Retirement and Other Benefit Programs (Net Periodic Benefit Cost) (Details) - Baxalta - USD ($) $ in Millions	3 Months Ended	4 Months Ended
	Sep. 30, 2016	Sep. 30, 2016
U.S. pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 5.5	$ 7.4
Interest cost	4.8	6.4
Expected return on plan assets	(3.8)	(5.1)
Net periodic benefit cost	6.5	8.7
International pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	7.9	10.5
Interest cost	1.4	1.8
Expected return on plan assets	(1.7)	(2.2)
Net periodic benefit cost	7.6	10.1
OPEB
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0.4	0.5
Interest cost	0.2	0.3
Expected return on plan assets	0.0	0.0
Net periodic benefit cost	$ 0.6	$ 0.8