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Stock-Based Compensation - Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 9 Months Ended 0 Months Ended
Jul. 16, 2014
Mar. 27, 2014
Restricted Stock Units (RSUs)
Sep. 30, 2014
Restricted Stock Units (RSUs)
Sep. 30, 2014
Restricted Stock Units (RSUs)
Minimum
Sep. 30, 2014
Restricted Stock Units (RSUs)
Maximum
Sep. 30, 2014
Performance Restricted Stock Units (PRSUs)
Minimum
Sep. 30, 2014
Performance Restricted Stock Units (PRSUs)
Maximum
Sep. 30, 2014
Stock options
Jul. 16, 2014
Omnibus Stock Incentive Plan
Mar. 18, 2014
Omnibus Stock Incentive Plan
Mar. 27, 2014
Omnibus Stock Incentive Plan
Restricted Stock Units (RSUs)
Mar. 27, 2014
CBS Corp. Equity and Incentive Plan
Restricted Stock Units (RSUs)
Jul. 16, 2014
CBS Corp. Equity and Incentive Plan
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                          
Compensation Not yet Recognized, Share-based Awards Other than Options     $ 20.6                    
Compensation Cost Not yet Recognized, Period for Recognition     2 years 11 months         2 years 7 months          
Compensation Not yet Recognized, Stock Options               $ 0.9          
Non-vested CBS RSUs converted to Outdoor RSUs                       256,172  
Non-vested Outdoor RSUs converted from CBS RSUs                     561,021    
Conversion of Award Ratio   2.2                      
Number of Shares Available for Grant                   8,000,000      
Award Vesting Period       3 years 4 years                
Payout on Stock-Based Compensation Award (percent)           0.00% 120.00%            
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Converted Awards, Number                         (219,741)
Share-based Compensation Arrangements, Share-based Payment Awards, Options, Converted to Awards, Number                 409,207        
Share-based Compensation Arrangements, Share-based Payment Awards, Options, Conversion Award Ratio 1.9