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Stock Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Stock compensation |  |  |  |
Stock compensation expense | $ 77.9 | $ 48.0 | $ 194.3 | $ 155.9
Dividend yield (as percent) |  |  | 0.00% |
Assumed annualized forfeiture rate (as a percent) |  |  | 5.00% |
Share-based Payment Arrangement, Option |  |  |  |
Stock compensation |  |  |  |
Stock option grant term (in years) |  |  | 10 years |
Vesting period (in years) |  |  | 4 years |
Percentage of units vesting at the end of each calendar year (as a percent) |  |  | 25.00% |
Unrecognized compensation cost for nonvested option (in dollars) | 26.2 |  | $ 26.2 |
Vesting period of recognition of the unrecognized compensation cost of nonvested awards (in years) |  |  | 1 year 1 month 6 days |
Share-based Payment Arrangement, Option | Share-based Payment Arrangement, Tranche One |  |  |  |
Stock compensation |  |  |  |
Vesting period (in years) |  |  | 1 year |
Share-based Payment Arrangement, Option | Share-based Payment Arrangement, Tranche Two |  |  |  |
Stock compensation |  |  |  |
Vesting period (in years) |  |  | 36 months |
Restricted Stock Units (RSUs) |  |  |  |
Stock compensation |  |  |  |
Vesting period (in years) |  |  | 4 years |
Percentage of units vesting at the end of each calendar year (as a percent) |  |  | 25.00% |
Number of shares awarded for each RSU (in shares) |  |  | 1 |
Unrecognized compensation cost for nonvested option (in dollars) | 280.1 |  | $ 280.1 |
Vesting period of recognition of the unrecognized compensation cost of nonvested awards (in years) |  |  | 1 year 9 months 18 days |
Performance Shares |  |  |  |
Stock compensation |  |  |  |
Stock compensation expense | 12.3 | 4.2 | $ 19.2 | 13.4
Unrecognized compensation cost for nonvested option (in dollars) | 25.4 |  | $ 25.4 |
Vesting period of recognition of the unrecognized compensation cost of nonvested awards (in years) |  |  | 1 year 2 months 12 days |
Performance Shares | Minimum |  |  |  |
Stock compensation |  |  |  |
Vesting period (in years) |  |  | 3 years |
Performance Shares | Maximum |  |  |  |
Stock compensation |  |  |  |
Vesting period (in years) |  |  | 4 years |
Escient |  |  |  |
Stock compensation |  |  |  |
Asset acquisition, compensation expense |  |  | $ 31.5 |
Research and Development Expense |  |  |  |
Stock compensation |  |  |  |
Stock compensation expense | 45.8 | 26.9 | 117.1 | 90.7
Selling, General and Administrative Expenses |  |  |  |
Stock compensation |  |  |  |
Stock compensation expense | 31.5 | 20.3 | 75.6 | 62.8
Cost of Sales |  |  |  |
Stock compensation |  |  |  |
Stock compensation expense | $ 0.6 | $ 0.8 | $ 1.6 | $ 2.4

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