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Contingencies - Additional Information (Detail)
$ in Millions
 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended 18 Months Ended
Jun. 30, 2015
USD ($)
LegalMatter
Jun. 30, 2014
USD ($)
Jan. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
LegalMatter
Vendor
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
LegalMatter
Jun. 30, 2015
USD ($)
LegalMatter
Dec. 31, 2013
USD ($)
LegalMatter
Loss Contingencies [Line Items]                
Number of lawsuits | LegalMatter 2,047     2,047   2,326 2,047 2,840
Loss contingency, years of activity       5 years        
Number of insurance carriers | Vendor       20        
Increase in insurance settlements receivable             $ 94.2  
Insurance receivables $ 219.0     $ 219.0   $ 220.5 219.0 $ 124.8
Insurance receivables, current 2.0     2.0   2.0 2.0  
Insurance receivables, noncurrent 217.0     217.0   218.5 217.0  
Single Incident                
Loss Contingencies [Line Items]                
Reserves for product liability claims 3.4     3.4   3.5 3.4  
Product liability expense       0.7 $ 0.6      
Cumulative Trauma                
Loss Contingencies [Line Items]                
Product liability expense           169.6    
Litigation settlement amount     $ 71.8          
Loss contingency accrual, product liability, net 72.3     $ 72.3   74.9 $ 72.3  
Uninsured Cumulative Trauma                
Loss Contingencies [Line Items]                
Product liability expense $ 0.3 $ 2.2            
Other Noncurrent Liabilities | Cumulative Trauma                
Loss Contingencies [Line Items]                
Loss contingency accrual, product liability, net           $ 35.1