Asset Impairment, Restructuring, and Other Special Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2016
Severance Costs	$ 9.5	$ 31.0
Asset impairment, restructuring, and other special charges	131.4	108.0
Human Pharmaceutical Products [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	0.0	8.7
Animal Health [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	9.5	22.3
Asset Impairment Charges	121.9	$ 77.0
IRELAND | Animal Health [Member]
Restructuring Cost and Reserve [Line Items]
Asset Impairment Charges	$ 87.2