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Stock-Based Compensation - Valuation Assumptions (Details) - Outperformance Program	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free rate	2.57%	2.37%	1.47%
Dividend yield	3.00%	2.90%	2.30%
One-Time Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free rate	1.63%
Dividend yield	3.20%
The Company
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected price volatility	22.00%	20.00%	24.00%
The Company | One-Time Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected price volatility	23.00%
REIT Index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected price volatility	18.00%	18.00%	17.00%
REIT Index | One-Time Retention Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected price volatility	18.00%

X

- 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.

+ 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
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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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.

+ References

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-Topic 718
-SubTopic 10
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-Paragraph 2
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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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