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Capital Management (Tables)
 12 Months Ended
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 DateRecord DatePayment Date
FY 2022 second half dividend0.30129.617 May 202227 May 202229 July 2022
FY 2022 first half dividend0.40174.19 November 202119 November 202117 December 2021
FY 2021 special dividend0.70309.910 February 202119 February 202130 April 2021
Schedule of Stock Activity Below is the activity under this program:
In Millions, except price per shareTotal 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 20221.6$19.341.6$168.8
1 January 2023 - 31 January 2023—$——$168.8
1 February 2023 - 28 February 20231.1$21.721.1$144.3
1 March 2023 - 31 March 20231.1$20.781.1$121.6
Total as of 31 March 2023
3.83.8$121.6