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Derivative Instruments and Risk Management (Tables)
 3 Months Ended
Mar. 31, 2013
Derivative Instruments and Risk Management [Abstract]  
Summary of commodity swaps
                                 
    March 31, 2013     December 31, 2012  

(in millions)

   Carrying
Amount		     Fair
Value		     Carrying
Amount		     Fair
Value		  

Notional quantity—275 tonnes

                   $ 0.1     $ 0.1  

Notional quantity—100 tonnes

   $ 0.0     $ 0.0                  
Summary of foreign currency forward exchange contracts which have not been designated as hedging instruments, and their impact on the income statement
             

(in millions)

  

Location of Gain/(Loss)
Recognized in Income

   Amount of Gain/(Loss)
Recognized in Income		  

Foreign currency forward exchange contracts

   Other income/(expense)   $   2.1