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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended
Jun. 30, 2012
sites
Jun. 30, 2012
Centredale Site
Jun. 30, 2012
Centredale Site
Minimum
Jun. 30, 2012
Centredale Site
Maximum
Jun. 30, 2012
Property, Plant and Equipment, Other Types
Dec. 31, 2011
Property, Plant and Equipment, Other Types
Jun. 30, 2012
Property, Plant and Equipment, Other Types
Minimum
Jun. 30, 2012
Property, Plant and Equipment, Other Types
Maximum
Loss Contingencies [Line Items]                
Environmental remediation costs deemed probable and reasonably estimable     $ 68.1 $ 139.7     $ 140.7 $ 281.0
Environmental remediation costs, reserve   68.1     162.5 164.8    
Superfund Sites 30              
Reserve for environmental remediation costs, current         10.2      
Reserve for environmental remediation costs, noncurrent         $ 152.3