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Stock-Based Compensation, Option Plans (Details) - Stock Options - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Stock-Based Compensation |  |
Total intrinsic value of stock options exercised (in dollars) | $ 34.3 | $ 28.9
Total fair value of stock options vested (in dollars) | 0.6 | $ 0.4
Total compensation cost related to non-vested options not yet recognized (in dollars) | $ 187.8 |
Weighted average expected amortization period | 3 years 3 months 3 days |

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