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Employee Benefit Plans (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
$ / shares
Nov. 30, 2019
$ / shares
shares
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
grant_recipient
shares
Jun. 30, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Document Period End Date         Jun. 30, 2020  
Share-based Payment Arrangement, Noncash Expense         $ 59.2 $ 53.9
Performance Shares [Member] | November Two Thousand Nineteen 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   $ 52.54        
Share-based Payment Arrangement, Noncash Expense     $ 2.5   $ 7.0  
Performance Shares [Member] | November Two Thousand Nineteen 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 Nineteen 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 Units (RSUs) [Member] | March Two Thousand Twenty Grant [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSUs granted in the period | shares         1,700,000  
Fair value of equity awards on the date of grant (in US$ per unit) | $ / shares $ 35.98          
RSU Grant Recipients | grant_recipient         960  
Share-based Payment Arrangement, Noncash Expense     3.4   $ 7.5  
Restricted Stock Units (RSUs) [Member] | March Two Thousand Twenty Grant [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period         3 years  
Restricted Stock Units (RSUs) [Member] | March Two Thousand Twenty Grant [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period         5 years  
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Payment Arrangement, Noncash Expense     20.4 $ 16.8 $ 56.6 $ 51.1
Retirement Eligible [Member] | Restricted Stock Units (RSUs) [Member] | March Two Thousand Twenty Grant [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Payment Arrangement, Noncash Expense     $ 3.5   $ 3.5