COMMITMENTS AND CONTINGENCIES - Forward Purchase Agreement (Details) - USD ($)	1 Months Ended
	May 31, 2020	Sep. 30, 2020
Commitments And Contingencies [Line Items]
Number of shares per warrant		1
Exercise price of warrant		$ 11.50
Cannae Holdings, Inc and Thl Ftac Llc | Class A common stock
Commitments And Contingencies [Line Items]
Number of shares to be purchased	30,000,000
Share price per share	$ 10.00
Percentage of issued and outstanding shares held by initial stockholders	20.00%
Cannae Holdings, Inc and Thl Ftac Llc | Redeemable warrants
Commitments And Contingencies [Line Items]
Number of warrants to be purchased	10,000,000
Number of shares per warrant	1
Exercise price of warrant	$ 11.50
Aggregate purchase price of warrants	$ 300,000,000
Number of warrants in a unit	0.33
Cannae Holdings, Inc | Class A common stock
Commitments And Contingencies [Line Items]
Number of shares to be purchased	15,000,000
Cannae Holdings, Inc | Redeemable warrants
Commitments And Contingencies [Line Items]
Number of warrants to be purchased	5,000,000
Number of shares per warrant	1
Exercise price of warrant	$ 11.50
Aggregate purchase price of warrants	$ 150,000,000
THL FTAC LLC | Class A common stock
Commitments And Contingencies [Line Items]
Number of shares to be purchased	15,000,000
THL FTAC LLC | Redeemable warrants
Commitments And Contingencies [Line Items]
Number of warrants to be purchased	5,000,000
Number of shares per warrant	1
Exercise price of warrant	$ 11.50
Aggregate purchase price of warrants	$ 150,000,000