GOODWILL (Details) (USD $)	6 Months Ended
	Jun. 30, 2011		Feb. 09, 2011
Changes in goodwill
Balance at the beginning of the period	$ 822,071,000
Foreign currency translation adjustment	40,709,000
Mepha GmbH purchase accounting adjustment	(2,989,000)
Balance at the end of the period	866,272,000	[1]
Alba Therapeutics Corporation | United States
Changes in goodwill
Consolidation of an entity	2,118,000
ChemGenex Pharmaceuticals Limited | United States
Changes in goodwill
Consolidation of an entity	3,970,000
Gemin X Pharmaceuticals | United States
Changes in goodwill
Consolidation of an entity	393,000
United States
Changes in goodwill
Balance at the beginning of the period	486,619,000
Foreign currency translation adjustment	(9,000)
Balance at the end of the period	493,091,000
Europe
Changes in goodwill
Balance at the beginning of the period	335,452,000
Foreign currency translation adjustment	40,718,000
Mepha GmbH purchase accounting adjustment	(2,989,000)
Balance at the end of the period	373,181,000
Alba Therapeutics Corporation
Changes in goodwill
Balance at the beginning of the period			2,118,000
Consolidation of an entity	2,118,000
Balance at the end of the period	2,118,000		2,118,000
ChemGenex Pharmaceuticals Limited
Changes in goodwill
Consolidation of an entity	3,970,000
Gemin X Pharmaceuticals
Changes in goodwill
Consolidation of an entity	$ 393,000

[1] Amounts include assets and liabilities of our variable interest entities (VIEs). Our interests and obligations with respect to VIEs' assets and liabilities are limited to those accorded to us in our agreements with our VIEs. See Note 2 to these consolidated financial statements for amounts.