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Equity - Narrative (Details) (USD $) | 0 Months Ended | 9 Months Ended |  |  | 0 Months Ended |  | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 16, 2014 | Jan. 15, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Apr. 02, 2014 | Dec. 31, 2013 | Apr. 02, 2014 Common Stock | Mar. 14, 2014 Common Stock | Mar. 13, 2014 Common Stock | Apr. 02, 2014 Shares Sold to Underwriter as Part of Total IPO Common Stock | Dec. 31, 2014 Subsequent Event | Dec. 15, 2014 Subsequent Event | Nov. 20, 2014 Subsequent Event | Nov. 18, 2014 Subsequent Event | Oct. 29, 2014 Subsequent Event | Sep. 30, 2014 CBS Corp. | Dec. 31, 2013 CBS Corp. | Dec. 30, 2014 CBS Corp. Subsequent Event
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 20, 2014 | Nov. 18, 2014 |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 100 |  |  |  |  | 23,000,000 |  |  | 3,000,000 |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  |  |  |  | 970,000 |  |  |  |  |  |  |  |  |  |
Common Stock, Issued |  |  | 120,010,462 |  | 120,000,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Outstanding |  |  | 120,010,462 |  | 120,000,000 | 0 |  | 97,000,000 | 100 |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share |  |  |  |  |  |  | $ 28 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Authorized |  |  | 450,000,000 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par Value |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Exchanged by Parent In Tender Offer | 97,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
% ownership by parent | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Announced |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 29, 2014 |  |  |
Distributed Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 547,700,000 |  |  |
Payments of Capital Distribution |  |  | 2,038,800,000 | 0 |  |  |  |  |  |  | 109,500,000 |  |  |  |  |  |  |
Dividends Payable, Date to be Paid |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2014 | Dec. 15, 2014 |  |  |  |  |  |
Proceeds from Initial Public Offering Held for Payment Upon Election of REIT Status |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Related Parties, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 0 | $ 9,500,000

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