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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2016
Sep. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Aug. 31, 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     $ 72.6 $ 0.0    
Discount rate     3.92% 3.92%    
Special termination benefits     $ 0.6 $ 9.4    
Employer contributions     103.4 3.2    
Pension Benefits | Qualified Plan            
Defined Benefit Plan Disclosure [Line Items]            
Discretionary contribution $ 100.0          
Special termination benefits       9.4    
Expected contributions for next fiscal year     6.7      
Pension Benefits | Qualified Plan | United States            
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions     100.0 0.0 $ 7.2  
Pension Benefits | Nonqualified Plan            
Defined Benefit Plan Disclosure [Line Items]            
Employer contributions     3.5 3.2 3.3  
Other Benefits            
Defined Benefit Plan Disclosure [Line Items]            
Curtailment charge     $ 0.0 $ 0.0    
Discount rate     3.89% 3.86%    
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     3.3      
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     2.9      
Employer contributions     $ 3.2 13.0    
Other Benefits | Equity securities            
Defined Benefit Plan Disclosure [Line Items]            
Plan's current allocation policy     75.00%      
Other Benefits | Fixed income securities            
Defined Benefit Plan Disclosure [Line Items]            
Plan's current allocation policy     25.00%      
Defined Contribution Retirement and Savings Plans | United States            
Defined Benefit Plan Disclosure [Line Items]            
Contributions to defined contribution retirement and savings plans     $ 16.7 $ 11.8 $ 12.0