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Equity, Option Plans (Details) - Stock Options - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-Based Compensation |  |  |
Total intrinsic value of stock options exercised (in dollars) | $ 436.1 | $ 329.6 | $ 188.1
Total fair value of stock options vested (in dollars) | 62.4 | $ 57.3 | $ 51.0
Total compensation cost related to non-vested options not yet recognized (in dollars) | $ 177.3 |  |
Weighted average expected amortization period | 3 years 4 months 24 days |  |

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