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Accounts and Other Receivables (Tables)
 12 Months Ended
Mar. 31, 2018
Receivables [Abstract]  
Components of Accounts and Other Receivables
Accounts and other receivables consist of the following components:
 
31 March
(Millions of US dollars)
2018
 
2017
Trade receivables
$
196.9

 
$
194.5

Other receivables and advances
7.1

 
5.9

Provision for doubtful trade debts
(1.3
)
 
(0.9
)
Total accounts and other receivables
$
202.7

 
$
199.5
Provision for Doubtful Trade Debts
The following are changes in the provision for doubtful trade debts:
 
31 March
(Millions of US dollars)
2018
 
2017
 
2016
Balance at beginning of period
$
0.9

 
$
1.1

 
$
0.8

Adjustment to provision
0.6

 
(0.1
)
 
0.5

Write-offs, net of recoveries
(0.2
)
 
(0.1
)
 
(0.2
)
Balance at end of period
$
1.3

 
$
0.9

 
$
1.1