Goodwill and Intangible Assets (Components of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2016	Dec. 31, 2018
Intangible Assets by Major Class [Line Items]
IPR&D intangible asset impairment charges	$ 0.0	$ 15.5	$ 29.5	$ 87.5
Finite-lived intangible assets, original cost	19,726.8		19,726.8			$ 20,264.1
Finite-lived intangible assets, accumulated amortization	8,141.4		8,141.4			7,225.1
Finite-lived intangible assets, net book value	11,585.4		11,585.4			13,039.0
In-process research and development	238.9		238.9			625.6
Intangible assets, gross, excluding goodwill	19,965.7		19,965.7			20,889.7
Intangible assets, net book value, excluding goodwill	$ 11,824.3		$ 11,824.3			$ 13,664.6
Patents and technologies
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, estimated useful life, in years			15 years		15 years