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Employee Benefit Plans (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2020
$ / shares
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
grant_recipient
$ / shares
shares
Jun. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Payment Arrangement, Noncash Expense       $ 69.7 $ 59.2
Performance Shares [Member] | November Two Thousand Twenty Grant [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSUs granted in the period | shares 360,000        
Award vesting period 3 years        
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares $ 70.60        
Share-based Payment Arrangement, Noncash Expense   $ 3.1   9.4  
Performance Shares [Member] | November Two Thousand Twenty Grant [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of total units granted that vest in the period 0.00%        
Performance Shares [Member] | November Two Thousand Twenty Grant [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of total units granted that vest in the period 200.00%        
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Payment Arrangement, Noncash Expense   21.4 $ 20.4 $ 66.6 $ 56.6
Restricted Stock [Member] | March Two Thousand Twenty One Grant          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
RSUs granted in the period | shares       860,000  
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares       $ 83.13  
Share-based Payment Arrangement, Noncash Expense   $ 4.0   $ 9.5  
RSU Grant Recipients | grant_recipient       1,030  
Restricted Stock [Member] | March Two Thousand Twenty One Grant | Retirement Eligible [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Payment Arrangement, Noncash Expense       $ 4.8