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, 2020 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of TSR units granted	79.18
Fair value of options granted	$ 9.35
Expected term (years)	5 years 6 months
Expected volatility	27.00%
Expected dividend yield	3.31%
Expected risk-free interest rates	0.61%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of FFO units and restricted stock granted	56.84
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of FFO units and restricted stock granted	57.28

Fair Value Per Share Of Funds From Operations And 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 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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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 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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