Other Income (Details Textual) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011
Other Income (Textual) [Abstract]
Amortization expense included in earnings (losses) on equity method investment	$ 0.3	$ 0.8

Name:

wpi_AmortizationExpenseIncludedInEarningsLossesOnEquityMethodInvestment

Namespace Prefix:

wpi

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

duration