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Stock Based Compensation (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 15.0   15.0  
Grants in period     0.8 0.8
Risk free interest rate     2.55%  
Expected dividend rate     5.60% 5.60%
Equity based compensation, net $ 3.4 $ 2.8 $ 6.0 $ 5.3
Amount capitalized (0.2) $ (0.0) (0.4) $ (0.0)
Compensation cost not yet recognized $ 22.1   $ 22.1  
Weighted average remaining contractual term     2 years 4 months 24 days  
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period     1 year  
Expected volatility rate     20.00% 29.00%
Risk free interest rate       2.43%
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service period     5 years  
Expected volatility rate     21.00% 32.00%
Risk free interest rate       2.53%