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COMMITMENTS - Forward Purchase Agreement (Details) - USD ($)		9 Months Ended	12 Months Ended
	Jun. 05, 2020	Sep. 30, 2021	Dec. 31, 2020	Jun. 19, 2020
Commitments And Contingencies [Line Items]
Number of shares per warrant				1
Exercise price of warrant		$ 11.50
Class A ordinary shares
Commitments And Contingencies [Line Items]
Gross proceeds		$ 517,500,000	$ 517,500,000
Cannae Holdings Inc | Warrants
Commitments And Contingencies [Line Items]
Number of shares per warrant	1
Exercise price of warrant	$ 11.50
Warrants to be purchased pursuant to agreements	2,500,000
Cannae Holdings Inc | Class A ordinary shares
Commitments And Contingencies [Line Items]
Gross proceeds	$ 75,000,000	$ 200,000,000
Share price per share	$ 10.00
Percentage of issued and outstanding shares held by initial stockholders	20.00%
Shares to be purchased pursuant to agreements	7,500,000

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Exercise price per share or per unit of warrants or rights outstanding.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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