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Plant Closure Provisions - Movements in Plant Closure and Restructuring Provisions (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]      
Beginning Balance $ 30.4 $ 28.6 $ 27.5
Charge for the period 3.9 4.2 5.1
Utilized in the period (2.0) (2.7) (3.8)
Exchange effect 0.1 0.3 (0.2)
Ending Balance 32.4 30.4 28.6
Due within one year (6.2) (5.1) (4.1)
Due after one year 26.2 25.3 24.5
Severance [Member]
      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 1.1 1.5 1.5
Charge for the period 0 0.2 0.7
Utilized in the period (0.1) (0.6) (0.7)
Exchange effect 0 0 0
Ending Balance 1.0 1.1 1.5
Due within one year 0 (0.1) (0.5)
Due after one year 1.0 1.0 1.0
Other Restructuring [Member]
      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 0 0 0.1
Charge for the period 0 0 (0.1)
Utilized in the period 0 0 0
Exchange effect 0 0 0
Ending Balance 0 0 0
Due within one year 0 0 0
Due after one year 0 0 0
Remediation [Member]
      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 29.3 27.1 25.9
Charge for the period 3.9 4.0 4.5
Utilized in the period (1.9) (2.1) (3.1)
Exchange effect 0.1 0.3 (0.2)
Ending Balance 31.4 29.3 27.1
Due within one year (6.2) (5.0) (3.6)
Due after one year $ 25.2 $ 24.3 $ 23.5