Retirement and Other Benefit Programs (Net Periodic Benefit Cost) (Details) - Baxalta - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016
U.S. pensions
Net periodic benefit cost
Service cost	$ 3.7	$ 7.4	$ 1.9
Interest cost	3.9	7.8	1.6
Expected return on plan assets	(4.0)	(8.0)	(1.3)
Amortization of actuarial losses		0.0	0.0
Net periodic benefit cost	3.6	7.2	2.2
International pensions
Net periodic benefit cost
Service cost	9.4	18.8	2.6
Interest cost	1.2	2.4	0.4
Expected return on plan assets	(1.8)	(3.6)	(0.5)
Amortization of actuarial losses		0.9	0.0
Net periodic benefit cost	8.8	18.5	2.5
OPEB (U.S.)
Net periodic benefit cost
Service cost	0.4	0.8	0.1
Interest cost	0.3	0.6	0.1
Expected return on plan assets	0.0	0.0	0.0
Amortization of actuarial losses		0.0	0.0
Net periodic benefit cost	$ 0.7	$ 1.4	$ 0.2