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Accounts and Other Receivables (Tables)
 12 Months Ended
Mar. 31, 2020
Receivables [Abstract]  
Components of Accounts and Other Receivables
Accounts and other receivables consist of the following components:
 
31 March
(Millions of US dollars)
2020
 
2019
Trade receivables
$
268.4

 
$
245.5

Income taxes receivable
84.7

 
—

Other receivables and advances
14.6

 
12.0

Provision for doubtful trade receivables
(4.4
)
 
(2.9
)
Total accounts and other receivables
$
363.3

 
$
254.6
Provision for Doubtful Trade Debts
The following are changes in the provision for doubtful trade receivables:
 
31 March
(Millions of US dollars)
2020
 
2019
 
2018
Balance at beginning of period
$
2.9

 
$
1.3

 
$
0.9

Adjustment to provision
1.7

 
2.8

 
0.6

Write-offs, net of recoveries
(0.2
)
 
(1.2
)
 
(0.2
)
Balance at end of period
$
4.4

 
$
2.9

 
$
1.3