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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2013
Accounts Receivable  
Summary of trade accounts receivable

The following is a summary of trade accounts receivable at December 31, (in millions):

 
   2013   2012  

Gross accounts receivable

   $ 315.5   $ 297.2  

Allowance for doubtful accounts

     (7.9 )   (7.9 )
           
​ ​ ​ ​ ​ ​ ​ ​

Accounts receivable, net

   $ 307.6   $ 289.3  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
           
Summary of activity in the allowance for doubtful accounts

The following is a summary of the activity in the Company's allowance for doubtful accounts at December 31, (in millions):

 
   Balance at
Beginning of
Period		   Additions
Charged to
Expense		   Deductions
Amounts
Written Off		   Balance at End
of Period		  

2013

   $ 7.9   $ 1.3   $ (1.3 ) $ 7.9  

2012

     5.6     3.0     (0.7 )   7.9  

2011

     5.1     0.9     (0.4 )   5.6