Goodwill and Intangible Assets (Components of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2023
Intangible Assets by Major Class [Line Items]
Intangible asset disposal & impairment charges	$ 0.0	$ 32.0
Finite-lived intangible assets, original cost	33,830.4			$ 34,178.1
Finite-lived intangible assets, accumulated amortization	15,690.8			15,316.4
Finite-lived intangible assets, net book value	18,139.6			18,861.7
In-process research and development	994.1			319.4
Intangible assets, gross, excluding goodwill	34,824.5			34,497.5
Intangible assets, net book value, excluding goodwill	$ 19,133.7			$ 19,181.1
Patents and technologies
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, estimated useful life, in years	13 years			13 years
Licensing Agreements
Intangible Assets by Major Class [Line Items]
Write down of intangible assets		$ 32.0	$ 172.9