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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2020
shares
Jan. 31, 2020
USD ($)
installment
$ / shares
shares
Jun. 30, 2020
USD ($)
compensation_plan
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
compensation_plan
Jun. 30, 2019
USD ($)
Jul. 30, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of share-based incentive compensation plans | compensation_plan     1   1    
Share-based compensation expense | $     $ 13.6 $ 8.7 $ 22.2 $ 17.5  
Share-based compensation expense capitalized | $     2.0 $ 1.9 3.9 $ 3.5  
Share-based compensation not yet recognized | $     $ 52.1   $ 52.1    
Share-based compensation not yet recognized period of recognition         1 year 10 months 24 days    
Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted in period (in shares) | shares   263,626          
Market Measure-Based Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted in period (in shares) | shares   154,267          
Time-Based Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted in period (in shares) | shares   109,359          
Time-Based RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period   3 years          
Number of installments | installment   3          
Right to receive number of shares (in shares) | shares   1          
Time-Based Restricted Stock Units (RSUs), Grant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Fair value RSUs granted | $   $ 9.0          
Performance-Based RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period         3 years    
Vesting, achievement of pre-set FFO per share goals, percentage of RSUs     100.00%   100.00%    
Vesting, Average debt to EBIDTA ratio, percentage of RSUs     50.00%   50.00%    
Vesting, Market measure, percentage of RSUs     50.00%   50.00%    
Number of shares issuable per RSU   1          
Share price | $ / shares   $ 82.57          
Fair value per share on valuation date (in dollars per share) | $ / shares   $ 84.54          
Remaining expected life, including future volatility   5 years 9 months 18 days          
Performance period   2 years 10 months 24 days          
Fair value RSUs granted | $   $ 12.9          
Share-based compensation expense | $         $ 2.0    
Accelerated Compensation Related to Severance Packages [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense | $     $ 4.1   4.3    
General and Administrative Expense [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Cash severance costs for departure of an executive officer | $     $ 14.1   $ 14.1    
Subsequent event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Effective registration shares (in shares) | shares             10,700,000
Number of shares available for grant (in shares) | shares             1,600,000
Subsequent event [Member] | Time-Based Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of RSUs forfeited (in shares) | shares 1,514            
Subsequent event [Member] | Performance-Based RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of RSUs forfeited (in shares) | shares 12,263