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Accumulated Other Comprehensive Loss (Tables)
12 Months Ended
Mar. 31, 2023
Equity [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss is comprised of the following at 31 March 2023:
(Millions of US dollars)Cash Flow
Hedges
Pension
Actuarial
(Loss) Gain
Foreign
Currency
Translation
Adjustments
Total
Balance at 31 March 2022
$0.2 $(0.3)$(21.9)$(22.0)
Other comprehensive gain (loss)— 2.1 (33.4)(31.3)
Balance at 31 March 2023
$0.2 $1.8 $(55.3)$(53.3)