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Employee Share-Based Incentive Compensation Plans - Restricted Shares (Details) - Restricted Stock - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Restricted Shares      
Beginning of period (in shares) 38,350 37,850 43,105
Issued (in shares) 10,895 13,225 13,475
Vested (in shares) (11,650) (12,725) (17,936)
Forfeited (in shares) 0 0 (794)
End of period (in shares) 37,595 38,350 37,850
Accrued Expense      
Beginning of period $ 15.5 $ 15.9 $ 15.2
Issued 16.0 13.8 16.1
Vested 0.0 0.0 0.0
Forfeited 0.0 0.0 (0.8)
Expense recognized (15.3) (14.2) (14.6)
End of period $ 16.2 $ 15.5 $ 15.9