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Equity - Incentive and Share-Based Compensation (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 29, 2016
USD ($)
vesting_installment
shares
Jun. 30, 2015
USD ($)
shares
Feb. 28, 2015
USD ($)
vesting_installment
shares
Jan. 31, 2015
USD ($)
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $             $ 0.1
Expected volatility rate look-back period (in years)         6 years    
Forfeiture rate, percent         0.05    
Weighted Average Grant Price [Roll Forward]              
Beginning balance, Unvested, Weighted Average Grant Price (in USD per share) | $ / shares         $ 15.20    
Vested, Weighted Average Grant Price (in USD per share) | $ / shares         16.52    
Granted, Weighted Average Grant Price (in USD per share) | $ / shares         15.92    
Forfeited, Weighted Average Grant Price (in USD per share) | $ / shares         0.00    
Ending balance, Unvested, Weighted Average Grant Price (in USD per share) | $ / shares         $ 15.57   $ 15.20
Age of grantee at which LTIP unit and restricted stock awards immediately vest         60 years    
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest         10 years    
2013 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized under the plan         12,200,000    
Number of shares that remain available for future issuance         8,300,000    
Long-Term Incentive Plan Unit and Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $         $ 17.5    
Expected term         2 years 9 months 18 days    
Dividend rate         2.10%    
Risk-free interest rate         0.84%    
Expected price volatility         24.00%    
Weighted Average Grant Price [Roll Forward]              
Granted, Weighted Average Grant Price (in USD per share) | $ / shares         $ 9.38    
Long-Term Incentive Plan Unit              
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Beginning balance, Unvested (in shares)         1,415,895    
Vested (in shares)         (100,595)    
Granted (in shares)         1,821,360    
Forfeited (in shares)         0    
Ending balance, Unvested (in shares)         3,136,660   1,415,895
Time Based Long-Tern Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $ $ 1.4   $ 0.8        
Award vesting period (in years) 4 years   4 years        
Number of vesting installments (tranche) | vesting_installment 3   3        
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares) 47,168   33,398        
Performance Based Long-Term Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $ $ 0.8   $ 0.4        
Award vesting period (in years) 3 years   3 years        
Number of vesting installments (tranche) | vesting_installment 2   2        
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares) 112,925   33,398        
Restricted Stock              
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Beginning balance, Unvested (in shares)         97,592    
Vested (in shares)         (4,350)    
Granted (in shares)         44,198    
Forfeited (in shares)         0    
Ending balance, Unvested (in shares)         137,440   97,592
Performance Restricted Shares              
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)     14,315        
Time Restricted Shares              
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares) 44,198   14,315        
Awards that Meet Age and Service Requirements for Vesting              
Weighted Average Grant Price [Roll Forward]              
Noncash share-based compensation expense recognized | $         $ 0.4 $ 0.5  
Unrecognized compensation expense | $         $ 0.7    
Unrecognized compensation expense, period for recognition (in years)         2 years 6 months    
Awards that Do Not Meet Age and Service Requirements for Vesting              
Weighted Average Grant Price [Roll Forward]              
Noncash share-based compensation expense recognized | $         $ 1.7 $ 1.2  
Unrecognized compensation expense | $         $ 25.1    
Unrecognized compensation expense, period for recognition (in years)         3 years    
Employee | Time Based Long-Tern Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $       $ 0.2      
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)       9,531      
Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Forfeiture rate, percent         0    
Director | 2013 Plan Units Vesting February 2015 | Time Based Long-Tern Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $   $ 0.6          
Award vesting period (in years)   3 years          
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)   35,082          
Executive Officer              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Forfeiture rate, percent         0    
Executive Officer | 2013 Plan Units Vesting January 2018 | Time Based Long-Tern Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $     $ 2.9        
Award vesting period (in years)     4 years        
Number of vesting installments (tranche) | vesting_installment     3        
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)     168,033        
Executive Officer | 2013 Plan Units Vesting January 2018 | Performance Based Long-Term Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $     $ 1.3        
Award vesting period (in years)     3 years        
Number of vesting installments (tranche) | vesting_installment     2        
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)     154,266        
Executive Officer | 2013 Plan Units Vesting February 2015 | Time Based Long-Tern Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $     $ 0.2        
Award vesting period (in years)     4 years        
Number of vesting installments (tranche) | vesting_installment     3        
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)     13,736        
Executive Officer | 2013 Plan Units Vesting February 2015 | Performance Based Long-Term Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $     $ 0.1        
Award vesting period (in years)     3 years        
Number of vesting installments (tranche) | vesting_installment     2        
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)     13,736        
Executive Officer | 2013 Plan Units Vesting January 2016 | Time Based Long-Tern Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $ $ 5.6            
Award vesting period (in years) 4 years            
Number of vesting installments (tranche) | vesting_installment 3            
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares) 368,225            
Executive Officer | 2013 Plan Units Vesting January 2016 | Performance Based Long-Term Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $ $ 8.8            
Award vesting period (in years) 3 years            
Number of vesting installments (tranche) | vesting_installment 2            
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares) 1,230,228            
Executive Officer | 2013 Plan Units Vesting three years after February 2016 | Time Based Long-Tern Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value of share-based awards granted in period | $ $ 1.0            
Award vesting percentage after three years         30.00%    
Award vesting percentage after four years         30.00%    
Award vesting percentage after five years         40.00%    
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares) 62,814