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SEGMENT INFORMATION - Segment Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Capital expenditures $ 308.2 $ 142.3 $ 107.9
Other interest expense, net 179.1 156.1 152.2
Amortization of deferred acquisition costs 0.0 6.0 18.2
Assets 10,337.0 10,159.4 8,021.4
Operating Segments      
Segment Reporting Information [Line Items]      
Capital expenditures 308.2 142.3 107.9
Other interest expense, net 179.1 156.1 152.2
Amortization of deferred acquisition costs 170.2 161.9 165.7
Assets 10,277.0 10,113.3 8,040.0
Operating Segments | Dealerships      
Segment Reporting Information [Line Items]      
Capital expenditures 308.2 142.3 107.9
Other interest expense, net 179.1 156.1 152.2
Amortization of deferred acquisition costs 0.0 0.0 0.0
Assets 9,227.6 9,199.4 7,170.8
Operating Segments | TCA      
Segment Reporting Information [Line Items]      
Capital expenditures 0.0 0.0 0.0
Other interest expense, net 0.0 0.0 0.0
Amortization of deferred acquisition costs 170.2 161.9 165.7
Assets 1,049.4 913.9 869.2
Intersegment Eliminations      
Segment Reporting Information [Line Items]      
Capital expenditures 0.0 0.0 0.0
Other interest expense, net 0.0 0.0 0.0
Amortization of deferred acquisition costs (170.2) (155.9) (147.5)
Assets $ 60.1 $ 46.1 $ (18.6)