Fair value of assets held under trust.

No definition available.

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Period Type:	instant

- Definition

Amount of transfers of liabilities measured on a recurring basis between levels of the fair value hierarchy.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

+ Details

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- References

No definition available.

+ Details

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Balance Type:	na
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-3

+ Details

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Balance Type:	na
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- Definition

Fair value of obligations measured on a recurring basis.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of financial and nonfinancial obligations.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

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Fair Value of Assets and Liabilities - Fair Value Measurements (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Transfers Between Levels Amount	$ 0	$ 0
Fair value liabilities measured on recurring basis
Long-Term Debt, Fair Value	1,441		$ 1,819.7
Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Total	20,800,000		29,000,000.0
Fair value liabilities measured on recurring basis
Total	4,200,000		4,400,000
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Total	20,800,000		29,000,000.0
Fair value liabilities measured on recurring basis
Total	4,200,000		4,400,000
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Total	0		0
Fair value liabilities measured on recurring basis
Total	0		0
Assets held in rabbi trusts [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	4,200,000		4,400,000
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	16,600,000		24,600,000
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	16,600,000		24,600,000
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	0		0
Securities and other investments \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	4,200,000		4,400,000
Securities and other investments \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	4,200,000		4,400,000
Securities and other investments \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	0		0
Other liabilities \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Deferred compensation	4,200,000		4,400,000
Other liabilities \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value liabilities measured on recurring basis
Deferred compensation	4,200,000		4,400,000
Other liabilities \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Deferred compensation	$ 0		$ 0