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Stock Compensation Plans (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Stock Compensation Plans: |  |
Stock compensation expense | $ 147.0 | $ 134.0
Stock options |  |
Stock Compensation Plans: |  |
Stock options granted in period (shares) | 1,372,400 | 1,225,000
Award vesting period | 3 years |
Award expiration period | 10 years |
Unrecognized compensation cost | $ 380.0 |
Remaining period over which to recognize unrecognized compensation expense | 2 years |
Restricted stock |  |
Stock Compensation Plans: |  |
Award vesting period | 1 year |
Unrecognized compensation cost | $ 0.2 |
Remaining period over which to recognize unrecognized compensation expense | 1 month |
Restricted stock units |  |
Stock Compensation Plans: |  |
Awards other than stock options granted in period (shares) | 423,600 | 345,100
Award vesting period | 3 years |
Unrecognized compensation cost | $ 378.0 |
Remaining period over which to recognize unrecognized compensation expense | 2 years |

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