Accounts receivable credits reclassified to cancelled event liabilities.

No definition available.

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- Definition

Cancelled event liabilities.

+ References

No definition available.

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- Definition

Contract with customer liability revenue recognized during period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Contracts with customers commission benefitted expected period.

+ References

No definition available.

+ Details

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- Definition

Contracts with customers sales beginning period.

+ References

No definition available.

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- Definition

Revenue from contract with customer.

+ References

No definition available.

+ Details

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- Definition

Revenue from contract with customer payment terms with commerce revenues.

+ References

No definition available.

+ Details

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

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
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+ Details

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

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

+ References

+ Details

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

- Definition

Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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-Subparagraph (b)
-Publisher FASB
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Revenues - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Revenue From Contract With Customer [Line Items]
Current deferred revenues	$ 199.9		$ 199.9		$ 190.5
Revenue recognized			147.8
Cancelled event liabilities	1.1		1.1		1.2
Provision for expected credit losses	0.6		0.9	$ 0.4
Accounts receivable write off	0.4		$ 0.4
Maximum [Member]
Revenue From Contract With Customer [Line Items]
Contracts with customers sales beginning period			1 year
Contracts with customers commission benefited expected period			1 year
Payment term			60 days
Minimum [Member]
Revenue From Contract With Customer [Line Items]
Payment term			30 days
Other Noncurrent Liabilities [Member]
Revenue From Contract With Customer [Line Items]
Long-term deferred revenues	$ 0.8		$ 0.8
Trade Show and Other Events [Member] \| Sales Revenue, Net [Member] \| Customer Concentration Risk [Member]
Revenue From Contract With Customer [Line Items]
Concentration risk, percentage	90.40%	87.20%	92.30%	90.40%
Trade Shows [Member] \| COVID-19 [Member]
Revenue From Contract With Customer [Line Items]
Current deferred revenues	$ 0.8		$ 0.8
Accounts receivable credits reclassified to cancelled event liabilities	$ 0.3		$ 0.3		$ 1.1