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Equity (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2020
Class of Stock [Line Items] |  |  |  |
Common Stock, Shares Authorized | 280,000,000 | 280,000,000 |  |
Preferred Stock, Shares Authorized | 50,000,000 | 50,000,000 |  |
Common stock shares issued in connection with stock options exercised | 1,902 |  |  |
Common stock shares issued through dividend reinvestment plan | 2,747 | 2,069 | 2,272 |
Number of shares of stock grants withheld | 74,173 | 84,710 | 68,565 |
Common shares issued under Employee Stock Purchase Plan | 20,161 |  |  |
Number of shares forfeited | 7,683 |  |  |
Treasury Stock, Shares, Acquired | 1,225,790 |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 149.99 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 316,148,000 |  |  |
Amended 2005 Stock Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 500,000,000
2020 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] |  |  |  |
Issuance of common stock, net of withholdings (in shares) | 0 |  |  |
Maximum value of shares of common stock that can be sold | $ 1,000,000,000 |  |  |
Common stock value, remaining to be authorized under continuous equity program | $ 752,878,000 |  |  |
Maximum [Member] | 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] |  |  |  |
Common stock shares issued in connection with stock grants | 165,545 | 152,502 | 187,010 |

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