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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