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Capital - Incentive and Share-based Compensation (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
vesting_installment
shares
Mar. 31, 2019
USD ($)
vesting_installment
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Oct. 31, 2019
USD ($)
vesting_installment
shares
May 16, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected volatility rate look-back period (in years)     6 years      
Weighted-average per unit or share fair value (in USD per share) | $ / shares     $ 5.23      
Age of grantee at which LTIP unit and restricted stock awards immediately vest     60 years      
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest (in years)     10 years      
Awards that meet age and service requirements for vesting            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Noncash share-based compensation expense recognized | $     $ 1.6 $ 1.3    
Unrecognized compensation expense | $ $ 2.3   $ 2.3      
Unrecognized compensation expense, period for recognition     2 years 8 months 12 days      
Awards that do not meet age and service requirements for vesting            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Noncash share-based compensation expense recognized | $     $ 4.3 $ 4.1    
Unrecognized compensation expense | $ $ 50.3   $ 50.3      
Unrecognized compensation expense, period for recognition     2 years 7 months 6 days      
Long-Term Incentive Plan Units and Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Fair value of share-based awards granted in period | $     $ 28.8      
Weighted-average per unit or share fair value (in USD per share) | $ / shares     $ 5.23      
Dividend rate (as a percent)     3.70%      
Risk free interest rate, minimum (as a percent)     0.37%      
Risk free interest rate, maximum (as a percent)     0.50%      
Expected price volatility, minimum (as a percent)     19.00%      
Expected price volatility, maximum (as a percent)     26.00%      
Time Based Long-Tern Incentive Plan Unit            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Threshold of continuous service for retirement eligibility (in years)     10 years      
Time Based Long-Tern Incentive Plan Unit | 2019 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 113,971          
Fair value of share-based awards granted in period | $ $ 2.3          
Award vesting period 4 years          
Number of vesting installments | vesting_installment 3          
Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)   61,432        
Fair value of share-based awards granted in period | $   $ 2.0        
Award vesting period   4 years        
Number of vesting installments | vesting_installment   3        
Market Based Long-Term Incentive Plan Unit | 2019 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 502,475          
Fair value of share-based awards granted in period | $ $ 2.3          
Award vesting period 3 years          
Number of vesting installments | vesting_installment 2          
Market Based Long-Term Incentive Plan Unit | 2013 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)   113,383        
Fair value of share-based awards granted in period | $   $ 0.9        
Award vesting period   3 years        
Number of vesting installments | vesting_installment   2        
Time Restricted Shares | 2019 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 158,806          
Time Restricted Shares | 2013 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)   69,358        
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2019 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 745,155          
Fair value of share-based awards granted in period | $ $ 5.6          
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2019 Plan Units, Connected With Bonus Program            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 624,380          
Fair value of share-based awards granted in period | $ $ 4.4          
Award vesting period     3 years      
Vesting percentage of award face amount 125.00%   125.00%      
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)   461,693        
Fair value of share-based awards granted in period | $   $ 6.4        
Executive Officer | Time Based Long-Tern Incentive Plan Unit | 2013 Plan Units, connected with bonus program            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)   334,952        
Fair value of share-based awards granted in period | $   $ 4.6        
Award vesting period     3 years      
Vesting percentage of award face amount 125.00%   125.00%      
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vesting immediately            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 23,049 26,056        
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vest ratably over three years            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 601,331 308,896        
Award vesting period 3 years 3 years        
Executive Officer | Time Based Long-Tern Incentive Plan Unit | Vest in two equal annual installments            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of vesting installments | vesting_installment 2 2        
Executive Officer | Market Based Long-Term Incentive Plan Unit | 2019 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares) 3,358,767          
Fair value of share-based awards granted in period | $ $ 14.0          
Executive Officer | Market Based Long-Term Incentive Plan Unit | 2013 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)   1,806,520        
Fair value of share-based awards granted in period | $   $ 12.8        
Director | Time Based Long-Tern Incentive Plan Unit | 2019 Plan Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares granted (in shares)         76,718  
Fair value of share-based awards granted in period | $         $ 1.1  
Award vesting period         3 years  
Number of vesting installments | vesting_installment         2  
2019 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized under the plan (in shares) 11,000,000.0   11,000,000.0     11,000,000.0
Number of shares that remain available for future issuance (in shares) 6,900,000   6,900,000      
Minimum | Long-Term Incentive Plan Units and Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected term     2 years      
Minimum | Time Based Long-Tern Incentive Plan Unit            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     3 years      
Maximum | Long-Term Incentive Plan Units and Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected term     5 years 3 months 18 days      
Maximum | Time Based Long-Tern Incentive Plan Unit            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     4 years