CAPITAL STOCK (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2021 USD ($) tranche vote $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2020 USD ($)
Temporary Equity [Line Items]
Preferred stock, issued (in shares)		14,100,000		14,100,000
Preferred stock, outstanding (in shares)		14,100,000		14,100,000
Preferred stock, liquidation preference | $		$ 126.5
Debt issuance costs | $	$ 19.6	3.0
Carrying value | $		$ 112.0	$ 112.0	$ 112.0	$ 0.0
Retirement of treasury shares | $			$ 0.0
Preferred stock, dividend percentage		5.00%
Treasury Stock
Temporary Equity [Line Items]
Retirement of treasury shares (in shares)	300,000		300,000
Retirement of treasury shares | $	$ 0.8		$ (0.8)
Root, Inc | Carvana
Temporary Equity [Line Items]
Ownership percentage (as percent)		9.90%
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 | $		4.7
Other Assets
Temporary Equity [Line Items]
Debt issuance costs | $		$ 0.4
Short Term Warrant
Temporary Equity [Line Items]
Number of tranches | tranche	3
Carvana
Temporary Equity [Line Items]
Preferred stock, issued (in shares)	14,100,000
Number of tranches | tranche	8
Conversion price (in dollars per share) | $ / shares	$ 9.00	$ 162.00
Common stock, shares issued (in shares)		800,000
Class A Shares
Temporary Equity [Line Items]
Common stock, shares authorized (in shares)		1,000,000,000.0
Voting rights | vote	1
Conversion of stock (in shares)		1
Common stock, shares issued (in shares)		9,500,000		9,200,000
Class B Shares
Temporary Equity [Line Items]
Common stock, shares authorized (in shares)		269,000,000.0
Voting rights | vote	10
Common stock, shares issued (in shares)		5,000,000.0		5,000,000.0
Series A Preferred Stock | Carvana
Temporary Equity [Line Items]
Proceeds from issuance of convertible stock | $	$ 126.5