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Commitments and Contingencies - Rollforward of Environmental Liability and Related Assets (Detail) (Environmental Related Matters [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Environmental Related Matters [Member]
      
Environmental Liability And Related Assets [Line items]      
Environmental liability - Beginning balance $ 99.7 $ 101.8  
Continuing operations, Liability 13.0 7.1  
Discontinued operations, Liability 0.5 (1.4)  
Accruals added during the period for new matters, Liability        
Net cash activity, Liability (11.4) (11.5)  
Foreign currency, Liability   0.1  
Environmental liability - Ending balance 101.8 96.1 101.8
Environmental liability - Asset, Beginning balance        
Continuing operations, Asset   10.8  
Discontinued operations, Asset   1.5  
Accruals added during the period for new matters, Asset        
Net cash activity, Asset        
Foreign currency, Asset        
Environmental liability - Asset, Ending balance    12.3   
Environmental liability - Net, Beginning balance   101.8 99.7
Continuing Operation, Net   (3.7) 13.0
Discontinued operations, Net   (2.9) 0.5
Accruals added during the period for new matters, Net        
Net cash activity, Net   (11.5) (11.4)
Foreign currency, Net   0.1  
Environmental liability - Net, Ending balance $ 101.8 $ 83.8 $ 101.8