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Income Taxes - Narrative (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Taxes [Abstract]
Unrecognized Tax Benefits	$ 1.2		$ 1.2		$ 4.0
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	0.8		0.8
Deferred Tax Benefit Due To REIT Conversion	232.3		232.3
Capital Distribution Per Share	$ 0.37
Effective Income Tax Rate Reconciliation, Percent, Excluding Non-Cash Benefit Resulting From REIT Conversion	27.70%	43.90%	39.30%	43.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
CBS Corp.
Related Party Transaction [Line Items]
Unrecognized Tax Benefit Transferred to Parent			$ 2.1

X

- Definition

Deferred Tax Benefit Due To REIT Conversion

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Effective Income Tax Rate Reconciliation, Percent, Excluding Non-Cash Benefit Resulting From REIT Conversion

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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