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Equity-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jan. 01, 2018
Sep. 22, 2017
Jan. 31, 2019
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period         10 years    
Common Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Equity-based compensation cost         $ 9.6    
Weighted average recognition period         1 year 9 months 11 days    
Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average recognition period         2 years 9 months 15 days    
Weighted-average recognition period         $ 5.2    
Chief Executive Officer | Common Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)       7,500,000      
Conversion of units (in shares)           7,500,000  
President | Common Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)       1,500,000      
Hurdle amount (in dollars per share)       $ 11.69 $ 11.69    
Conversion of units (in shares)           472,000  
2005 Common Membership Unit Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period         10 years    
Intrinsic value of units exercised           $ 1.2 $ 0.9
2017 Plan | RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares)         1,555,000    
Weighted average recognition period           2 years 5 months 23 days  
Equity-based compensation cost         $ 29.9    
2017 Plan | Class A              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares authorized (in shares)   25,000,000          
Potential increase in authorized shares (in shares)   17,000,000          
Potential percentage increase in authorized shares   5.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 7,900,000   3,200,000        
Director Compensation Program | RSAs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Weighted average recognition period         5 months 9 days    
Equity-based compensation cost         $ 0.4