Partners' Capital, Equity and Incentive Compensation Plans (Summary of Assumptions and Fair Values for Restricted Stock and Options to Purchase Shares of Class A Common Stock Granted) (Details)	3 Months Ended
Mar. 31, 2019 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of FFO units and restricted stock granted	42.01
Fair value of TSR units granted	54.64
Fair value of options granted	$ 7.56
Expected term (years)	5 years 6 months
Expected volatility	28.00%
Expected dividend yield	4.19%
Expected risk-free interest rates	2.56%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock granted	$ 42.01
Fair value of options granted	$ 7.56
Expected risk-free interest rates	2.56%
Class O Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (years)	5 years 6 months

Fair Value Per Share Of Funds From Operations And Restricted Stock Units Granted

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Fair Value Per Share Of Restricted Stock Units Granted

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Fair value per share of Total Shareholders Return awards granted

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Weighted Average Fair Value Of Options Granted During Period

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

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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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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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