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13. Subsequent Event (Details) (USD $)
In Millions
Oct. 04, 2011
Subsequent Event [Line Items] 
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low$ 164.8
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred5.0
Business Acquisition, Cost of Acquired Entity, Purchase Price159.8
Business Acquisition, Contingent Consideration, Potential Cash Payment$ 48