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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]        
Curtailment charge     $ 0.5  
Discount rate 3.57%      
Reduction in long-term pension liabilities $ (18.7)      
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%    
Return Seeking Asset        
Defined Benefit Plan Disclosure [Line Items]        
Plan's current allocation policy   60.00%    
Liability Matching Assets        
Defined Benefit Plan Disclosure [Line Items]        
Plan's current allocation policy   40.00%    
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Curtailment charge   $ 0.0 $ 72.6  
Discount rate   4.32% 3.92%  
Special termination benefits   $ 0.2 $ 0.6  
Employer contributions   10.0 103.4  
Pension Benefits | Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Discretionary contribution   6.7 100.0  
Special termination benefits       $ 9.4
Expected contributions for next fiscal year   5.5    
Pension Benefits | Qualified Plan | United States        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   6.7 100.0 0.0
Pension Benefits | Nonqualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions   3.3 3.5 3.2
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Curtailment charge   $ 0.0 $ 0.0  
Discount rate   4.32% 3.89%  
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   0.1    
Effect of one percentage point increase in the assumed health care cost trend rate on postretirement benefit obligation   2.6    
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   2.3    
Employer contributions   $ 3.3 3.2  
Other Benefits | Equity securities        
Defined Benefit Plan Disclosure [Line Items]        
Plan's current allocation policy   87.00%    
Other Benefits | Fixed income securities        
Defined Benefit Plan Disclosure [Line Items]        
Plan's current allocation policy   13.00%    
Defined Contribution Retirement and Savings Plans | United States        
Defined Benefit Plan Disclosure [Line Items]        
Contributions to defined contribution retirement and savings plans   $ 22.6 $ 16.7 $ 11.8