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Equity, Option Plans (Details) - Stock Options - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock-Based Compensation |  |  |
Total intrinsic value of stock options exercised (in dollars) | $ 430.9 | $ 436.1 | $ 329.6
Total fair value of stock options vested (in dollars) | 71.7 | $ 62.4 | $ 57.3
Total compensation cost related to non-vested options not yet recognized (in dollars) | $ 197.3 |  |
Weighted average expected amortization period | 3 years 4 months 6 days |  |

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