Number of Vesting Installments

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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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No definition available.

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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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No definition available.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
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-Subparagraph (h)(1)(i)
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- Definition

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

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- Definition

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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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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).

+ References

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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

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

+ References

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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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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- Definition

The 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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No definition available.

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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Equity - Incentive and Share-based Compensation (Details) $ / shares in Units, $ in Millions	1 Months Ended				6 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) vesting_installment shares	May 31, 2018 USD ($) shares	Mar. 31, 2018 USD ($) vesting_installment shares	Feb. 28, 2018 USD ($) vesting_installment shares	Oct. 31, 2019 USD ($) shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares	May 16, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate look-back period						6 years
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest						10 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Unvested beginning balance, per share (USD per share) \| $ / shares						$ 9.68
Vested, weighted average grant price, per share (USD per share) \| $ / shares						15.98
Granted, weighted average grant price, per share (USD per share) \| $ / shares						9.56
Forfeited or unearned, weighted average grant price, per share (USD per share) \| $ / shares						7.34
Unvested ending balance, per share (USD per share) \| $ / shares						$ 9.73	$ 9.68
Age of grantee at which LTIP unit and restricted stock awards immediately vest						60 years
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 \| $						$ 27.9	$ 23.6	$ 19.4
Expected term							2 years 9 months 18 days
Risk-free interest rate							2.50%
Expected price volatility							20.00%
Share-based compensation arrangement by share-based payment award, fair value assumptions, expected dividend rate						2.40%	2.30%	2.05%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Granted, weighted average grant price, per share (USD per share) \| $ / shares						$ 9.56	$ 8.54	$ 13.77
Fair value vested in period \| $						$ 10.1	$ 7.7	$ 7.6
Long-Term Incentive Plan Units and Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term						2 years		2 years 9 months 18 days
Risk-free interest rate						2.48%		1.55%
Expected price volatility						17.00%		20.00%
Long-Term Incentive Plan Units and Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term						5 years 3 months 18 days
Risk-free interest rate						2.63%
Expected price volatility						22.00%
Long-Term Incentive Plan Unit
Restricted Stock and LTIP Unit Activity [Roll Forward]
Unvested beginning balance (in shares)						5,702,821
Vested (in shares)						(598,402)
Granted (in shares)						2,854,698
Forfeited or unearned (in shares)						(1,972,548)
Unvested ending balance (in shares)						5,986,569	5,702,821
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						10 years
Time Based Long-Tern Incentive Plan Unit \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Time Based Long-Tern Incentive Plan Unit \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						4 years
Restricted Stock
Restricted Stock and LTIP Unit Activity [Roll Forward]
Unvested beginning balance (in shares)						91,158
Vested (in shares)						(35,724)
Granted (in shares)						69,358
Forfeited or unearned (in shares)						(5,874)
Unvested ending balance (in shares)						118,918	91,158
2013 Plan Units \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $	$ 2.0
Award vesting period	4 years
Number of vesting installments \| vesting_installment	3
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	61,432
2013 Plan Units \| Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $	$ 0.9
Number of vesting installments \| vesting_installment	2
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	113,383
2013 Plan Units \| Time Restricted Shares
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	69,358
2013 Plan Units, Granted in March 2018 \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $			$ 1.7
Award vesting period			4 years
Number of vesting installments \| vesting_installment			3
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)			67,449
2013 Plan Units, Granted in March 2018 \| Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $			$ 1.1
Award vesting period	3 years
Number of vesting installments \| vesting_installment			2
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)			223,950
2013 Plan Units, Granted in March 2018 \| Time Restricted Shares
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)			39,608
Awards that Meet Age and Service Requirements for Vesting
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Noncash share-based compensation expense recognized \| $						$ 2.0	$ 1.8	$ 1.0
Unrecognized compensation expense \| $						$ 1.1
Unrecognized compensation expense, period for recognition (in years)						2 years 2 months 12 days
Awards that Do Not Meet Age and Service Requirements for Vesting
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Noncash share-based compensation expense recognized \| $						$ 18.8	$ 17.0	$ 13.1
Unrecognized compensation expense \| $						$ 28.7
Unrecognized compensation expense, period for recognition (in years)						2 years 1 month 6 days
Director \| 2019 Plan Units \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $					$ 1.1
Award vesting period					3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)					76,718
Director \| 2013 Plan Units \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $		$ 1.0
Award vesting period		3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)		65,000
Executive Officer \| 2013 Plan Units \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $	$ 6.4
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	461,693
Executive Officer \| 2013 Plan Units \| Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $	$ 12.8
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	1,806,520
Executive Officer \| 2013 Plan Units, Connected With Bonus Program \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $	$ 4.6
Award vesting period						3 years
Award vesting percentage of award face amount						125.00%
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	334,952
Executive Officer \| 2013 Plan Units, Granted in March 2018 \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $			$ 6.1
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)			386,876
Executive Officer \| 2013 Plan Units, Granted in March 2018 \| Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $			$ 9.6
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)			1,737,917
Executive Officer \| 2013 Plan Units, Granted in March 2017 \| Performance Based Long-Term Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Executive Officer \| 2013 Plan Units, Granted in February 2018 \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $				$ 4.0
Award vesting period								3 years
Award vesting percentage of award face amount								125.00%
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				238,609
Executive Officer \| Vest immediately \| Time Based Long-Tern Incentive Plan Unit
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	26,056			25,158
Executive Officer \| Vest over three years \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years			3 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)	308,896			213,451
Executive Officer \| Vest in two equal annual installments \| Time Based Long-Tern Incentive Plan Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting installments \| vesting_installment	2			2
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (shares)						11,000,000.0			11,000,000.0
Number of shares that remain available for future issuance (shares)						11,500,000