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Analysis of Restructuring Reserves Included in Other Accrued Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]      
Balance as of December 31, 2009 $ 0.1    
Charges and adjustments to selling, general and administrative expenses (1.4)   (4.4)
Balance as of December 31, 2010 1.0    
2012 Plan
      
Restructuring Cost and Reserve [Line Items]      
Charges and adjustments to selling, general and administrative expenses 1.5    
Cash payments (0.5)    
Balance as of December 31, 2010 1.0    
2012 Plan | Employee Severance
      
Restructuring Cost and Reserve [Line Items]      
Charges and adjustments to selling, general and administrative expenses 1.5    
Cash payments (0.5)    
Balance as of December 31, 2010 1.0    
2010 Plan
      
Restructuring Cost and Reserve [Line Items]      
Balance as of December 31, 2009 0.1 2.3  
Charges and adjustments to selling, general and administrative expenses (0.1)   4.0
Cash payments   (2.2) (1.7)
Balance as of December 31, 2010   0.1 2.3
2010 Plan | Employee Severance
      
Restructuring Cost and Reserve [Line Items]      
Balance as of December 31, 2009   1.9  
Charges and adjustments to selling, general and administrative expenses   0.1 3.5
Cash payments   (2.0) (1.6)
Balance as of December 31, 2010     1.9
2010 Plan | Other Restructuring
      
Restructuring Cost and Reserve [Line Items]      
Balance as of December 31, 2009 0.1 0.4  
Charges and adjustments to selling, general and administrative expenses (0.1) (0.1) 0.5
Cash payments   (0.2) (0.1)
Balance as of December 31, 2010   $ 0.1 $ 0.4