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Equity - Incentive and Share-Based Compensation (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Feb. 29, 2016
USD ($)
vesting_installment
shares
Jun. 30, 2015
USD ($)
shares
Feb. 28, 2015
USD ($)
vesting_installment
shares
Jan. 31, 2015
USD ($)
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 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 Fair Value [Roll Forward]                    
Beginning balance, Unvested, Weighted Average Grant Fair Value (in USD per share) | $ / shares               $ 11.04    
Vested, Weighted Average Grant Fair Value (in USD per share) | $ / shares               15.89    
Granted, Weighted Average Grant Fair Value (in USD per share) | $ / shares               9.58    
Forfeited, Weighted Average Grant Fair Value (in USD per share) | $ / shares               17.97    
Ending balance, Unvested, Weighted Average Grant Fair Value (in USD per share) | $ / shares $ 10.00         $ 10.00   $ 10.00   $ 11.04
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         12,200,000   12,200,000    
Number of shares that remain available for future issuance 8,300,000         8,300,000   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 | $               $ 18.4    
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 Fair Value [Roll Forward]                    
Granted, Weighted Average Grant Fair Value (in USD per share) | $ / shares               $ 9.60    
Long-Term Incentive Plan Unit                    
Restricted Stock and LTIP Unit Activity [Roll Forward]                    
Beginning balance, Unvested (in shares)               1,415,895    
Vested (in shares)               (124,843)    
Granted (in shares)               1,868,629    
Forfeited (in shares)               0    
Ending balance, Unvested (in shares) 3,159,681         3,159,681   3,159,681   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 | $ $ 0.1 $ 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)               47,071    
Forfeited (in shares)               (278)    
Ending balance, Unvested (in shares) 140,035         140,035   140,035   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 Fair Value [Roll Forward]                    
Noncash share-based compensation expense recognized | $           $ 0.1   $ 0.5 $ 0.5  
Unrecognized compensation expense | $ $ 0.6         0.6   $ 0.6    
Unrecognized compensation expense, period for recognition (in years)               2 years 3 months 18 days    
Awards that Do Not Meet Age and Service Requirements for Vesting                    
Weighted Average Grant Fair Value [Roll Forward]                    
Noncash share-based compensation expense recognized | $           2.5 $ 1.2 $ 4.2 $ 2.4  
Unrecognized compensation expense | $ 23.5         $ 23.5   $ 23.5    
Unrecognized compensation expense, period for recognition (in years)               2 years 9 months 18 days    
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               0.00    
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              
Director | 2013 Plan Units Vesting three years after June 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 | $ $ 0.8                  
Award vesting period (in years) 3 years                  
Restricted Stock and LTIP Unit Activity [Roll Forward]                    
Granted (in shares) 43,257                  
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