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Stock Compensation Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock Compensation Plans: |  |  |  |
Stock compensation expense | $ 104.0 | $ 100.0 | $ 251.0 | $ 234.0
Stock options |  |  |  |
Stock Compensation Plans: |  |  |  |
Stock options granted in period (shares) | 32,000 | 16,800 | 1,404,400 | 1,241,800
Award vesting period |  |  | 3 years |
Award expiration period |  |  | 10 years |
Unrecognized compensation cost | $ 323.0 |  | $ 323.0 |
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) | 6,800 | 4,600 | 6,800 | 4,600
Award vesting period |  |  | 1 year |
Unrecognized compensation cost | $ 0.3 |  | $ 0.3 |
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) | 19,500 | 9,100 | 443,100 | 354,200
Award vesting period |  |  | 3 years |
Unrecognized compensation cost | $ 323.0 |  | $ 323.0 |
Remaining period over which to recognize unrecognized compensation expense |  |  | 2 years |

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