Commitments and Contingencies (Details Textual 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Loss Contingencies [Line Items]
Legal accruals and settlement charges	$ 36.5	$ 0.4	$ 38.1	$ 1.4
Middle District of Pennsylvania [Member]
Loss Contingencies [Line Items]
Number of former executive officers interviewed			1
Number of former chief executive officers interviewed			1
Legal accruals and settlement charges	$ 30.0
State Civil Investigative Demands [Member]
Loss Contingencies [Line Items]
Number of state attorneys general who initiated investigation			9