Litigation, Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended			6 Months Ended			3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 ARC	Jun. 30, 2012 ECJ Copyright Levy	Dec. 31, 2011 ECJ Copyright Levy	Jun. 30, 2011 ECJ Copyright Levy Cost of Sales	Jun. 30, 2011 ECJ Copyright Levy Cost of Sales
Loss Contingencies [Line Items]
Litigation settlement payments	$ (2.0)	$ (2.6)		$ 2.0
Tax levy liabilities	24.0		19.7		24.0	19.7
Reversal of previous year obligations in cost of good sold							$ 3.4	$ 5.5