Commitments, Contingencies And Guarantees (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013 signs permits lawsuits
Stockholder Litigation [Abstract]
Derivative lawsuits	2
Lawsuit filing date	2012-03-31
Breach date	Dec. 31, 2009
Binding memorandum of understanding date	Mar. 28, 2013
Stipulation of Settlement execution date	Jul. 08, 2013
Stipulation of Settlement 8-K filing date	Jul. 09, 2013
Settlement approval date	Sep. 09, 2013
Right to appeal expiration date	Oct. 09, 2013
Repayment demand notification date	Oct. 19, 2013
Demand repayment amount	$ 200
Repayment date	Nov. 08, 2013
Declared dividend	200
Dividend payment date	Nov. 08, 2013
Note amendment date	Oct. 23, 2013
Dividend declaration 8-K filing date	Oct. 21, 2013
Note amendment 8-K filing date	Oct. 23, 2013
Los Angeles Litigation [Abstract]
Lawsuit date	Dec. 31, 2008
Settlement agreement date	Nov. 30, 2006
Ruling date	Jan. 31, 2010
Conversion from static to digital	83
Upholding date	Dec. 10, 2012
Review request date	2013-01-22
Review denial date	2013-02-27
Invalidation date	Apr. 12, 2013
Digital modernization permits issued to Company	82
Digital modernization permits issued to competitor	13
Turn off date	Apr. 15, 2013
Further proceedings conducted date	Apr. 16, 2013
Permitting history request date	Sep. 16, 2013
Evidentiary hearing scheduled date	Nov. 08, 2013
Attorney's fees motion hearing date	Dec. 11, 2013
Guarantees [Abstract]
Surety bonds outstanding	53.1
Commercial standby letters of credit outstanding	121.0
Cash securing letters of credit	36.3
Letters of credit as collateral	2.0
Outstanding bank guarantees related to international subsidiaries	51.4
Cash collateral of bank guarantees	$ 13.7