Litigation, Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 ARC	Sep. 30, 2012 ECJ Copyright Levy	Dec. 31, 2011 ECJ Copyright Levy	Sep. 30, 2011 ECJ Copyright Levy Cost of Sales	Sep. 30, 2011 ECJ Copyright Levy Cost of Sales
Loss Contingencies [Line Items]
Litigation settlement payments	$ (18.5)	$ (10.9)		$ 2.0
Tax levy liabilities	26.1		19.7		26.1	19.7
Reversal of previous year obligations in cost of good sold							$ 7.2	$ 12.7