XML 135 R116.htm IDEA: XBRL DOCUMENT v3.8.0.1
Provisions - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of other provisions [line items]      
Provisions $ 3.9 $ 2.6 $ 5.3
Rationalization and redundancy      
Disclosure of other provisions [line items]      
Provisions 2.1 0.8 2.6
Rationalization and redundancy | Gas Cylinders      
Disclosure of other provisions [line items]      
Provisions 0.8 0.5  
Rationalization and redundancy | Elektron      
Disclosure of other provisions [line items]      
Provisions 1.3 0.3  
Rationalization and redundancy | Elektron | United Kingdom      
Disclosure of other provisions [line items]      
Provisions 0.2    
Rationalization and redundancy | Elektron | U.S.      
Disclosure of other provisions [line items]      
Provisions 0.1    
Rationalization of Magtech operations | Elektron      
Disclosure of other provisions [line items]      
Provisions 0.5    
Onerous contracts provision | Elektron      
Disclosure of other provisions [line items]      
Provisions 0.6    
Employee benefits      
Disclosure of other provisions [line items]      
Provisions 1.1 1.1 1.5
Environmental provisions      
Disclosure of other provisions [line items]      
Provisions 0.7 $ 0.7 $ 1.2
Speciality Metals business of ESM Group Inc | Environmental provisions      
Disclosure of other provisions [line items]      
Provisions $ 0.4