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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2013
Stockholders' Equity  
Summary of share repurchases
   
  Amount
Authorized
by Board
(Shares in
millions)
   
  Shares
Remaining
Under Board
Authorization
(millions)
  Shares Repurchased
Under Board
Authorization
 
 
   
  Total
Shares
Purchased
(millions)
 
 
  Expiration
Date
 
Repurchase Program Authorization Date
  2013   2012   2011  

July 2010

  none     4.0     4.0                 2.9  

October 2011

  none     4.0     4.0         1.5     2.5     0.1  

May 2013

  none     4.0     0.5     3.5     0.5          
                                     

Total shares repurchased under authorization

                          2.0     2.5     3.0  
                                     
                                     

Cost (millions)

                        $ 28.2   $ 23.5   $ 38.9  
                                     

Average share price

                        $ 14.05   $ 9.50   $ 13.09