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Collaboration and Licensing Agreements (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Dec. 31, 2023
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Prepaid expenses and other current assets	$ 1,757.0		$ 1,757.0	$ 2,028.1
Variable Interest Entity, Not Primary Beneficiary \| Mapi Pharma Ltd.
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Variable Interest Entity, Maximum Milestone Payments	90.0		90.0
Variable Interest Entity, Financial or Other Support, Amount		$ 30.0
Equity Securities, FV-NI, Unrealized Gain (Loss)	45.6
Other Assets	132.1		132.1
Gain (Loss) on Investments			62.1
Prepaid expenses and other current assets	$ 52.5		52.5
Collaborative Arrangement \| Mapi Pharma Ltd.
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Payments to Acquire in Process Research and Development			75.0
Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development and sales milestone payments			407.0
Maximum \| Collaborative Arrangement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development and sales milestone payments			$ 8.0