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Incentive Plan (Market Performance Based Awards) (Details)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 09, 2018
Mar. 01, 2018
Feb. 27, 2018
Jan. 01, 2018
Feb. 28, 2017
Jan. 01, 2017
Jan. 31, 2018
shares
Jun. 30, 2018
USD ($)
simulation
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (shares)               105,800
Market performance-based awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period               3 years
Number of trials | simulation               100,000
Risk-Free Interest rate 2.42% 2.34%   1.98% 1.43% 1.49%    
Fair value of awards | $               $ 96.7
Award requisite service period               4 years
Market performance-based awards | Below Threshold Level                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance threshold percentage               (3.00%)
Vesting percentage               0.00%
Market performance-based awards | Threshold Level                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance threshold percentage               (3.00%)
Vesting percentage               25.00%
Market performance-based awards | Target Level                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance threshold percentage               1.00%
Vesting percentage               50.00%
Market performance-based awards | High Level                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance threshold percentage               5.00%
Vesting percentage               100.00%
Class D Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (shares)               2,165,692
Vested (shares)             363,193  
Distribution Equivalent Unit                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vested (shares)             36,246  
Restricted Stock Units (RSUs)                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Granted (shares)               590,569
Vested (shares)             49,707  
2015 Performance Grant | Market performance-based awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage     50.00%          
2015 Performance Grant | Market performance-based awards | First Vesting Period in February                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage               50.00%
2016 Performance Grant | Market performance-based awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period               3 years
2017 Performance Grant | Market performance-based awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period               3 years
2017 Performance Grant | Market performance-based awards | First Vesting Period in February                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage               50.00%
2017 Performance Grant | Market performance-based awards | Second Vesting Period in February                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage               50.00%
2018 Performance Grant | Market performance-based awards | First Vesting Period in February                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage               50.00%
2018 Performance Grant | Market performance-based awards | Second Vesting Period in February                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage               50.00%