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v3.20.1

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 |  |  |

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