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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 22, 2018
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |
Preferred stock, shares authorized | 100,000 | 100,000 |  |
Preferred stock, par value per share | $ 100 | $ 100 |  |
Common stock, shares authorized | 500,000,000 | 500,000,000 |  |
Common stock, par value per share | $ 1 | $ 1 |  |
Common stock, shares issued | 258,981,638 | 258,551,748 |  |
Number of treasury shares held | 115,228,597 | 114,249,432 |  |
Share Repurchases [Line Items] |  |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  |  | $ 700,000
Payments for Repurchase of Common Stock | $ 106,279 | $ 143,280 | $ 894,977 |
February 2018 Authorization [Member] |  |  |  |
Share Repurchases [Line Items] |  |  |  |
Shares repurchased | 979,165 | 1,343,622 |  |
Number of shares authorized to be repurchased |  | 20,000,000 |  |
Payments for Repurchase of Common Stock | $ 106,279 | $ 143,280 |  |
Average price per share for repurchased shares (in dollars per share) | $ 108.54 | $ 106.64 |  |
Remaining number of shares authorized to be repurchased | 7,380,879 |  |  |
November 2020 Authorization [Member] |  |  |  |
Share Repurchases [Line Items] |  |  |  |
Number of shares authorized to be repurchased | 20 |  |  |

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