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Business and Basis of Presentation - Special Distribution, Corporate Conversion and Initial Public Offering (Details) - USD ($)
$ / shares in Units, $ in Millions
Apr. 19, 2017
Mar. 31, 2017
Sep. 30, 2017
Apr. 12, 2017
Dec. 31, 2016
Class of Stock [Line Items]          
Cash distributions paid   $ 190.0      
Common stock shares authorized (in shares)     140,000,000 140,000,000 140,000,000
Common stock par value (in dollars per share)     $ 0.01 $ 0.01 $ 0.01
Preferred stock shares authorized (in shares)     10,000,000 10,000,000 10,000,000
Preferred stock par value (in dollars per share)     $ 0.01 $ 0.01 $ 0.01
Common stock shares outstanding (in shares)     53,446,284   53,442,532
Common Stock | IPO          
Class of Stock [Line Items]          
Stock issued during period (in shares) 16,666,667        
Shares issued (in dollars per share) $ 19.00        
Proceeds from issuance of common stock $ 296.9        
Stock issuance costs 19.8        
Payments of stock issuance costs $ 15.9        
Common stock shares outstanding (in shares) 53,442,532