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Environmental, Contingencies and Commitments (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
site
Dec. 31, 2011
Dec. 31, 2012
Other Contingencies [Member]
Dec. 31, 2011
Other Contingencies [Member]
Dec. 31, 2012
Other Contingencies [Member]
Asbestos Issue [Member]
Dec. 31, 2011
Other Contingencies [Member]
Asbestos Issue [Member]
Dec. 31, 2012
Other Commitments [Member]
Dec. 31, 2011
Other Commitments [Member]
Dec. 31, 2010
Other Commitments [Member]
Feb. 28, 2013
Subsequent Event [Member]
Dec. 31, 2012
Accrued Liabilities [Member]
Dec. 31, 2011
Accrued Liabilities [Member]
Dec. 31, 2012
Noncurrent Liabilities [Member]
Dec. 31, 2011
Noncurrent Liabilities [Member]
Dec. 31, 2012
Environmental Matters [Member]
Dec. 31, 2011
Environmental Matters [Member]
Dec. 31, 2010
Environmental Matters [Member]
Environment Matters And Other Contingencies [Line Items]                                  
Environmental damages                   $ 200.0              
Aggregate environmental related accruals                             68.1 69.4  
Aggregate environmental related accruals, current 9.7 6.9                 9.7 6.9          
Aggregate environmental related accruals, non current                         58.4 62.5      
Environmental remediation spending                             3.9 3.9 4.6
Increase in environmental related accruals                             1.6    
Asset retirement obligations, number of sites 19                                
Asbestos related portion of self-insured and insured contingent liability     49.8 53.0 39.3 42.4                      
Asbestos related portion of insurance recovery receivable     20.7 22.1 20.4 21.8                      
Decrease of self-insured and insured contingent liabilities         2.1                        
Decrease of receivables for probable insurance recoveries for pending and future claims         1.0                        
Recovery of future asbestos indemnity costs         48.00%                        
Percent of defense costs to be paid by insurers (50.00%)                                
Rental expense under property and equipment leases             10.9 7.4 7.0                
Capital lease asset and obligation 7.6                                
Obligations under long-term agreements             46.5                    
Obligations under long-term agreements expected to be paid in 2013             42.0                    
Outstanding letters of credit             $ 35.9