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v3.20.2

Equity (Details 2) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jul. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 280,000,000 |  |  | 280,000,000
Preferred stock, shares authorized (in shares) | 50,000,000 |  |  | 50,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 1,902 |  |  |
Common stock issued through the dividend reinvestment plan (in shares) | 1,967 | 1,594 |  |
Number of shares of stock grants withheld (in shares) | 73,103 | 83,602 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 8,685 |  |  |
Stock issued during period, shares, share-based compensation, forfeited (in shares) | 7,421 |  |  |
Treasury Stock, Shares, Acquired | 912,733 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 150.58 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 362,560,000 |  |  |
Issuance of common stock, net | 1,599,000 | $ 207,789,000 |  |
2020 Stock Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 500,000,000 |
Amended 2005 Stock Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 500,000,000 |
Continuous Equity Program CEP V [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Maximum value of shares of common stock that can be sold (in dollars) | 1,000,000,000 |  |  |
Common stock value, remaining to be authorized under continuous equity program | 752,878,000 |  |  |
Issuance of common stock, net | $ 0 |  |  |
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) | 165,426 | 150,359 |  |

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