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Litigation (Detail) (USD $) In Millions, unless otherwise specified			1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2011 Zonegran [Member]	Dec. 31, 2010 Zonegran [Member]
Loss Contingencies [Line Items]
Litigation settlement, gross			$ 203.5
Settlement reserve charge	$ 1.0	$ 0.7		$ 206.3

Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

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