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Consolidated Statements of Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Stockholders' Equity [Abstract] |  |  |
Net issuances of shares held in treasury in settlement of stock-based compensation (in shares) | 249,064 | 314,953 | 374,267
Number of Shares | 641,149 | 2,819,081 | 4,308,418
Repurchases of shares of common stock, average price (in dollars per share) | $ 109.22 | $ 134.95 | $ 163.69
Retirement of shares held in treasury (in shares) |  |  | 8,000,000
Retirement of shares held in treasury, average price (in dollars per share) |  |  | $ 146.27

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