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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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- Definition

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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- 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

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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

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

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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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-Topic 718
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-Section 50
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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	5 Months Ended	6 Months Ended		12 Months Ended
	Jul. 13, 2020	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	Mar. 31, 2020	Dec. 31, 2020 USD ($) shares	Jul. 12, 2020	Oct. 31, 2019 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	May 16, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement age (in years)	65 years					60 years		60 years
Expected volatility rate look-back period (in years)										6 years
Weighted-average per unit or share fair value (in dollars per share) \| $ / shares										$ 5.44
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 \| $										$ 2.6	$ 2.0	$ 1.8
Unrecognized compensation expense \| $							$ 1.4			$ 1.4
Unrecognized compensation expense, period for recognition (in years)										2 years 1 month 6 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 \| $										$ 22.9	18.8	17.0
Unrecognized compensation expense \| $							$ 26.5			$ 26.5
Unrecognized compensation expense, period for recognition (in years)										2 years 2 months 12 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 \| $										$ 28.3	$ 27.9	$ 23.6
Weighted-average per unit or share fair value (in dollars per share) \| $ / shares										$ 5.44	$ 9.56	$ 8.54
Expected term (in terms)												2 years 9 months 18 days
Dividend rate (as a percent)										3.70%	2.40%	2.30%
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%
Risk free interest rate (as a percent)												2.50%
Expected volatility rate (as a percent)												20.00%
Fair value vested in period \| $										$ 15.6	$ 10.1	$ 7.7
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]
Number of shares granted (in shares) \| shares			63,229	113,971
Fair value of share-based awards granted in period \| $			$ 0.4	$ 2.3
Award vesting period (in years)				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]
Number of shares granted (in shares) \| shares					61,432
Fair value of share-based awards granted in period \| $					$ 2.0
Award vesting period (in years)					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]
Number of shares granted (in shares) \| shares				502,475
Fair value of share-based awards granted in period \| $				$ 2.3
Award vesting period (in years)			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]
Number of shares granted (in shares) \| shares					113,383
Fair value of share-based awards granted in period \| $					$ 0.9
Award vesting period (in years)					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]
Number of shares granted (in shares) \| shares				158,806
Time Restricted Shares \| 2013 Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares					69,358
Director \| Time Based Long-Tern Incentive Plan Unit \| 2019 Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares			171,153				31,117		76,718
Fair value of share-based awards granted in period \| $			$ 1.1				$ 0.2		$ 1.1
Award vesting period (in years)									3 years
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| 2019 Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| 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]
Number of shares granted (in shares) \| shares				624,380
Fair value of share-based awards granted in period \| $				$ 4.4
Award vesting period (in years)										3 years
Award vesting percentage of award face amount (as a percent)							125.00%			125.00%
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| Vest immediately
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares				23,049	26,056
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| Vest over three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares				601,331	308,896
Award vesting period (in years)				3 years	3 years
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| Vest in two equal installments
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting installments \| vesting_installment				2	2
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| 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]
Number of shares granted (in shares) \| shares					334,952
Fair value of share-based awards granted in period \| $					$ 4.6
Executive Officer \| Market Based Long-Term Incentive Plan Unit \| 2019 Plan Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted (in shares) \| shares			116,927	3,358,767
Fair value of share-based awards granted in period \| $			$ 0.5	$ 14.0
Reduction of grants (in shares) \| 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]
Number of shares granted (in shares) \| shares					1,806,520
Fair value of share-based awards granted in period \| $					$ 12.8
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) \| 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) \| shares							11,000,000.0			11,000,000.0			11,000,000.0
Number of shares that remain available for future issuance (in shares) \| 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 (in years)										60 years
Minimum \| Long-Term Incentive Plan Units and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in terms)										2 years	2 years
Risk free interest rate (as a percent)											2.48%
Expected volatility rate (as a percent)											17.00%
Minimum \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)										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 (in years)			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 (in years)										65 years
Maximum \| Long-Term Incentive Plan Units and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in terms)										5 years 6 months	5 years 3 months 18 days
Risk free interest rate (as a percent)											2.63%
Expected volatility rate (as a percent)											22.00%
Maximum \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)										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 (in years)			4 years
Number of vesting installments \| vesting_installment			3