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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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No definition available.

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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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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

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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 share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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		12 Months Ended
	May 31, 2018 USD ($) shares	Mar. 31, 2018 USD ($) vesting_installment shares	Feb. 28, 2018 USD ($) vesting_installment shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility rate look-back period						6 years
Weighted-average per unit or share fair value (in USD per share) \| $ / shares						$ 8.54
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						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 \| $				$ 0.1	$ 0.2	$ 1.3	$ 0.8
Unrecognized compensation expense \| $				1.2		$ 1.2
Unrecognized compensation expense, period for recognition						2 years 4 months 24 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 \| $				4.5	$ 3.6	$ 7.9	$ 6.2
Unrecognized compensation expense \| $				$ 36.9		$ 36.9
Unrecognized compensation expense, period for recognition						2 years 6 months 1 day
Long-Term Incentive Plan Units and Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period \| $						$ 23.6
Weighted-average per unit or share fair value (in USD per share) \| $ / shares						$ 8.54
Risk free interest rate (as a percent)						2.50%
Expected volatility rate (as a percent)						17.00%
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)						2,719,801
Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units, granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		67,449
Fair value of share-based awards granted in period \| $		$ 1.7
Number of vesting installments \| vesting_installment		3
Award vesting period		4 years
Performance Based Long-Term Incentive Plan Unit \| 2013 Plan Units, granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		223,950
Fair value of share-based awards granted in period \| $		$ 1.1
Number of vesting installments \| vesting_installment		2
Award vesting period		3 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)						39,608
Time Restricted Shares \| 2013 Plan Units, granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		39,608
Long-Term Incentive Plan Unit and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term						5 years 6 months 24 days
Dividend rate (as a percent)						2.30%
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units, granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		386,876
Fair value of share-based awards granted in period \| $		$ 6.1
Executive Officer \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units, granted in February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)			238,609
Fair value of share-based awards granted in period \| $			$ 4.0
Award vesting period								3 years
Vesting percentage of award face amount								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)			25,158
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)			213,451
Award vesting period			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
Executive Officer \| Performance Based Long-Term Incentive Plan Unit \| 2013 Plan Units, granted in March 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)		1,737,917
Fair value of share-based awards granted in period \| $		$ 9.6
Non-employee Director \| Time Based Long-Tern Incentive Plan Unit \| 2013 Plan Units, granted in February 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted (in shares)	65,000
Fair value of share-based awards granted in period \| $	$ 1.0
Non-employee Director \| Time Based Long-Tern Incentive Plan Unit \| Vest ratably over three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares)				12,200,000.0		12,200,000.0
Number of shares that remain available for future issuance (in shares)				4,300,000		4,300,000