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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Restructuring and Related Activities [Abstract]      
Beginning Balance $ 34.1 $ 32.4  
Charge for the period 2.1 1.4  
Utilized in the period (0.6) (1.2)  
Released in the period 0.0 (1.0)  
Reclassify liabilities held for sale (0.3) 0.0  
Exchange effect (0.3) 0.0  
Ending Balance 35.0 31.6  
Due within one year (5.1) (4.8) $ (5.7)
Due after one year $ 29.9 $ 26.8