Share-based Compensation Arrangement, Target Award, Percentage

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Share-based Compensation, Percentage of Target Award Which Participant May Earn

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Share-Based Payment Arrangement, Share Adjustment, Total Margin Improvement Relative To Peer Group, Percentage

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

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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

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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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Number, after shares used to satisfy grantee's tax withholding obligation for award under share-based payment arrangement, of restricted shares issued. Excludes cash used to satisfy grantee's tax withholding obligation.

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- Definition

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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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No definition available.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Stock Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Apr. 27, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)		150,000,000		150,000,000		150,000,000
Total stock compensation expense		$ 10.2	$ 7.8	$ 37.5	$ 25.4
Performance Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		808,032		808,032
Weighted-average grant price for awards outstanding (in dollars per share)		$ 128.89		$ 128.89
Share-based compensation cost not yet recognized		$ 48.5		$ 48.5
Share-based compensation cost not yet recognized, period for recognition				2 years
Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		215,671		215,671
Weighted-average grant price for awards outstanding (in dollars per share)		$ 122.52		$ 122.52
Share-based compensation cost not yet recognized		$ 18.8		$ 18.8
Share-based compensation cost not yet recognized, period for recognition				1 year 6 months
Shares awarded after shares with held for taxes (in shares)				16,191
Shares withheld for Taxes (in shares)				11,277
Share adjustment percentage based on a total margin improvement metric relative the defined peer group				25.00%
Stock-Settled Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation cost not yet recognized		$ 0.1		$ 0.1
Outstanding awards (in shares)		98,259		98,259
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares awarded after shares with held for taxes (in shares)	10,524
Shares awarded (in shares)	12,069
Total stock compensation expense				$ 1.5
2006 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares)		10,000,000		10,000,000
Shares available for grant (in shares)		3,581,555		3,581,555
Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target award percentage				100.00%
Long-Term Incentive Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target award				200.00%