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Stock Based Compensation (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 15.0   15.0  
Grants in period     0.7 0.8
Risk free interest rate       2.55%
Expected dividend rate       5.60%
Equity based compensation, net $ 3.5 $ 3.5 $ 8.5 $ 9.5
Amount capitalized (0.3) $ (0.2) (0.7) $ (0.6)
Compensation cost not yet recognized $ 17.1   $ 17.1  
Weighted average remaining contractual term     2 years 1 month 6 days  
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period     1 year  
Expected volatility rate     20.00% 20.00%
Risk free interest rate     1.20%  
Expected dividend rate     5.90%  
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period     5 years  
Expected volatility rate     23.00% 21.00%
Risk free interest rate     1.30%  
Expected dividend rate     6.00%