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Commitments, Contingencies And Guarantees (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
permits
signs
Stockholder Litigation [Abstract]  
Special litigation committee formation date April 4, 2012
Motion to stay filing date June 20, 2012
Expedited trial motion filing date June 27, 2012
Granting motion date July 23, 2012
Motion to extend stay filing date January 23, 2013
Extending motion granting date January 24, 2013
Binding memorandum of understanding date March 28, 2013
MOU 8-K filing date April 3, 2013
Los Angeles Litigation [Abstract]  
Conversion from static to digital 83
Upholding date December 10, 2012
Review request date January 22, 2013
Review denial date February 27, 2013
Invalidation date April 12, 2013
Digital modernization permits issued to Company 82
Digital modernization permits issued to competitor 13
Turn off date April 15, 2013
Further proceedings conducted date April 16, 2013
Guarantees [Abstract]  
Surety bonds outstanding $ 51.0
Commercial standby letters of credit outstanding 124.2
Cash securing letters of credit 56.3
Letters of credit as collateral 9.1
Outstanding bank guarantees related to international subsidiaries 47.0
Cash collateral of bank guarantees $ 4.5