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Income Taxes - Schedule of Common Stock Distribution (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2016
Dividends Payable [Line Items]        
Qualified dividend income for purposes of Code Section 1(h)(11) $ 0.0164      
Qualified business income for purpose of Code Section 199A 0.9414      
Common dividends, per share (in dollars per share) 1.48 $ 1.480 $ 2.095  
Dividends, amount per share 1.48 1.48 8.265  
Spinoff | Spinoff        
Dividends Payable [Line Items]        
Dividends, amount per share     6.17  
Ordinary dividends        
Dividends Payable [Line Items]        
Dividends, amount per share 0.9578 1.48 1.5561  
Capital gains        
Dividends Payable [Line Items]        
Dividends, amount per share 0.5222 0 0  
Nondividend distributions        
Dividends Payable [Line Items]        
Dividends, amount per share $ 0 $ 0 $ 6.7089  
Nondividend distributions | Spinoff        
Dividends Payable [Line Items]        
Dividends, amount per share       $ 6.17