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Employee Share-Based Incentive Compensation Plans - Restricted Shares (Details) - Restricted Stock - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restricted Shares        
Beginning of period (in shares) 35,525 37,595 37,595 38,350
Issued (in shares) 0 0 11,405 10,895
Vested (in shares) 0 0 (13,475) (11,650)
Forfeited (in shares) (135) 0 (135) 0
End of period (in shares) 35,390 37,595 35,390 37,595
Unamortized Issue Date Fair Value        
Beginning of period $ 28.8 $ 24.3 $ 16.2 $ 15.5
Issued 0.0 0.0 20.0 16.0
Vested 0.0 0.0 0.0 0.0
Forfeited 0.0 0.0 0.0 0.0
Expense recognized (4.5) (4.1) (11.9) (11.3)
End of period $ 24.3 $ 20.2 $ 24.3 $ 20.2