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Incentive Plan (Market Performance Based Awards) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
simulation
shares
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (shares) 55,324    
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    
Fair value of awards | $ $ 74.9    
Award requisite service period 4 years    
Unearned compensation | $ $ 41.1   $ 25.6
Recognized compensation expense | $ 2.1 $ 2.2  
Capitalized expense related to construction and leasing activities | $ $ 0.7 $ 0.7  
Market Performance-Based Awards | Below Threshold Level      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance threshold (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 (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 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 5.00%    
Vesting percentage 100.00%    
Class D Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (shares) 2,029,908    
Vested (shares) 490,529    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (shares) 543,923    
Vested (shares) 104,313    
2016 Performance Grant | Market Performance-Based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 3 years    
2016 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 | Tranche Six      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 50.00%    
2016 Performance Grant | Market Performance-Based Awards | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility rate 22.00%    
Risk-free interest rate 1.32%    
2016 Performance Grant | Market Performance-Based Awards | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility rate 26.00%    
Risk-free interest rate 0.89%    
2017 Performance Grant | Market Performance-Based Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 3 years    
Expected volatility rate 25.00%    
Risk-free interest rate 1.49%    
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%