Segmental Reporting (Revenue by Product) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue from External Customer [Line Items]
Product sales	$ 1,576.8	$ 1,552.0	$ 4,476.2	$ 4,329.7
VYVANSE
Revenue from External Customer [Line Items]
Product sales			1,268.9	1,065.6
CINRYZE
Revenue from External Customer [Line Items]
Product sales			474.4	360.6
LIALDA/MEZAVANT
Revenue from External Customer [Line Items]
Product sales			483.0	449.1
ADDERALL XR
Revenue from External Customer [Line Items]
Product sales			259.7	280.2
INTUNIV
Revenue from External Customer [Line Items]
Product sales			45.0	279.0
PENTASA
Revenue from External Customer [Line Items]
Product sales			232.7	213.8
FOSRENOL
Revenue from External Customer [Line Items]
Product sales			132.9	136.2
XAGRID
Revenue from External Customer [Line Items]
Product sales			75.0	82.1
Other Products
Revenue from External Customer [Line Items]
Product sales			89.6	97.6
REPLAGAL
Revenue from External Customer [Line Items]
Product sales			325.5	380.7
ELAPRASE
Revenue from External Customer [Line Items]
Product sales			405.5	449.5
VPRIV
Revenue from External Customer [Line Items]
Product sales			256.2	273.0
FIRAZYR
Revenue from External Customer [Line Items]
Product sales			319.8	262.3
GATTEX/REVESTIVE
Revenue from External Customer [Line Items]
Product sales			95.2	0.0
NATPARA
Revenue from External Customer [Line Items]
Product sales			$ 12.8	$ 0.0