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Pensions and Other Postretirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pension Plans, Defined Benefit [Member]
        
Components of net annual benefit cost (income):        
Service cost $ 5.1 $ 4.6 $ 15.2 $ 14.4
Interest cost 15.6 15.3 46.1 46.1
Expected return on plan assets (19.0) (20.6) (57.4) (61.8)
Amortization of prior service cost (gain) 0.4 0.5 1.5 1.5
Recognized net actuarial and other (gain) loss 11.9 8.9 38.4 27.3
Net periodic benefit cost from continuing operations 14.0 8.7 43.8 27.5
U.S. Defined Benefit Pension Plan [Member]
        
Pension and Other Postretirement Benefit Contributions [Abstract]        
Voluntary cash contributions made to U.S. defined benefit pension plan     65.0  
Other Postretirement Benefit Plans, Defined Benefit [Member]
        
Components of net annual benefit cost (income):        
Service cost 0 0 0.1 0.2
Interest cost 0.4 0.3 1.0 1.5
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (gain) 0 (0.4) (0.1) (0.6)
Recognized net actuarial and other (gain) loss (0.8) (0.5) (1.8) (0.7)
Net periodic benefit cost from continuing operations $ (0.4) $ (0.6) $ (0.8) $ 0.4