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Other Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2013
Goodwill/Other Intangible Assets [Abstract]  
Summary of Other Intangible Assets
                 
    Three Months Ended
March 31
 

(in millions)

      2013             2012      

Gross cost at January 1

  $ 106.2     $ 51.2  

Capitalization of internally developed software and other costs

    2.1       2.5  

Exchange effect

    0.0       0.0  
   

 

 

   

 

 

 

Gross cost at March 31

    108.3       53.7  
   

 

 

   

 

 

 

Accumulated amortization at January 1

    (37.6     (33.5

Amortization expense

    (2.1     (1.0

Exchange effect

    (0.1     0.0  
   

 

 

   

 

 

 

Accumulated amortization at March 31

    (39.8     (34.5
   

 

 

   

 

 

 

Net book amount at March 31

  $ 68.5     $ 19.2