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Pensions (Detail) (Pension Plans, Defined Benefit, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
U.S. Benefit Plans
    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 1.8 $ 1.8
Amortization of actuarial loss 1.8 1.3
Expected return on plan assets (2.2) (2.0)
Net postretirement pension expense 1.4 1.1
Non-U.S. Benefit Plan
    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 0.6 0.7
Amortization of actuarial loss 0.2 0.2
Expected return on plan assets (0.6) (0.6)
Net postretirement pension expense $ 0.2 $ 0.3