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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
Jun. 30, 2020
USD ($)
shares
May 31, 2020
USD ($)
vesting_installment
shares
Mar. 31, 2020
USD ($)
vesting_installment
shares
Mar. 31, 2019
USD ($)
vesting_installment
shares
Jun. 30, 2020
USD ($)
shares
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Oct. 31, 2019
USD ($)
vesting_installment
shares
Jun. 30, 2019
USD ($)
May 16, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Expected volatility rate look-back period (in years)             6 years      
Weighted-average per unit or share fair value (in USD per share) | $ / shares             $ 5.43      
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest (in years)             10 years      
2019 Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized under the plan (in shares) 11,000,000.0       11,000,000.0   11,000,000.0     11,000,000.0
Number of shares that remain available for future issuance (in shares) 7,200,000       7,200,000   7,200,000      
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 | $             $ 28.1      
Weighted-average per unit or share fair value (in USD per share) | $ / shares             $ 5.43      
Dividend rate (as a percent)             3.70%      
Risk-free interest rate, minimum (as a percent)             0.16%      
Risk free interest rate, maximum (as a percent)             0.50%      
Expected price volatility, minimum (as a percent)             19.00%      
Expected price volatility, maximum (as a percent)             26.00%      
Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Threshold of continuous service for retirement eligibility (in years)             10 years      
2019 Plan Units | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)   63,229 113,971              
Fair value of share-based awards granted in period | $   $ 0.4 $ 2.3              
Award vesting period (in years)   3 years 4 years              
Number of vesting installments | vesting_installment     3              
2019 Plan Units | Market Based Long-Term Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)     502,475              
Fair value of share-based awards granted in period | $     $ 2.3              
Award vesting period (in years)   3 years 3 years              
Number of vesting installments | vesting_installment   2 2              
2019 Plan Units | Time Restricted Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)     158,806              
2013 Plan Units | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)       61,432            
Fair value of share-based awards granted in period | $       $ 2.0            
Award vesting period (in years)       4 years            
Number of vesting installments | vesting_installment       3            
2013 Plan Units | Market Based Long-Term Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)       113,383            
Fair value of share-based awards granted in period | $       $ 0.9            
Award vesting period (in years)       3 years            
Number of vesting installments | vesting_installment       2            
2013 Plan Units | Time Restricted Shares                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)       69,358            
Awards that Meet Age and Service Requirements for Vesting                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Noncash share-based compensation expense recognized | $         $ 0.3 $ 0.2 $ 1.9   $ 1.5  
Unrecognized compensation expense | $ $ 1.9       1.9   $ 1.9      
Unrecognized compensation expense, period for recognition             2 years 6 months      
Awards that Do Not Meet Age and Service Requirements for Vesting                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Noncash share-based compensation expense recognized | $         8.5 $ 6.1 $ 12.8   $ 10.2  
Unrecognized compensation expense | $ $ 37.0       $ 37.0   $ 37.0      
Unrecognized compensation expense, period for recognition             2 years 10 months 24 days      
Executive Officer | 2019 Plan Units | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)   82,199 745,155              
Fair value of share-based awards granted in period | $   $ 0.5 $ 5.6              
Executive Officer | 2019 Plan Units | Market Based Long-Term Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)   116,927 3,358,767              
Fair value of share-based awards granted in period | $   $ 0.5 $ 14.0              
Reduction of grants (in shares) 666,933                  
Fair value of reduction of share-based awards granted in period | $ $ 2.8                  
Executive Officer | 2019 Plan Units, connected with bonus program | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)     624,380              
Fair value of share-based awards granted in period | $     $ 4.4              
Award vesting period (in years)             3 years      
Vesting percentage of award face amount 125.00%       125.00%   125.00%      
Executive Officer | 2013 Plan Units | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)       461,693            
Fair value of share-based awards granted in period | $       $ 6.4            
Executive Officer | 2013 Plan Units | Market Based Long-Term Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)       1,806,520            
Fair value of share-based awards granted in period | $       $ 12.8            
Executive Officer | 2013 Plan Units, connected with bonus program | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)       334,952            
Fair value of share-based awards granted in period | $       $ 4.6            
Award vesting period (in years)             3 years      
Vesting percentage of award face amount 125.00%       125.00%   125.00%      
Executive Officer | Vest immediately | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)     23,049 26,056            
Executive Officer | Vest ratably over three years | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)     601,331 308,896            
Award vesting period (in years)     3 years 3 years            
Executive Officer | Vest in two equal annual installments | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of vesting installments | vesting_installment     2 2            
Director | 2019 Plan Units | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Granted (in shares)   171,153           76,718    
Fair value of share-based awards granted in period | $   $ 1.1           $ 1.1    
Award vesting period (in years)               3 years    
Number of vesting installments | vesting_installment               2    
Certain Other Employees | 2019 Plan Units | Market Based Long-Term Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Reduction of grants (in shares) 99,630                  
Fair value of reduction of share-based awards granted in period | $ $ 0.5                  
Minimum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Age of grantee at which LTIP unit and restricted stock awards immediately vest             60 years      
Minimum | Long-Term Incentive Plan Unit and Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Expected term (in years)             2 years      
Minimum | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period (in years)             3 years      
Minimum | 2019 Plan Units | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period (in years)   3 years                
Number of vesting installments | vesting_installment   2                
Maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Age of grantee at which LTIP unit and restricted stock awards immediately vest             65 years      
Maximum | Long-Term Incentive Plan Unit and Restricted Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Expected term (in years)             5 years 6 months      
Maximum | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period (in years)             4 years      
Maximum | 2019 Plan Units | Time Based Long-Tern Incentive Plan Unit                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period (in years)   4 years                
Number of vesting installments | vesting_installment   3