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Provisions (Tables)
 12 Months Ended
Dec. 31, 2017
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Disclosure of other provisions
 
 
Rationalization
and
redundancy
 
Employee
benefits
 
Environmental
provisions
 
Total
 
 
 
$M
 
$M
 
$M
 
$M
 
 
At January 1, 2016
2.6

 
1.5

 
1.2

 
5.3

 
 
Charged to consolidated income statement
1.4

 
—

 
—

 
1.4

 
 
Credited to consolidated income statement
(0.2
)
 
(0.4
)
 
—

 
(0.6
)
 
 
Cash payments
(3.0
)
 
—

 
(0.3
)
 
(3.3
)
 
 
Translation
—

 
—

 
(0.2
)
 
(0.2
)
 
 
At December 31, 2016
0.8

 
1.1

 
0.7

 
2.6

 
 
Charged to consolidated income statement
4.3

 
0.5

 
0.4

 
5.2

 
 
Credited to consolidated income statement
—

 
—

 
(0.4
)
 
(0.4
)
 
 
Cash payments
(3.0
)
 
(0.5
)
 
—

 
(3.5
)
 
 
At December 31, 2017
2.1

 
1.1

 
0.7

 
3.9

 
 
 
 
 
 
 
 
 
 
 
 
At December 31, 2017
 

 
 

 
 

 
 
 
 
Included in current liabilities
2.1

 
—

 
0.7

 
2.8

 
 
Included in non-current liabilities
—

 
1.1

 
—

 
1.1

 
 
 
2.1

 
1.1

 
0.7

 
3.9

 
 
At December 31, 2016
 

 
 

 
 

 
 
 
 
Included in current liabilities
0.8

 
—

 
0.7

 
1.5

 
 
Included in non-current liabilities
—

 
1.1

 
—

 
1.1

 
 
 
0.8

 
1.1

 
0.7

 
2.6