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Employee Stock Plans - Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock Option Activity |  |  |
Outstanding beginning balance (in shares) | 1,820,000 |  |
Granted (in shares) | 50,000 | 50,000 | 0
Exercised (in shares) | (647,000) |  |
Outstanding ending balance (in shares) | 1,223,000 | 1,820,000 |
Stock Option Weighted Average Exercise Price Per Share |  |  |
Outstanding begging balance (in dollars per share) | $ 15.02 |  |
Granted (in dollars per share) | 32.64 |  |
Exercised (in dollars per share) | 11.30 |  |
Outstanding ending balance (in dollars per share) | $ 17.71 | $ 15.02 |
Stock Option Activity, Additional Disclosures |  |  |
Options outstanding, Weighted average remaining contractual term | 1 year 11 months 23 days |  |
Options outstanding, Aggregate intrinsic value (in dollars) | $ 26.2 |  |
Options vested and exercisable, Number of Options (in shares) | 1,075,000 |  |
Options vested and exercisable, Weighted average exercise price per share (in dollars per share) | $ 17.47 |  |
Options vested and exercisable, Weighted average remaining contractual term | 1 year 11 months 4 days |  |
Options exercisable, Aggregate intrinsic value (in dollars) | $ 23.3 |  |

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