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Company's Liability for Environmental Obligations (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Environmental Exit Cost [Line Items]    
Total Environmental Obligations Balance at Beginning of Period $ 14.7 $ 14.6
Changes in Estimates 0.1 0.1
Liabilities Assumed      
Less: Payments / Reductions      
Total Environmental Obligations at End of Period 14.8 14.7
Less: Current Portion 1.0 [1] 0.2 [1]
Environmental Obligations-noncurrent-Balance at End of Period $ 13.8 $ 14.5
[1] Reflects amounts included in Other Current Liabilities on the Company's Consolidated Balance Sheets.