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Incentive Plan (Market Performance Based Awards) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
simulation
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
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     $ 55.4    
Award requisite service period     4 years    
Unearned compensation $ 28.8   $ 28.8   $ 17.8
Recognized compensation expense 1.9 $ 2.1 5.9 $ 5.4  
Capitalized expense related to construction and leasing activities $ 0.5 $ 2.5 $ 1.4 $ 3.6  
Class D Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (shares) | shares     1,683,182    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (shares) | shares     459,569    
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          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance threshold     (3.00%)    
Market Performance Vesting Percentage     0.00%    
2015 Performance Grant | Market Performance-Based Awards | Threshold Level          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance threshold     (3.00%)    
Market Performance Vesting Percentage     25.00%    
2015 Performance Grant | Market Performance-Based Awards | Target Level          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance threshold     1.00%    
Market Performance Vesting Percentage     50.00%    
2015 Performance Grant | Market Performance-Based Awards | High Level          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance threshold     5.00%    
Market Performance Vesting Percentage     100.00%    
2015 Performance Grant | Market Performance-Based Awards | Tranche Five          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Market Performance Vesting Percentage     50.00%    
2015 Performance Grant | Market Performance-Based Awards | Tranche Six          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Market Performance 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    
2016 Performance Grant | Market Performance-Based Awards | Below Threshold Level          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance threshold       (3.00%)  
Market Performance Vesting Percentage       0.00%  
2016 Performance Grant | Market Performance-Based Awards | Threshold Level          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance threshold       (3.00%)  
Market Performance Vesting Percentage       25.00%  
2016 Performance Grant | Market Performance-Based Awards | Target Level          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance threshold       1.00%  
Market Performance Vesting Percentage       50.00%  
2016 Performance Grant | Market Performance-Based Awards | High Level          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance threshold       5.00%  
Market Performance Vesting Percentage       100.00%  
2016 Performance Grant | Market Performance-Based Awards | Tranche Five          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Market Performance Vesting Percentage     50.00%    
2016 Performance Grant | Market Performance-Based Awards | Tranche Six          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Market Performance 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%