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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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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- Definition

Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement.

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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 29, 2024 $ / shares shares	Jun. 30, 2024 USD ($) plan shares	Jun. 30, 2024 USD ($) plan $ / shares shares	Jun. 30, 2023 $ / shares shares	Dec. 31, 2023 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive plans \| plan		2	2
Options granted (in shares) \| shares				385,500
Weighted average fair value of options granted (in US dollars per share) \| $ / shares			$ 7.36	$ 10.56
Aggregate intrinsic value of stock options outstanding		$ 16.5	$ 16.5		$ 12.8
Unrecognized compensation cost		$ 2.9	$ 2.9
2019 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted (in shares) \| shares			431,000
Restricted stock expense \| Executive Officer \| 2019 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (in shares) \| shares	15,000
Shares issued in period (in dollars per shares) \| $ / shares	$ 57.76
Stock option plan, award vesting period	5 years
Restricted stock vested shares (in shares) \| shares		3,970
Restricted stock non-vested shares (in shares) \| shares		31,800	31,800
Restricted stock expense \| Executive Officer \| 2019 Stock Incentive Plan \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	20.00%
Restricted stock expense \| Executive Officer \| 2019 Stock Incentive Plan \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	20.00%
Restricted stock expense \| Executive Officer \| 2019 Stock Incentive Plan \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	20.00%
Restricted stock expense \| Executive Officer \| 2019 Stock Incentive Plan \| Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	20.00%
Restricted stock expense \| Executive Officer \| 2019 Stock Incentive Plan \| Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights, percentage	20.00%
Expected To Be Recognized Remainder Of 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 1.3	$ 1.3
Expected To Be Recognized During 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		1.1	1.1
Expected To Be Recognized During 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		0.3	0.3
Expected To Be Recognized During 2026
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		0.1	0.1
Expected To Be Recognized During Thereafter
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 0.1	$ 0.1