Stock-Based Compensation (Stock-Based Compensation Costs) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Stock or Unit Option Plan Expense	$ 0.1	$ 0.1	$ 0.1
Stock Appreciation Rights Expense	0.9	11.6	6.6
Allocated Share-based Compensation Expense	1.9	12.2	7.1
Share-based Payment Arrangement, Expense, Tax Benefit	(0.2)	(1.5)	0.0
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Restricted Stock or Unit Expense	0.7	0.5	0.4
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock or Unit Expense	0.7	0.5	0.4
Restricted Stock
Share-Based Payment Arrangement, Noncash Expense [Abstract]
Restricted Stock or Unit Expense	0.2	0.0	0.0
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock or Unit Expense	$ 0.2	$ 0.0	$ 0.0

Stock Appreciation Rights Expense

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

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- Definition

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

+ Details

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- Definition

Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

+ Details

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- References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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- Definition

Amount of noncash expense for option under share-based payment arrangement.

+ References

+ Details

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- Details

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- Details

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