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Equity and Equity-Based Compensation - Preferred Unit Issuance (Details) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended
Sep. 13, 2017
Sep. 30, 2017
Sep. 30, 2016
Preferred Units [Line Items]      
Proceeds from issuance of preferred units, net of offering costs and expenses   $ 387.6 $ 0.0
Series A Preferred Stock      
Preferred Units [Line Items]      
Preferred units, issued (in shares) 16,000,000 16,000,000  
Dividend rate, percentage 5.875%    
Proceeds from issuance of redeemable preferred stock, gross $ 400.0    
Proceeds from issuance of preferred units, net of offering costs and expenses $ 387.6    
Redemption price per share (in usd per share) $ 25.00    
Minimum redemption notice period 30 days    
Redemption period window 60 days    
Redemption price per share in the event of change of control or tax redemption $ 25.25    
31 Day Following Change Of Control | Series A Preferred Stock      
Preferred Units [Line Items]      
Minimum redemption notice period 30 days    
Redemption period window 60 days    
Redemption price per share in the event of change of control or tax redemption $ 25.50    
Distribution increase, percent 5.00%