Annual report pursuant to Section 13 and 15(d)

Capital Stock - ATM Agreements (Details)

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Capital Stock - ATM Agreements (Details) - USD ($)
$ in Millions
 17 Months Ended 48 Months Ended
Aug. 05, 2021
Apr. 09, 2021
Dec. 18, 2018
Dec. 31, 2022
Dec. 31, 2022
Mar. 10, 2021
Series B Depositary Shares            
Sale of stock            
Shares issued (in shares)   1,600,000        
Depositary share's fractional interest in share of preferred stock   0.001        
2018 Common Stock ATM Agreement            
Sale of stock            
Maximum amount of common shares to be issued     $ 30.0     $ 50.0
2018 Common Stock ATM Agreement | Maximum            
Sale of stock            
Sales commission paid per transaction (as a percent)     3.00%      
2021 ATM Agreement            
Sale of stock            
Maximum amount of shares to be issued $ 50.0          
2021 ATM Agreement | Series B Depositary Shares            
Sale of stock            
Shares issued (in shares)       0    
2021 ATM Agreement | Maximum            
Sale of stock            
Sales commission paid per transaction, preferred stock (as a percent) 3.00%          
Common Stock | 2018 Common Stock ATM Agreement            
Sale of stock            
Shares issued (in shares)         0