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Incentive Plan (Market Performance Based Awards) (Details)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 09, 2018
Mar. 01, 2018
Feb. 27, 2018
Jan. 01, 2018
Feb. 28, 2017
Jan. 01, 2017
Jan. 31, 2018
shares
Mar. 31, 2018
USD ($)
simulation
shares
Dec. 31, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Granted (shares)               95,592  
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  
Expected Stock Price Volatility 22.00% 22.00%   22.00% 23.00% 25.00%      
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  
Unearned compensation | $               $ 44.7 $ 24.7
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 | Tranche Five                  
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 | Tranche Five                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting percentage               50.00%  
2017 Performance Grant | Market performance-based awards | Tranche Six                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting percentage               50.00%  
2018 Performance Grant | Market performance-based awards | Tranche Five                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting percentage               50.00%  
2018 Performance Grant | Market performance-based awards | Tranche Six                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vesting percentage               50.00%