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Stock-Based Compensation, Option Plans (Details) - Stock Options - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Stock-Based Compensation |  |
Total intrinsic value of stock options exercised (in dollars) | $ 28.9 | $ 45.2
Total fair value of stock options vested (in dollars) | 0.4 | $ 0.6
Total compensation cost related to non-vested options not yet recognized (in dollars) | $ 165.2 |
Weighted average expected amortization period | 3 years 3 months |

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