Segmental Reporting (Revenue by Product) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue from External Customer [Line Items]
Product sales	$ 1,194.9	$ 1,054.5	$ 3,541.8	$ 3,309.1
VYVANSE
Revenue from External Customer [Line Items]
Product sales	299.2	247.1	897.9	773.3
ADDERALL XR
Revenue from External Customer [Line Items]
Product sales	81.4	102.2	293.5	347.5
INTUNIV
Revenue from External Customer [Line Items]
Product sales	80.8	69.0	248.9	206.6
LIALDA and MEZAVANT
Revenue from External Customer [Line Items]
Product sales	141.9	104.4	379.9	288.5
PENTASA
Revenue from External Customer [Line Items]
Product sales	70.6	67.0	215.2	196.7
FOSRENOL
Revenue from External Customer [Line Items]
Product sales	51.9	38.1	136.3	126.8
XAGRID
Revenue from External Customer [Line Items]
Product sales	24.2	22.0	74.1	70.7
Other Products
Revenue from External Customer [Line Items]
Product sales	33.0	33.6	96.4	115.5
REPLAGAL
Revenue from External Customer [Line Items]
Product sales	108.5	121.7	336.6	379.3
ELAPRASE
Revenue from External Customer [Line Items]
Product sales	129.1	110.5	392.6	358.3
VPRIV
Revenue from External Customer [Line Items]
Product sales	87.8	74.9	251.9	229.3
FIRAZYR
Revenue from External Customer [Line Items]
Product sales	62.6	30.3	153.8	81.7
DERMAGRAFT
Revenue from External Customer [Line Items]
Product sales	$ 23.9	$ 33.7	$ 64.7	$ 134.9