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Other Balance Sheet Details - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
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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- Definition

Accrued Branded Prescription Drug Fee

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Accrued Research And Development Expense Current

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Other balance sheet details.

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- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Amount of liabilities incurred to vendors for goods and services received, and accrued liabilities classified as other, payable within one year or the normal operating cycle, if longer.

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 605
-SubTopic 35
-Name Accounting Standards Codification
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