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Incentive Plan (Market Performance Based Awards) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
simulation
shares
Mar. 31, 2015
USD ($)
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 $ 55.3    
Award requisite service period 4 years    
Unearned compensation $ 36.1   $ 17.8
Recognized compensation expense 2.2 $ 1.2  
Capitalized expense related to construction and leasing activities $ 0.7 $ 0.4  
Market Performance-Based Awards | 2015 Performance Grant      
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%    
Market Performance-Based Awards | 2015 Performance Grant | Threshold Level      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Threshold (3.00%)    
Market Performance Vesting Percentage 0.00%    
Market Performance-Based Awards | 2015 Performance Grant | Target Level      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Threshold (3.00%)    
Market Performance Vesting Percentage 25.00%    
Market Performance-Based Awards | 2015 Performance Grant | High Level      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Threshold 1.00%    
Market Performance Vesting Percentage 50.00%    
Market Performance-Based Awards | 2015 Performance Grant | Tranche Four      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Threshold 5.00%    
Market Performance Vesting Percentage 100.00%    
Market Performance-Based Awards | 2016 Performance Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 3 years    
Market Performance-Based Awards | 2016 Performance Grant | Threshold Level      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Threshold (3.00%)    
Market Performance Vesting Percentage 0.00%    
Market Performance-Based Awards | 2016 Performance Grant | Target Level      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Threshold (3.00%)    
Market Performance Vesting Percentage 25.00%    
Market Performance-Based Awards | 2016 Performance Grant | High Level      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Threshold 1.00%    
Market Performance Vesting Percentage 50.00%    
Market Performance-Based Awards | 2016 Performance Grant | Tranche Four      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance Threshold 5.00%    
Market Performance Vesting Percentage 100.00%    
Market Performance-Based Awards | 2016 Performance Grant | Tranche Fifth      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Market Performance Vesting Percentage 50.00%    
Market Performance-Based Awards | 2016 Performance Grant | Tranche Six      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Market Performance Vesting Percentage 50.00%    
Market Performance-Based Awards | Minimum | 2016 Performance Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility rate 22.00%    
Risk-free interest rate 1.32%    
Market Performance-Based Awards | Maximum | 2016 Performance Grant      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility rate 26.00%    
Risk-free interest rate 0.89%    
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 457,333