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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	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	317,970		317,970
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years		5 years
Recognized share based compensation	$ 1.2	$ 0.9	$ 3.4	$ 3.0
Unrecognized compensation, other than options	10.8		$ 10.8
Unrecognized compensation recognition period			2 years 7 months 6 days
Fair value inputs forfeiture rate			0.00%
Intrinsic value of restricted shares			$ 2.7	1.9
Shares Outstanding, granted			82,000
Fair value of shares granted to directors			$ 73.21
Restricted Shares [Member] \| Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Recognized share based compensation	0.3	0.2	$ 0.8	0.5
Unrecognized compensation, other than options	0.3		$ 0.3
Fair value inputs forfeiture rate			0.00%
Shares Outstanding, granted			14,535
Fair value of shares granted to directors			$ 73.27
Performance units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years		3 years	3 years
Shares Outstanding, granted			47,000
Fair value of shares granted to directors			$ 80.34
Performance units and shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years		3 years
Fair value inputs forfeiture rate			0.00%
Amortization period of compensation expense			5 years
Shares Outstanding, granted			33,000
Fair value of shares granted to directors			$ 90.17
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	0.6	0.4	$ 1.6	1.1
Unrecognized compensation, other than options	5.0		$ 5.0
Unrecognized compensation recognition period			2 years 6 months
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	0.1	$ 0.1	$ 0.4	$ 0.3
Unrecognized compensation, other than options	$ 0.3		$ 0.3
Unrecognized compensation recognition period			1 year
Vesting percentage			50.00%
Performance units and shares [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years