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Derivative Instruments
12 Months Ended
Mar. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments Derivative Instruments
Foreign Currency Forward Contracts
The Company’s foreign currency forward contracts are valued using models that maximize the use of market observable inputs including interest rate curves and both forward and spot prices for currencies and are categorized as Level 2 within the fair value hierarchy.
Derivative Balances
The following table sets forth the total outstanding notional amount and the fair value of the Company’s derivative instruments held at 31 March 2023 and 2022:
Fair Value as of
(Millions of US dollars)Notional Amount31 March 202331 March 2022
Derivatives not accounted for as hedges31 March 202331 March 2022AssetsLiabilitiesAssetsLiabilities
Foreign currency forward contracts$269.0 $251.0 $2.2 $11.4 $2.0 $1.9 
The following table sets forth the gain and loss on the Company’s foreign currency forward contracts recorded in the Company's consolidated statements of operations and comprehensive income as follows:
31 March
(Millions of US dollars)202320222021
Asbestos adjustments loss (gain)$24.5 $5.3 $(11.7)
Selling, general and administrative expenses4.0 (2.1)7.2 
Total loss (gain)$28.5 $3.2 $(4.5)