Intangible Assets and Goodwill - Changes in Goodwill (Details)	9 Months Ended
	Sep. 30, 2024 USD ($)
Summary of roll forward of the changes in goodwill
Goodwill, beginning of period	$ 6,219,200,000
Other	5,400,000
Goodwill, end of period	6,485,800,000
Accumulated impairment losses related to goodwill	0
Human Immunology Biosciences
Summary of roll forward of the changes in goodwill
Goodwill resulting from acquisition	256,500,000
Reata Pharmaceuticals, Inc
Summary of roll forward of the changes in goodwill
Goodwill resulting from acquisition	4,700,000
Goodwill, end of period	$ 469,200,000