 |  | 129.6 |  | 17 May 2022 |  | 27 May 2022 |  | 29 July 2022
FY 2022 first half dividend | 0.40 |  | 174.1 |  | 9 November 2021 |  | 19 November 2021 |  | 17 December 2021
FY 2021 special dividend | 0.70 |  | 309.9 |  | 10 February 2021 |  | 19 February 2021 |  | 30 April 2021
Schedule of Stock Activity | Below is the activity under this program:
In Millions, except price per share | Total Number of Shares Purchased | Average Price Paid per Share (US$) | Total Number of Shares Purchased as Part of Publicly Announced Program | Maximum Dollar Value of Shares That May Yet be Purchased Under the Program (US$)
1 December 2022 - 31 December 2022 | 1.6 | $19.34 | 1.6 | $168.8
1 January 2023 - 31 January 2023 | — | $— | — | $168.8
1 February 2023 - 28 February 2023 | 1.1 | $21.72 | 1.1 | $144.3
1 March 2023 - 31 March 2023 | 1.1 | $20.78 | 1.1 | $121.6
Total as of 31 March 2023 | 3.8 |  | 3.8 | $121.6

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