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Dissolution of Strategic Partnership (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2012
Mar. 31, 2013
Mar. 31, 2013
Carpenter Powder Products AB
Nov. 30, 2012
Sandvik Powdermet AB
Nov. 30, 2012
Sandvik
Carpenter Powder Products AB
Nov. 30, 2012
Sandvik
Carpenter Products AB
Dissolution of strategic partnership            
Ownership interest (as a percent)       40.00%    
Noncontrolling interest (as a percent)         40.00%  
Proceeds from the sale of investment   $ 7.9   $ 7.9    
Payment to repurchase the shares   8.4       8.4
Gain related to the sale of the investment 1.9          
Gain (loss) recognized related to repurchase of minority interest     $ 0