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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 |  |  |
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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 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Conversion of Award, Ratio + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Converted Awards, Number + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Converted to Awards, Number + References No definition available. + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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