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Composition of Foreign Pension Plan Assets (Detail) (Pension Benefits, Foreign, USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 33.5 $ 30.2 $ 29.3
Equity Securities And Funds
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.9 5.1  
Fixed Income Securities And Funds
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10.4 8.9  
Cash And Other
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.2 16.2  
Level 1
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17.3 14.9  
Level 1 | Equity Securities And Funds
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 5.9 5.1  
Level 1 | Fixed Income Securities And Funds
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 10.4 8.9  
Level 1 | Cash And Other
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.0 0.9  
Level 3
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 16.2 15.3 15.3
Level 3 | Cash And Other
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 16.2 $ 15.3