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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Pension settlement charge $ 51.9 $ 0.0 $ 51.9 $ 0.0  
Discount rate 5.90%       5.85%
Increase in net pension expense $ 0.5        
Pension expense recognized in pension earnings, interest and deferrals 0.2        
Defined benefit plan, benefit obligation, actuarial gain (loss) 17.4        
Pension Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Pension settlement charge 51.9 0.0 51.9 0.0  
Increase in net pension expense 58.5 5.2 71.4 15.5  
Contributions     4.9 0.0  
Expected contributions for next fiscal year 6.4   6.4    
Other Postretirement Plans          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Pension settlement charge 0.0 0.0 0.0 0.0  
Increase in net pension expense $ (0.5) $ (0.2) $ (1.6) $ (0.6)