Share-Based Compensation Arrangement by Share-Based Payment Award, Award Performance Period

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- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Maximum Payout Period Following end of Performance Period

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- Definition

Share-based Compensation Arrangement By Share-based Payment Award, Maximum Payout Period Following end of Vesting Period

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- Definition

Share-Based Payment Arrangement, Expense, Net of Tax

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- Definition

Share-Based Payment Arrangement, Expense to be Recognized In Next Twelve Months

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- Definition

Share-Based Payment Arrangement, Expense to be Recognized In Year Two

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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- Definition

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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- Definition

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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Number of shares authorized for issuance under share-based payment arrangement.

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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Independent Directors \| Share-Based Payment Arrangement, Nonemployee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1.1	$ 1.1	$ 0.8
Phantom Share Units (PSUs) \| Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	7.8	8.6	6.6
Compensation expense, net of tax	5.5	6.0	4.6
Compensation cost not yet recognized	$ 12.3
Cost not yet recognized, period for recognition	2 years
Annual Performance Period Awards (APP) \| Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash payment to settle award	$ 3.9	4.5	3.1
Annual Performance Period Awards (APP) \| Former CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash payment to settle award	$ 0.9
Multi-Year Performance Plan Awards (MPP)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	1,631,328
Multi-Year Performance Plan Awards (MPP) \| Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance period	3 years
Maximum payout period following end of performance period	90 days
Compensation expense	$ 5.1	3.9	3.7
Compensation expense, net of tax	4.3	2.7	2.6
Share-based compensation expense to be recognized in 2024	1.6
Share-based compensation expense to be recognized in 2025	0.5
Restricted Stock Units (RSUs) \| Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	4.2	1.5	0.6
Compensation expense, net of tax		$ 1.0	$ 0.4
Share-based compensation expense to be recognized in 2024	1.8
Share-based compensation expense to be recognized in 2025	$ 1.5
Maximum payout period following end of vesting period	90 days
Restricted Stock Units (RSUs) \| Former CEO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense, net of tax	$ 3.5
Share-based payment, accelerated cost	1.7
Restricted Stock Units (RSUs) with Performance Conditions \| Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	0.9
Compensation expense, net of tax	0.8
Share-based compensation expense to be recognized in 2024	$ 2.1
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum \| Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Minimum \| Phantom Share Units (PSUs) \| Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Maximum \| Phantom Share Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Maximum \| Phantom Share Units (PSUs) \| Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years