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Pension and Other Postretirement Benefits - Narrative (Details)
$ in Millions
12 Months Ended
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
employment_position
Jun. 30, 2014
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of salaried positions | employment_position   200  
Percentage increase in funding level to shift assets from return seeking to liability hedging 5.00%    
Percentage change in assets allocation from assets seeking to liability hedging due to increase in funding level 4.00%    
Pension contributions $ 0.0 $ 7.2 $ 6.3
Other Postretirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Special termination benefits 0.0 0.0  
Effect of one percentage point increase in the assumed health care cost trend rate on service and interest cost components 0.2    
Effect of one percentage point increase in the assumed health care cost trend rate on postretirement benefit obligation 3.7    
Effect of one percentage point decrease in the assumed health care cost trend rate on service and interest cost components 0.1    
Effect of one percentage point decrease in the assumed health care cost trend rate on postretirement benefit obligation 2.7    
Net periodic benefit cost 2.9 10.0 11.1
U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Pension contributions 0.0 7.2 6.3
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Special termination benefits 9.4 8.3  
Net periodic benefit cost 50.9 34.5 49.0
Expected contributions for next fiscal year 0.7    
Other non-qualified pension plans      
Defined Benefit Plan Disclosure [Line Items]      
Pension contributions $ 3.2 3.3 3.2
Return Seeking Asset | U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Plan's current allocation policy 60.00%    
Liability Hedging Assets | U.S. Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Plan's current allocation policy 40.00%    
Equity securities | Other Postretirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Plan's current allocation policy 67.00%    
Fixed income securities | Other Postretirement Plans      
Defined Benefit Plan Disclosure [Line Items]      
Plan's current allocation policy 33.00%    
Defined contribution retirement and savings plans      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to defined contribution retirement and savings plans $ 11.8 12.0 $ 10.6
Employee Severance      
Defined Benefit Plan Disclosure [Line Items]      
Restructuring reserve related to pension plans   $ 8.3