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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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	317,944		317,944
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	$ 1.1	$ 2.2	$ 2.1
Unrecognized compensation, other than options	12.0		$ 12.0
Unrecognized compensation recognition period			2 years 9 months 18 days
Fair value inputs forfeiture rate			0.00%
Intrinsic value of restricted shares			$ 2.6	1.8
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	$ 0.5	0.3
Unrecognized compensation, other than options	0.5		$ 0.5
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	$ 1.0	0.7
Unrecognized compensation, other than options	5.6		$ 5.6
Unrecognized compensation recognition period			2 years 8 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	0.1	$ 0.1	$ 0.3	$ 0.2
Unrecognized compensation, other than options	$ 0.4		$ 0.4
Unrecognized compensation recognition period			1 year 2 months 12 days
Vesting percentage			50.00%
Performance units and shares [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years