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Collaboration and Licensing Agreements (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 30, 2015	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contingent consideration liability		$ 215.1	$ 375.0	$ 199.7
Proceeds from sale of assets and subsidiaries		364.1	1,950.0	$ 96.7
Collaborative Arrangement \| Mapi Pharma Ltd.
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Acquired IPR&D		75.0
Theravance
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Upfront payments		18.5
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement \| Theravance
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Research and development		50.0
Maximum
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development and sales milestone payments		415.0
Maximum \| Theravance
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development and sales milestone payments	$ 293.0
Fiscal Year 2017 \| Maximum \| Collaborative Arrangement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Development and sales milestone payments		89.0
Respiratory delivery platform
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contingent consideration liability		$ 177.6	$ 132.0