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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Reduction Of Grants In Period

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- Definition

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Reduction Of Grants In Period, Fair Value

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- Definition

Share-Based Payment Arrangement By Share-Based Payment Award, Retirement Age

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Percentage Of Award Face Amount

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Look-Back Period

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Threshold Service Years For Retirement Eligibility

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- Definition

Share-based Payment Arrangement by Share-based Payment Award, Equity Other than Options, Vesting Threshold, Age of Grantee

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No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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No definition available.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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No definition available.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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	9 Months Ended
	Aug. 31, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares	May 31, 2020 USD ($) vesting_installment shares	Mar. 31, 2020 USD ($) vesting_installment shares	Mar. 31, 2019 USD ($) vesting_installment shares	Sep. 30, 2020 USD ($) shares	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019 USD ($)	Oct. 31, 2019 USD ($) vesting_installment shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	May 16, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement age							65 years	60 years
Expected volatility rate look-back period (in years)											6 years
Weighted-average per unit or share fair value (in USD per share) \| $ / shares											$ 5.43
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 \| $						$ 0.4			$ 0.3		$ 2.3	$ 1.8
Unrecognized compensation expense \| $						1.7					$ 1.7
Unrecognized compensation expense, period for recognition											2 years 3 months 18 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 \| $						5.1			$ 3.4		$ 17.9	$ 13.6
Unrecognized compensation expense \| $						$ 31.4					$ 31.4
Unrecognized compensation expense, period for recognition											2 years 3 months 18 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 \| $											$ 28.1
Weighted-average per unit or share fair value (in USD per share) \| $ / shares											$ 5.43
Dividend rate (as a percent)											3.70%
Risk free interest rate, minimum (as a percent)											0.16%
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)			63,229	113,971
Fair value of share-based awards granted in period \| $			$ 0.4	$ 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	3 years
Number of vesting installments \| vesting_installment			2	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)			82,199	745,155
Fair value of share-based awards granted in period \| $			$ 0.5	$ 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)			116,927	3,358,767
Fair value of share-based awards granted in period \| $			$ 0.5	$ 14.0
Reduction of grants (in shares)		666,933
Fair value of reduction of share-based awards granted in period \| $		$ 2.8
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)	25,242		171,153							76,718
Fair value of share-based awards granted in period \| $	$ 0.2		$ 1.1							$ 1.1
Award vesting period	3 years									3 years
Number of vesting installments \| vesting_installment										2
Certain Other Employees \| Market Based Long-Term Incentive Plan Unit \| 2019 Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reduction of grants (in shares)		99,630
Fair value of reduction of share-based awards granted in period \| $		$ 0.5
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)						8,500,000					8,500,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Age of grantee at which LTIP unit and restricted stock awards immediately vest											60 years
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
Minimum \| Time Based Long-Tern Incentive Plan Unit \| 2019 Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Number of vesting installments \| vesting_installment			2
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Age of grantee at which LTIP unit and restricted stock awards immediately vest											65 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 6 months
Maximum \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period											4 years
Maximum \| Time Based Long-Tern Incentive Plan Unit \| 2019 Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
Number of vesting installments \| vesting_installment			3