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Postretirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
U.S. Benefit Plan [Member]
        
Net periodic pension expense for defined benefit pension plans        
Service Cost            
Interest cost 2.2 1.9 4.0 3.7
Expected return on plan assets (2.4) (1.8) (4.4) (3.6)
Amortization of actuarial loss 1.5 1.1 2.8 2.2
Net periodic pension expense 1.3 1.2 2.4 2.3
Non-U.S. Benefit Plan [Member]
        
Net periodic pension expense for defined benefit pension plans        
Service Cost 0.1    0.1 0.1
Interest cost 0.6 0.7 1.3 1.4
Expected return on plan assets (0.7) (0.8) (1.3) (1.6)
Amortization of actuarial loss 0.2 0.2 0.4 0.4
Net periodic pension expense $ 0.2 $ 0.1 $ 0.5 $ 0.3