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Summary of Pension Assets in Three-Tier Fair Value Hierarchy for Benefit Plan (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
U.S. Benefit Plans
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value $ 112.2 $ 97.0 $ 104.8
U.S. Benefit Plans | Cash and Cash Equivalents
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 3.7 3.9  
U.S. Benefit Plans | US Large Cap Equity Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 32.7 27.7  
U.S. Benefit Plans | US Small / Mid Cap Equity Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 11.9 9.9  
U.S. Benefit Plans | Developed International
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 6.6 3.7  
U.S. Benefit Plans | Equity Securities Emerging Markets
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 4.5 3.3  
U.S. Benefit Plans | US Government Debt Securities | Fixed Income Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 5.7 4.5  
U.S. Benefit Plans | Asset-backed Securities | Fixed Income Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 5.9 6.7  
U.S. Benefit Plans | Common Stock
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 7.1 3.9  
U.S. Benefit Plans | Collective/Common Trust and Other Mutual Funds
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 34.1 33.4  
U.S. Benefit Plans | Level 1
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 106.3 86.3  
U.S. Benefit Plans | Level 1 | Cash and Cash Equivalents
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 3.7    
U.S. Benefit Plans | Level 1 | US Large Cap Equity Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 32.7 27.7  
U.S. Benefit Plans | Level 1 | US Small / Mid Cap Equity Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 11.9 9.9  
U.S. Benefit Plans | Level 1 | Developed International
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 6.6 3.7  
U.S. Benefit Plans | Level 1 | Equity Securities Emerging Markets
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 4.5 3.3  
U.S. Benefit Plans | Level 1 | US Government Debt Securities | Fixed Income Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 5.7 4.5  
U.S. Benefit Plans | Level 1 | Common Stock
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 7.1 3.9  
U.S. Benefit Plans | Level 1 | Collective/Common Trust and Other Mutual Funds
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 34.1 33.3  
U.S. Benefit Plans | Level 2
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 5.9 10.7  
U.S. Benefit Plans | Level 2 | Cash and Cash Equivalents
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value   3.9  
U.S. Benefit Plans | Level 2 | Asset-backed Securities | Fixed Income Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 5.9 6.7  
U.S. Benefit Plans | Level 2 | Collective/Common Trust and Other Mutual Funds
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value   0.1  
Non-U.S. Benefit Plan
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 54.8 47.9 50.6
Non-U.S. Benefit Plan | Cash and Cash Equivalents
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 10.6 8.6  
Non-U.S. Benefit Plan | Equity Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 34.5 29.1  
Non-U.S. Benefit Plan | US Treasury and Government
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 4.1 4.9  
Non-U.S. Benefit Plan | Corporate Debt Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 5.6 5.3  
Non-U.S. Benefit Plan | Level 1
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 25.1 22.8  
Non-U.S. Benefit Plan | Level 1 | Cash and Cash Equivalents
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 10.6 8.6  
Non-U.S. Benefit Plan | Level 1 | Equity Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 4.8 4.0  
Non-U.S. Benefit Plan | Level 1 | US Treasury and Government
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 4.1 4.9  
Non-U.S. Benefit Plan | Level 1 | Corporate Debt Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 5.6 5.3  
Non-U.S. Benefit Plan | Level 2
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value 29.7 25.1  
Non-U.S. Benefit Plan | Level 2 | Equity Securities
      
Fair Value Hierarchy Of Plan Assets By Category [Line Items]      
Total assets at fair value $ 29.7 $ 25.1