CAPITAL STOCK (Details) $ / shares in Units, $ in Millions		1 Months Ended		12 Months Ended
	Aug. 12, 2022	Oct. 31, 2021 USD ($) tranche $ / shares shares	Oct. 31, 2020 USD ($) vote $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares		Dec. 31, 2020 USD ($)	Aug. 31, 2022 $ / shares shares	Aug. 15, 2022 $ / shares	Oct. 01, 2021 tranche	Dec. 31, 2019 USD ($)
Temporary Equity [Line Items]
Conversion ratio	0.0556
Shares authorized (in shares)								100,000,000
Common stock, par value (in dollars per share) | $ / shares								$ 0.0001	$ 0.0001
Par value (in dollars per share) | $ / shares								$ 0.0001
Preferred stock, outstanding (in shares)				14,100,000	14,100,000
Preferred stock, issued (in shares)				14,100,000	14,100,000
Preferred stock, liquidation preference | $				$ 126.5	$ 126.5
Debt issuance costs | $		$ 19.6
Carrying value | $				112.0	112.0		$ 0.0				$ 560.4
Warrants issuance costs | $					0.0
Issuance costs | $				$ 3.0	$ 10.5		$ 0.0
Preferred stock, dividend percentage				5.00%
Treasury Stock
Temporary Equity [Line Items]
Treasury stock retired (in shares)		300,000			300,000	[1]
Warrants issuance costs | $		$ 0.8			$ (0.8)	[1]
Root, Inc | Carvana
Temporary Equity [Line Items]
Ownership percentage (as percent)				9.90%
IPO
Temporary Equity [Line Items]
Proceeds from sale of stock | $			$ 1,100.0
Issuance costs | $			$ 57.5
Redeemable convertible preferred stock (as converted to common stock)
Temporary Equity [Line Items]
Debt issuance costs | $				$ 14.5
Additional Paid-In Capital
Temporary Equity [Line Items]
Debt issuance costs | $				2.7
Other Assets
Temporary Equity [Line Items]
Debt issuance costs | $				$ 2.4
Short-Term
Temporary Equity [Line Items]
Number of tranches | tranche										3
Debt issuance costs | $		$ 9.0
Carvana
Temporary Equity [Line Items]
Common stock, shares issued (in shares)				800,000
Preferred stock, issued (in shares)		14,100,000
Number of tranches | tranche		8								8
Conversion price (in dollars per share) | $ / shares		$ 9.00		$ 162.00
Class A Shares
Temporary Equity [Line Items]
Common stock, shares authorized (in shares)								1,000,000,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)				9,200,000	7,900,000
Common stock, shares outstanding (in shares)				9,200,000	7,900,000
Voting rights | vote			1
Conversion of stock (in shares)				1
Class A Shares | IPO
Temporary Equity [Line Items]
Stock sold in transaction (in shares)			1,300,000
Price of stock sold (in dollars per share) | $ / shares			$ 486.00
Class A Shares | Private placement
Temporary Equity [Line Items]
Stock sold in transaction (in shares)			1,000,000
Class B Shares
Temporary Equity [Line Items]
Common stock, shares authorized (in shares)								269,000,000
Common stock, par value (in dollars per share) | $ / shares				$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)				5,000,000.0	6,100,000
Common stock, shares outstanding (in shares)				5,000,000.0	6,100,000
Voting rights | vote			10
Series A Preferred Stock | Carvana
Temporary Equity [Line Items]
Proceeds from issuance of convertible stock | $		$ 126.5

[1] Reflects the 1-for-18 reverse stock split that became effective August 12, 2022. Refer to Note 2, “Basis of Presentation and Summary of Significant Accounting Policies.”