Litigation, Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			138 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2011	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 ECJ Copyright Levy	Mar. 31, 2013 ECJ Copyright Levy	Dec. 31, 2012 ECJ Copyright Levy	Jun. 30, 2013 Italy Copyright Levy	Dec. 31, 2012 Italy Copyright Levy	Dec. 31, 2011 Italy Copyright Levy
Loss Contingencies [Line Items]
Copyright levy payment				$ 100
Copyright levy accrual reversal	7.8
Copyright levy liabilities		17.6	27.7	17.6	29.1	27.7	13.6
Amount of copyright Levy overpaid							39
Amount of remaining copyright levy overpaid other than copyright levy liabilities							25.4
Copyright levy expenses								$ 5.1	$ 7.4