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Other Balance Sheet Details - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Other Balance Sheet Details [Abstract] |  |
Sales rebates and reserves | $ 154.6 | $ 144.2
Accrued development costs (including unpaid development milestones) | 89.7 | 50.8
Accrued employee related costs | 57.5 | 107.5
Current branded prescription drug fee | 38.0 | 49.2
Current income taxes payable | 25.4 | 10.0
Accounts payable and other accrued liabilities | 110.0 | 99.9
Total accounts payable and accrued liabilities | $ 475.2 | $ 461.6

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