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Stock Compensation Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Stock Compensation Plans: |  |  |  |
Stock compensation expense | $ 153.0 | $ 168.0 | $ 367.0 | $ 376.0
Stock options |  |  |  |
Stock Compensation Plans: |  |  |  |
Stock options granted in period (shares) | 13,800 | 21,500 | 1,358,400 | 4,257,200
Award vesting period |  |  | 3 years |
Award expiration period |  |  | 10 years |
Unrecognized compensation cost | $ 399.0 |  | $ 399.0 |
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) | 13,400 | 10,300 | 13,400 | 10,300
Award vesting period |  |  | 1 year |
Unrecognized compensation cost | $ 3.0 |  | $ 3.0 |
Remaining period over which to recognize unrecognized compensation expense |  |  | 10 months |
Restricted stock units |  |  |  |
Stock Compensation Plans: |  |  |  |
Awards other than stock options granted in period (shares) | 16,700 | 21,500 | 1,099,800 | 1,535,900
Award vesting period |  |  | 3 years |
Unrecognized compensation cost | $ 580.0 |  | $ 580.0 |
Remaining period over which to recognize unrecognized compensation expense |  |  | 2 years |

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