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Accounts and Other Receivables (Tables)
12 Months Ended
Mar. 31, 2021
Receivables [Abstract]  
Components of Accounts and Other Receivables
Accounts and other receivables consist of the following components:
 31 March
(Millions of US dollars)20212020
Trade receivables$296.7 $268.4 
Income taxes receivable25.4 84.7 
Other receivables and advances17.2 14.6 
Provision for doubtful trade receivables(6.1)(4.4)
Total accounts and other receivables$333.2 $363.3 
Provision for Doubtful Trade Debts
The following are changes in the provision for doubtful trade receivables:
 31 March
(Millions of US dollars)202120202019
Balance at beginning of period$4.4 $2.9 $1.3 
Adjustment to provision3.1 1.7 2.8 
Write-offs, net of recoveries(1.4)(0.2)(1.2)
Balance at end of period$6.1 $4.4 $2.9