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Initial Public Offering - Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 02, 2014 | Jan. 15, 2014 | Sep. 30, 2014 | Sep. 30, 2013
Capital Unit [Line Items] |  |  |  |
Proceeds from IPO | $ 615.0 |  | $ 615.0 | $ 0
Stock Issued During Period, Shares, New Issues |  | 100 |  |
Distribution of IPO proceeds to CBS |  |  | 2,038.8 | 0
Proceeds from Initial Public Offering Held for Payment Upon Election of REIT Status | 100.0 |  |  |
Common Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | 23,000,000 |  |  |
Shares Issued, Price Per Share | $ 28 |  |  |
Shares Sold to Underwriter as Part of Total IPO | Common Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues | 3,000,000 |  |  |
IPO Proceeds |  |  |  |
Capital Unit [Line Items] |  |  |  |
Distribution of IPO proceeds to CBS | $ 515.0 |  |  |

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- Definition Cash outflow to owners or shareholders, excluding ordinary dividends. Includes special dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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