The maximum value of common stock which the entity is authorized to issue under the program.

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Common Stock Value, Remaining To Be Authorized Under Continuous Equity Program

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Represents the compensation received by sales agent relating to a continuous equity program.

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Shares Issued, Weighted Average Price Per Share

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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The cash inflow from the additional capital contribution to the entity.

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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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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Number of new stock issued during the period.

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Number of shares (or other type of equity) forfeited during the period.

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Number of share options (or share units) exercised during the current period.

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Equity (Details 2) - USD ($)	3 Months Ended		6 Months Ended
Equity (Details 2) - USD ($)	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	280,000,000		280,000,000		280,000,000
Preferred stock, shares authorized (in shares)	50,000,000		50,000,000		50,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			69,686
Common stock issued through the dividend reinvestment plan (in shares)			1,092	1,135
Number of shares of stock grants withheld (in shares)			75,195	67,854
Stock Issued During Period, Shares, Employee Stock Purchase Plans			7,156
Stock issued during period, shares, share-based compensation, forfeited (in shares)			1,438
Issuance of common stock, net			$ 206,193,000	$ 833,000
Continuous Equity Programs CEP IV and CEP V [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues			994,634
Continuous Equity Program CEP IV
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues		755,054
Maximum value of shares of common stock that can be sold (in dollars)		$ 1,000,000,000
Issuance of common stock, net	$ 0	$ 147,450,000
Continuous Equity Program CEP V [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues			239,580
Maximum value of shares of common stock that can be sold (in dollars)	1,000,000,000		$ 1,000,000,000
Shares Issued, Weighted Average Price Per Share			$ 208.70
Issuance of common stock, net			$ 49,250,000
Common stock value, remaining to be authorized under continuous equity program	$ 950,000,000		$ 950,000,000
Maximum \| Continuous Equity Program CEP IV
Class of Stock [Line Items]
Percentage of compensation received by sales agent		2.00%
Maximum \| Continuous Equity Program CEP V [Member]
Class of Stock [Line Items]
Percentage of compensation received by sales agent			1.50%
Restricted Stock and Restricted Stock Converted From Performance Shares
Class of Stock [Line Items]
Equity instruments granted (in shares)			150,359	186,382