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Incentive Plan (2014 and 2015 Market Performance-Based Awards) (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
simulation
shares
Dec. 31, 2014
USD ($)
Market Performance-Based Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of trials run | simulation 100,000  
Fair value of awards $ 34.3  
Expected service period 4 years  
Unearned compensation $ 17.8 $ 9.5
Compensation expense 4.1 3.0
Capitalized expense related to construction and leasing activities $ 4.1 $ 1.4
Class D Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Units granted (in shares) | shares 1,148,991  
Restricted Stock Units (RSUs)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Units granted (in shares) | shares 368,878  
2014 Performance Grant | Market Performance-Based Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance period 3 years  
Expected volatility rate 33.00%  
Risk free interest rate 0.67%  
2014 Performance Grant | Market Performance-Based Awards | Below Threshold Level (less than)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 0.00%  
Performance threshold percentage 0.00%  
2014 Performance Grant | Market Performance-Based Awards | Threshold Level    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 25.00%  
Performance threshold percentage 0.00%  
2014 Performance Grant | Market Performance-Based Awards | Target Level    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 50.00%  
Performance threshold percentage 3.25%  
2014 Performance Grant | Market Performance-Based Awards | High Level (greater than)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 100.00%  
Performance threshold percentage 6.50%  
2014 Performance Grant | Market Performance-Based Awards | Share Based Compensation Award Tranche Fifth    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 50.00%  
2014 Performance Grant | Market Performance-Based Awards | Share Based Compensation Award Tranche Six    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 50.00%  
2015 Performance Grant | Market Performance-Based Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance period 3 years  
Expected volatility rate 24.00%  
Risk free interest rate 1.00%  
2015 Performance Grant | Market Performance-Based Awards | Below Threshold Level (less than)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 0.00%  
Performance threshold percentage (3.00%)  
2015 Performance Grant | Market Performance-Based Awards | Threshold Level    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 25.00%  
Performance threshold percentage (3.00%)  
2015 Performance Grant | Market Performance-Based Awards | Target Level    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 50.00%  
Performance threshold percentage 1.00%  
2015 Performance Grant | Market Performance-Based Awards | High Level (greater than)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 100.00%  
Performance threshold percentage 5.00%  
2015 Performance Grant | Market Performance-Based Awards | Share Based Compensation Award Tranche Fifth    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 50.00%  
2015 Performance Grant | Market Performance-Based Awards | Share Based Compensation Award Tranche Six    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 50.00%