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Stock-Based Compensation, Option Plans (Details) - Stock Options - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Stock-Based Compensation |  |
Total intrinsic value of stock options exercised (in dollars) | $ 45.2 | $ 70.0
Total fair value of stock options vested (in dollars) | 0.6 | $ 0.5
Total compensation cost related to non-vested options not yet recognized (in dollars) | $ 137.6 |
Weighted average expected amortization period | 3 years 2 months 8 days |

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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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