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Stock Compensation Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stock Compensation Plans: |  |  |  |
Stock compensation expense | $ 109.0 | $ 98.0 | $ 360.0 | $ 332.0
Stock options |  |  |  |
Stock Compensation Plans: |  |  |  |
Stock options granted in period (shares) | 50,700 | 36,900 | 1,455,100 | 1,278,700
Award vesting period |  |  | 3 years |
Award expiration period |  |  | 10 years |
Unrecognized compensation cost | $ 268.0 |  | $ 268.0 |
Remaining period over which to recognize unrecognized compensation expense |  |  | 2 years |
Restricted stock |  |  |  |
Stock Compensation Plans: |  |  |  |
Awards other than stock options granted in period (shares) | 0 | 0 | 6,800 | 4,600
Award vesting period |  |  | 1 year |
Unrecognized compensation cost | $ 2.0 |  | $ 2.0 |
Remaining period over which to recognize unrecognized compensation expense |  |  | 7 months |
Restricted stock units |  |  |  |
Stock Compensation Plans: |  |  |  |
Awards other than stock options granted in period (shares) | 175,600 | 8,900 | 618,700 | 363,100
Award vesting period |  |  | 3 years |
Unrecognized compensation cost | $ 329.0 |  | $ 329.0 |
Remaining period over which to recognize unrecognized compensation expense |  |  | 2 years |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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