Segmental Reporting (Revenue by Product) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenue from External Customer [Line Items]
Product sales	$ 1,308.1	$ 1,098.2
VYVANSE
Revenue from External Customer [Line Items]
Product sales	351.2	298.4
ADDERALL XR
Revenue from External Customer [Line Items]
Product sales	85.1	99.8
INTUNIV
Revenue from External Customer [Line Items]
Product sales	82.3	77.7
LIALDA and MEZAVANT
Revenue from External Customer [Line Items]
Product sales	128.9	100.5
PENTASA
Revenue from External Customer [Line Items]
Product sales	72.3	71.0
FOSRENOL
Revenue from External Customer [Line Items]
Product sales	41.4	42.3
XAGRID
Revenue from External Customer [Line Items]
Product sales	27.1	23.4
Other Products
Revenue from External Customer [Line Items]
Product sales	29.5	33.5
REPLAGAL
Revenue from External Customer [Line Items]
Product sales	114.3	114.0
ELAPRASE
Revenue from External Customer [Line Items]
Product sales	128.6	114.3
VPRIV
Revenue from External Customer [Line Items]
Product sales	86.9	81.6
FIRAZYR
Revenue from External Customer [Line Items]
Product sales	74.9	41.7
CINRYZE
Revenue from External Customer [Line Items]
Product sales	$ 85.6	$ 0