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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Equity Incentive Plan (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	May 31, 2020
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of Common stock					700,000
Future issuances	169,809
Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized share based compensation	$ 4.6	$ 3.9	$ 3.5
Unrecognized compensation, other than options	$ 9.6
Unrecognized compensation recognition period	2 years 4 months 24 days
Fair value inputs forfeiture rate	0.00%
Intrinsic value of restricted shares	$ 2.7	$ 1.9	$ 1.8
Shares Outstanding, granted	82,000	81,000	87,000
Fair value of shares granted to directors	$ 73.15	$ 63.10	$ 65.23
Restricted Shares \| Prior To 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Restricted Shares \| During 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Restricted Shares \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Recognized share based compensation	$ 1.1	$ 0.7
Fair value inputs forfeiture rate	0.00%
Shares Outstanding, granted	14,535	10,636
Fair value of shares granted to directors	$ 73.27	$ 62.62
Performance units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years	3 years
Shares Outstanding, granted	47,000	34,000
Fair value of shares granted to directors	$ 80.34	$ 68.59
Performance units and shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years	3 years	3 years	3 years
Fair value inputs forfeiture rate	0.00%
Amortization period of compensation expense	5 years
Shares Outstanding, granted	33,000	28,000	43,000
Fair value of shares granted to directors	$ 90.17	$ 66.96	$ 63.42
Performance units and shares [Member] \| Prior To 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance units and shares [Member] \| During 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance units and shares [Member] \| 3 Year Performance period to be completed
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Recognized share based compensation	$ 2.2	$ 1.5	$ 1.2
Unrecognized compensation, other than options	$ 4.4
Unrecognized compensation recognition period	2 years 2 months 12 days
Vesting percentage	50.00%
Performance units and shares [Member] \| 3 Year Performance period completed
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Recognized share based compensation	$ 0.5	$ 0.4	$ 0.2
Unrecognized compensation, other than options	$ 0.2
Unrecognized compensation recognition period	10 months 24 days
Vesting percentage	50.00%
Performance units and shares [Member] \| Maximum \| Prior To 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years