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Stock Compensation Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock Compensation Plans: |  |  |  |
Stock compensation expense | $ 98.0 | $ 83.0 | $ 332.0 | $ 263.0
Stock options |  |  |  |
Stock Compensation Plans: |  |  |  |
Stock options granted in period (shares) | 36,900 | 17,100 | 1,278,700 | 1,282,400
Award vesting period |  |  | 3 years |
Award expiration period |  |  | 10 years |
Unrecognized compensation cost | $ 272.0 |  | $ 272.0 |
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 | 4,600 | 6,000
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) | 8,900 | 5,000 | 363,100 | 420,900
Award vesting period |  |  | 3 years |
Unrecognized compensation cost | $ 257.0 |  | $ 257.0 |
Remaining period over which to recognize unrecognized compensation expense |  |  | 2 years |

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