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Business Combinations (Narrative) (Details)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2013
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2012
USD ($)
Jul. 31, 2012
Indura [Member]
USD ($)
Jul. 31, 2012
Indura [Member]
CLP
Jun. 30, 2013
Indura [Member]
USD ($)
Jun. 30, 2013
Indura [Member]
CLP
Jul. 03, 2012
Indura [Member]
USD ($)
Jun. 30, 2012
DANanoMaterials [Member]
USD ($)
Apr. 02, 2012
DANanoMaterials [Member]
USD ($)
Jun. 30, 2012
DANanoMaterials [Member]
USD ($)
Business Acquisition [Line Items]                        
Percentage of shares purchased         64.80% 64.80%         50.00%  
Percentage of results consolidated         100.00% 100.00%            
Cash consideration         $ 690 345,500            
Acquired debt         227 113,800            
Agreement to purchase additional equity interest under put option         30.50% 30.50%            
Put option exercise period start date         1 July 2015 1 July 2015            
Put option exercise period beginning 1 July 2015                 2 years      
Percentage ownership to be purchased         2.00% 2.00%            
Payment for additional shares             11 5,500        
Intangible assets                 382.1      
Plant and equipment                 397.2      
Goodwill 67.0   67.0           626.2      
Deferred tax liabilities                 131.3      
Purchase price of acquired entity 134   134               158  
Cash acquired from acquisition                     11  
Acquisitions, less cash acquired     125.6 173.8             147.0  
Previous percent ownership                     50.00%  
Gain on previously held equity interest 0 85.9 0 85.9           85.9   85.9
Gain on previously held equity interest, after tax                   $ 54.6   $ 54.6
Gain on previously held equity interest, per share                   $ 0.25   $ 0.25