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Provisions - Summary of Legal Claims and Other Costs (Parenthetical) (Detail)
€ in Millions
12 Months Ended
Dec. 31, 2017
EUR (€)
Claim
Dec. 31, 2016
EUR (€)
Claim
Dec. 31, 2015
EUR (€)
Disclosure of other provisions [line items]      
Provisions € 153.0 € 149.0 € 163.0
Legal claims and other costs [member]      
Disclosure of other provisions [line items]      
Provisions € 67.0 56.0 € 67.0
Expected provisions settlement period Five years    
Legal claims and other costs [member] | General equipment maintenance [member]      
Disclosure of other provisions [line items]      
Provisions € 3.0 3.0  
Legal claims and other costs [member] | Customer litigation, product warranties and guarantees [member]      
Disclosure of other provisions [line items]      
Provisions 16.0 7.0  
Legal claims and other costs [member] | Late delivery penalties [member]      
Disclosure of other provisions [line items]      
Provisions € 6.0 € 4.0  
Disease claims [member]      
Disclosure of other provisions [line items]      
Number of cases outstanding for disease claims | Claim 7 11  
Disease claims [member] | Bottom of range [member]      
Disclosure of other provisions [line items]      
Latency period for acquiring diseases 25 years    
Disease claims [member] | Top of range [member]      
Disclosure of other provisions [line items]      
Latency period for acquiring diseases 40 years    
Average amount per claim outstanding   € 0.1  
Average settlement amount per claim € 0.1 € 0.1