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Summary of Significant Accounting Policies (Details)
$ in Millions
12 Months Ended
Jun. 30, 2016
USD ($)
customer
facility
Jun. 30, 2015
USD ($)
customer
Jun. 30, 2014
USD ($)
customer
Summary of significant accounting policies      
Proceeds received from sale of equity method investment $ 6.3 $ 0.0 $ 0.0
Note receivables recorded from sale of equity method investment 12.6    
Discounts, rebates, returns and allowances 29.8 27.4 28.3
Research and development expenditures 16.3 18.7 18.5
Inventory accounted under method other than LIFO 118.4 154.9  
Capitalized software amortization expense 5.5 6.1 $ 6.4
Carrying value of computer software $ 49.3 $ 37.4  
Number of former operating facility site that the liability for future costs is discounted to present value | facility 1    
Liability for future costs discount amortization period (in years) 20 years    
Environmental expenditures, discount rate 3.00% 4.00%  
Environmental expenditures, liability $ 10.9 $ 10.8  
Customer | Sales Revenue      
Summary of significant accounting policies      
Concentration risk, number of customers | customer   0 0
Customer | Sales Revenue | Alcoa      
Summary of significant accounting policies      
Concentration risk, number of customers | customer 1   0
Concentration risk 13.00%    
Customer | Accounts receivable      
Summary of significant accounting policies      
Concentration risk, number of customers | customer     0
Concentration risk 22.00%    
Customer | Accounts receivable | Alcoa      
Summary of significant accounting policies      
Concentration risk, number of customers | customer   1  
Concentration risk   17.00%  
Customer | Accounts receivable | Alcoa, Inc. and Precision Castparts Corporation      
Summary of significant accounting policies      
Concentration risk, number of customers | customer 2    
Concentration risk 22.00%    
Minimum      
Summary of significant accounting policies      
Ownership interest 20.00%    
Minimum | Computer software      
Summary of significant accounting policies      
Estimated useful life (in years) 3 years    
Minimum | Intangible Assets      
Summary of significant accounting policies      
Estimated useful life (in years) 2 years 6 months    
Maximum      
Summary of significant accounting policies      
Ownership interest 50.00%    
Maximum | Computer software      
Summary of significant accounting policies      
Estimated useful life (in years) 7 years    
Maximum | Intangible Assets      
Summary of significant accounting policies      
Estimated useful life (in years) 30 years