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Employee Benefit Plans (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2020
grant_recipient
$ / shares
shares
Nov. 30, 2019
$ / shares
shares
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Document Period End Date         Mar. 31, 2020  
Share-based Payment Arrangement, Noncash Expense         $ 37.9 $ 35.9
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     $ 2.3   4.5  
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] | November Two Thousand Nineteen Grant [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period   3 years        
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Payment Arrangement, Noncash Expense     20.3 $ 17.2 36.2 $ 34.4
Restricted Stock [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     4.1   4.1  
Retirement Eligible [Member] | Restricted Stock [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