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Goodwill
 12 Months Ended
Dec. 31, 2013
Goodwill.  
Goodwill

Note 5. Goodwill

        The changes in the carrying amount of goodwill are as follows:

 
   (in millions)  

Balance at December 31, 2010

   $ 1,109.6  

Acquisition

     138.5  

Purchase price allocation adjustments

     0.2  

Effect of foreign currency translation

     (4.0 )
       
​ ​ ​ ​ ​

Balance at December 31, 2011

     1,244.3  

Acquisitions

     68.0  

Effect of foreign currency translation

     2.3  
       
​ ​ ​ ​ ​

Balance at December 31, 2012

     1,314.6  

Acquisitions

     382.4  

Effect of foreign currency translation

     (5.4 )
       
​ ​ ​ ​ ​

Balance at December 31, 2013

   $ 1,691.6  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​
       

        We had no accumulated impairment losses related to goodwill at December 31, 2013.