Goodwill and Intangible Assets (Components of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Intangible Assets by Major Class [Line Items]
Intangible asset impairment charges	$ 83.4	$ 0.0
Finite-lived intangible assets, original cost	39,648.8		$ 40,404.1
Finite-lived intangible assets, accumulated amortization	11,239.9		10,801.6
Finite-lived intangible assets, net book value	28,408.9		29,602.5
In-process research and development	80.7		80.7
Intangible assets, gross, excluding goodwill	39,729.5		40,484.8
Intangible assets, net book value, excluding goodwill	$ 28,489.6		$ 29,683.2
Patents and technologies
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, estimated useful life, in years	15 years		15 years