Retirement and Other Benefit Programs (Net Periodic Benefit Cost) (Details) - Baxalta - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
US | Pensions
Net periodic benefit cost
Service cost	$ 3.7	$ 5.5	$ 11.1	$ 7.4
Interest cost	3.9	4.8	11.7	6.4
Expected return on plan assets	(4.0)	(3.8)	(12.0)	(5.1)
Amortization of actuarial losses	0.0	0.0	0.0	0.0
Net periodic benefit cost	3.6	6.5	10.8	8.7
US | OPEB
Net periodic benefit cost
Service cost	0.4	0.4	1.2	0.5
Interest cost	0.3	0.2	0.9	0.3
Expected return on plan assets	0.0	0.0	0.0	0.0
Amortization of actuarial losses	0.0	0.0	0.0	0.0
Net periodic benefit cost	0.7	0.6	2.1	0.8
International | Pensions
Net periodic benefit cost
Service cost	9.4	7.9	28.2	10.5
Interest cost	1.2	1.4	3.6	1.8
Expected return on plan assets	(1.8)	(1.7)	(5.4)	(2.2)
Amortization of actuarial losses	0.4	0.0	1.3	0.0
Net periodic benefit cost	$ 9.2	$ 7.6	$ 27.7	$ 10.1