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Business Separation Costs (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]          
Business separation costs $ 0.0 $ 9.5 $ 30.2 $ 28.9  
Materials Technologies [Member]          
Restructuring Cost and Reserve [Line Items]          
Business separation costs 0.0 9.5 30.2 28.9  
Tax benefit related to changes in tax positions on business separation activities $ 8.2   $ 8.2    
Electronic Materials Division [Member]          
Restructuring Cost and Reserve [Line Items]          
Tax expense related to repatriation of foreign earnings   $ 45.7   $ 45.7  
Foreign earnings repatriated         $ 443.8