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Dividends (Tables)
 12 Months Ended
Mar. 31, 2021
Dividends [Abstract]  
Summary of Dividends Declared or Paid
The following table summarizes the dividends declared or paid during the fiscal years 2021, 2020 and 2019:
(Millions of US dollars)US
Cents/Security		US$ Millions
Total Amount		Announcement DateRecord DatePayment Date
FY 2021 special dividend0.70309.610 February 202119 February 202130 April 2021
FY 2020 first half dividend 1
0.1044.77 November 201918 November 201920 December 2019
FY 2019 second half dividend0.26113.921 May 20196 June 20192 August 2019
FY 2019 first half dividend0.1043.68 November 201812 December 201822 February 2019
FY 2018 second half dividend0.30128.522 May 20187 June 20183 August 2018