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Asset Impairment, Restructuring, and Other Special Charges (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 77.8	$ 127.8	$ 601.0
Asset impairment and other special charges	497.8	$ 139.1	283.9
Asset impairment charges			151.5
Impairment of intangibles			50.0
United States
Restructuring Cost and Reserve [Line Items]
Severance costs			368.3
Outside US
Restructuring Cost and Reserve [Line Items]
Severance costs			232.7
Puerto Rico
Restructuring Cost and Reserve [Line Items]
Asset impairment and other special charges			$ 43.4
Loxo Oncology, Inc.
Restructuring Cost and Reserve [Line Items]
Asset impairment and other special charges	$ 400.7