Goodwill and Intangible Assets (Components of Intangible Assets) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2016	Dec. 31, 2017
Intangible Assets by Major Class [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 15.5	$ 0.0	$ 87.5	$ 13.0
Finite-lived intangible assets, original cost	20,407.7		20,407.7			$ 20,338.7
Finite-lived intangible assets, accumulated amortization	6,857.5		6,857.5			5,906.1
Finite-lived intangible assets, net book value	13,550.2		13,550.2			14,432.6
In-process research and development	688.8		688.8			813.2
Intangible assets, gross, excluding goodwill	21,096.5		21,096.5			21,151.9
Intangible assets, net book value, excluding goodwill	$ 14,239.0		$ 14,239.0			$ 15,245.8
Patents and technologies
Intangible Assets by Major Class [Line Items]
Finite-lived intangible assets, estimated useful life, in years			15 years		15 years