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Trade and other receivables (Tables)
 12 Months Ended
Dec. 31, 2017
Trade and other receivables [abstract]  
Schedule of trade and other receivable
 
 
December 31, 2017
 
December 31, 2016
 
 
 
$M
 
$M
 
 
Non-current Assets
 

 
 

 
 
Derivative financial instruments
0.3

 
0.3

 
 
 
0.3

 
0.3

 
 
Current Assets
 

 
 

 
 
Trade receivables
54.0

 
40.5

 
 
Amounts owed by joint ventures and associates
1.8

 
2.8

 
 
Other receivables
4.2

 
3.1

 
 
Prepayments and accrued income
10.5

 
9.4

 
 
Derivative financial instruments
2.1

 
1.8

 
 
 
72.6

 
57.6

 
Schedule of movements in provision for impairment of trade receivable and amounts owed by joint ventures and associates
Movements in the provision for impairment of trade receivables and amounts owed by joint ventures and associates were as follows:
 
 
2017
 
2016
 
 
 
$M
 
$M
 
 
At January 1
2.1

 
4.8

 
 
Charge in the year
2.7

 
1.3

 
 
Utilized in the year
(0.8
)
 
(3.6
)
 
 
Exchange difference
0.1

 
(0.4
)
 
 
At December 31
4.1

 
2.1