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Equity - Incentive and Share-based Compensation (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
shares
Feb. 28, 2015
USD ($)
tranche
vesting_installment
shares
Jan. 31, 2015
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
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, per share | $ / shares     $ 13.78     $ 13.78  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value | $ / shares           15.00  
Granted, Weighted Average Grant Price, per share | $ / shares           18.11  
Forfeited, Weighted Average Grant Price, per share | $ / shares           16.11  
Ending balance, Unvested, Weighted Average Grant Price, per share | $ / shares       $ 14.96   $ 14.96  
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       12,200,000.0   12,200,000.0  
Number of shares that remain available for future issuance       10,200,000.0   10,200,000.0  
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 | $           $ 6.6  
Dividend rate           1.90%  
Risk-free interest rate           0.80%  
Expected price volatility           24.00%  
Weighted Average Grant Price [Roll Forward]              
Granted, Weighted Average Grant Price, per share | $ / shares           $ 13.36  
Long-Term Incentive Plan Unit              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected term           3 years  
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Beginning balance, Unvested (in shares)     1,194,660     1,194,660  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period           (59,875)  
Granted (in shares)           461,180  
Forfeited (in shares)           (5,544)  
Ending balance, Unvested (in shares)       1,590,421   1,590,421  
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)   4 years          
Number of vesting installments (tranche) | tranche   3          
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)   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 | $   $ 0.4          
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)   33,398          
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Expected term           2 years 10 months 24 days  
Risk-free interest rate           1.00%  
Expected price volatility           29.00%  
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Beginning balance, Unvested (in shares)     102,296     102,296  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period           (7,405)  
Granted (in shares)           30,020  
Forfeited (in shares)           (8,977)  
Ending balance, Unvested (in shares)       115,934   115,934  
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)   14,315          
Awards that Meet Age and Service Requirements for Vesting              
Weighted Average Grant Price [Roll Forward]              
Noncash share-based compensation expense recognized | $           $ 0.5 $ 0.3
Unrecognized compensation expense | $       $ 0.2   $ 0.2  
Unrecognized compensation expense, period for recognition (in years)           1 year 4 months 24 days  
Awards that Do Not Meet Age and Service Requirements for Vesting              
Weighted Average Grant Price [Roll Forward]              
Noncash share-based compensation expense recognized | $       1.4 $ 0.9 $ 3.8 $ 2.8
Unrecognized compensation expense | $       $ 11.6   $ 11.6  
Unrecognized compensation expense, period for recognition (in years)           2 years 6 months  
Director              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Forfeiture rate, percent           0  
Director | 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 | 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 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 | $   $ 2.9          
Award vesting period (in years)   4 years          
Number of vesting installments (tranche) | tranche   3          
Restricted Stock and LTIP Unit Activity [Roll Forward]              
Granted (in shares)   168,033          
Executive Officer | 2013 Plan Units Vesting January 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 | $   $ 1.3          
Award vesting period (in years)   3 years          
Number of vesting installments (tranche) | tranche   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) | $   0.0          
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