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Dividends (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 15, 2023
Jul. 01, 2023
Mar. 15, 2023
Sep. 30, 2023
Aug. 31, 2023
Jun. 30, 2023
Apr. 30, 2023
Mar. 31, 2023
Jan. 31, 2023
Oct. 31, 2022
Sep. 30, 2022
Jul. 31, 2022
Apr. 30, 2022
Mar. 31, 2022
Jan. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Cash dividends declared on common stock (in dollars per share)                               $ 0.10 $ 0.10 $ 0.30 $ 0.30
Dividends paid to common shareholders                                   $ 175.5 $ 175.5
Dividends paid to preferred shareholders                                   33.2 26.8
Series B Preferred Stock                                      
Cash dividends paid on preferred stock (in dollars per share)       $ 20.67700   $ 18.92463   $ 26.875     $ 26.875     $ 26.875          
Dividends paid to preferred shareholders       $ 10.3   $ 9.5   $ 13.4     $ 13.4     $ 13.4          
Series B Preferred Stock | London Interbank Offered Rate (LIBOR)                                      
Preferred stock, basis spread on variable rate     2.539%                                
Series B Preferred Stock | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                                      
Preferred stock, basis spread on variable rate 2.539%                                    
Preferred stock, basis spread on variable rate, tenor spread adjustment 0.26161%                                    
Quarterly dividend                                      
Cash dividends declared on common stock (in dollars per share)         $ 0.10                            
Cash dividends paid on common stock (in dollars per share)   $ 0.10         $ 0.10   $ 0.10 $ 0.10   $ 0.10 $ 0.10   $ 0.10        
Dividends paid to common shareholders   $ 58.5         $ 58.5   $ 58.5 $ 58.5   $ 58.5 $ 58.5   $ 58.5        
Common equities | Quarterly dividend                                      
Common share dividends       $ 58.5             $ 58.5         $ 58.5 $ 58.5 $ 58.5 $ 58.5