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Long term incentive partnership units outstanding.

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Long Term Incentive Partnership Units Value Per Unit

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Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests, Shares

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Total Grant Date Fair Value

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- Definition

ShareBasedCompensationArrangementByShareBasedPaymentAward,Estimated Shares Expected to Vest

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- Definition

Share based compensation plan.

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- Definition

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

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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

Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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

Gross number of share options (or share units) granted during the period.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Share-Based Compensation Plan - Narrative (Details) $ / shares in Units, $ in Millions										1 Months Ended						3 Months Ended		9 Months Ended
	Jul. 24, 2020 shares	Feb. 12, 2020 shares	Feb. 13, 2019 shares	Feb. 14, 2018 shares	Feb. 15, 2017 shares	Feb. 10, 2016 shares	Jul. 27, 2015 shares	Feb. 11, 2015 shares	Dec. 13, 2013 USD ($) $ / shares shares	Feb. 29, 2020 shares	Jan. 31, 2020 shares	Jan. 31, 2019 shares	Jan. 31, 2018 shares	Jan. 31, 2017 shares	Jan. 31, 2016 shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) class shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2019 shares
Share-Based Compensation Plan (Textual) [Abstract]
Common shares available for issuance under the Plan (in shares)																895,291		895,291
LTIP units, outstanding (in shares)																127,111		127,111		236,351
Restricted common shares
Share-Based Compensation Plan (Textual) [Abstract]
Accelerated share-based compensation \| $																		$ 5.5
Compensation expense \| $																$ 0.6	$ 0.6	7.4	$ 1.7
Total unrecognized compensation expense \| $																3.6		$ 3.6
Period over which compensation expense is expected to be recognized																		1 year 9 months 18 days
Awards granted (in shares)																		332,920
Awards vested (in shares)																		72,824
Restricted common shares \| Minimum
Share-Based Compensation Plan (Textual) [Abstract]
Award vesting period																		3 years
Restricted common shares \| Maximum
Share-Based Compensation Plan (Textual) [Abstract]
Award vesting period																		5 years
Performance-based shares
Share-Based Compensation Plan (Textual) [Abstract]
Compensation expense \| $																1.0	1.2	$ 3.1	3.5
Total unrecognized compensation expense \| $																5.9		$ 5.9
Period over which compensation expense is expected to be recognized																		1 year 9 months 18 days
Performance-based shares \| December 13, 2013
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)									252,088
Performance-based shares \| December 2013 - Tranche 1
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)															50,418
Estimated shares expected to vest, percent															49.00%
Awards vested (in shares)															25,134
Performance-based shares \| December 2013 - Tranche 2
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)														49,914
Estimated shares expected to vest, percent														25.00%
Awards vested (in shares)														12,285
Performance-based shares \| December 2013 - Tranche 3
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)												49,914	49,914
Estimated shares expected to vest, percent												71.00%	145.00%
Awards vested (in shares)												35,471	72,236
Performance-based shares \| December 2013 - Tranche 4 [Member]
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)										49,914
Estimated shares expected to vest, percent										56.00%
Awards vested (in shares)										27,881
Performance-based shares \| February 11, 2015
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)								44,962
Performance-based shares \| July 27, 2015
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)							771
Performance-based shares \| February 10, 2016
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)						100,919
Performance-based shares \| February 15, 2017
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)					81,939
Performance-based shares \| February 14, 2018
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)				78,918
Performance-based shares \| February 13, 2019
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)			126,891
Performance-based shares \| February 12, 2020
Share-Based Compensation Plan (Textual) [Abstract]
Awards granted (in shares)		161,777
Performance-based shares \| Minimum \| February 14, 2018
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent				0.00%
Performance-based shares \| Minimum \| February 13, 2019
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent			0.00%
Performance-based shares \| Minimum \| February 12, 2020
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent		0.00%
Performance-based shares \| Maximum \| February 14, 2018
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent				200.00%
Performance-based shares \| Maximum \| February 13, 2019
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent			200.00%
Performance-based shares \| Maximum \| February 12, 2020
Share-Based Compensation Plan (Textual) [Abstract]
Estimated shares expected to vest, percent		200.00%
LTIP units
Share-Based Compensation Plan (Textual) [Abstract]
Accelerated share-based compensation \| $																		$ 10.5
Compensation expense \| $																0.0	$ 0.3	10.6	$ 0.8
Total unrecognized compensation expense \| $																$ 0.0		$ 0.0
Awards granted (in shares)		415,818
Classes of LTIP Units \| class																		2
Redemption of non-controlling interest LTIP units (in shares)	109,240
LTIP Class B units
Share-Based Compensation Plan (Textual) [Abstract]
Award vesting period																		5 years
LTIP units granted (shares)									226,882
Value of LTIP grants per unit (in usd per share) \| $ / shares									$ 29.19
Grant date fair value of LTIP unit awards \| $									$ 6.6
Officer \| Performance-based shares \| February 11, 2015
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)													14,089
Employee \| Performance-based shares \| February 11, 2015
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)													2,501
Employee \| Performance-based shares \| July 27, 2015
Share-Based Compensation Plan (Textual) [Abstract]
Awards vested (in shares)													1,079
Common Shares
Share-Based Compensation Plan (Textual) [Abstract]
Shares issued for awards vested (in shares)																0		103,083	275,066
Redemption of non-controlling interest LTIP units (in shares)																109,240		109,240
Common Shares \| Officer \| February 10, 2016
Share-Based Compensation Plan (Textual) [Abstract]
Shares issued for awards vested (in shares)												142,173
Common Shares \| Officer \| February 15, 2017
Share-Based Compensation Plan (Textual) [Abstract]
Shares issued for awards vested (in shares)											1,972
Common Shares \| Employee \| February 10, 2016
Share-Based Compensation Plan (Textual) [Abstract]
Shares issued for awards vested (in shares)												31,146
Common Shares \| Employee \| February 15, 2017
Share-Based Compensation Plan (Textual) [Abstract]
Shares issued for awards vested (in shares)											405