Asset Impairment, Restructuring, and Other Special Charges (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Restructuring Cost and Reserve [Line Items]
Severance Costs	$ 8.3		$ 12.1	$ 37.0	$ 65.3
Asset Impairment Charges	37.2		30.3	197.9	157.5
Asset impairment, restructuring, and other special charges	45.5		42.4	234.9	222.8
Human Pharmaceutical Products [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	0.0		9.6	0.0	26.5
Asset Impairment Charges	0.0		0.9	0.0	18.0
Animal Health [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs	8.3		2.5	37.0	38.8
Asset Impairment Charges	$ 37.2		$ 29.4	$ 197.9	$ 139.5
IRELAND | Animal Health [Member]
Restructuring Cost and Reserve [Line Items]
Asset Impairment Charges		$ 87.2