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FINANCE RECEIVABLES - Schedule of Finance Receivables by FICO Score (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total finance receivables $ 5,407.5 $ 4,872.8
Auto Loan Receivables    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Current year 1,497.7 2,266.5
Fiscal year before current fiscal year 1,862.8 1,124.1
Two years before current fiscal year 889.1 725.6
Three years before current fiscal year 549.9 455.4
Four years before current fiscal year 329.0 75.1
Five years before current fiscal year 51.2 5.5
Total finance receivables 5,179.7 4,652.2
Other Finance Receivables    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Total finance receivables 227.8 220.6
Less than 599 | Auto Loan Receivables    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Current year 20.4 42.0
Fiscal year before current fiscal year 34.2 34.4
Two years before current fiscal year 26.8 22.7
Three years before current fiscal year 16.7 12.0
Four years before current fiscal year 8.4 4.7
Five years before current fiscal year 3.2 0.5
Total finance receivables 109.7 116.3
FICO Score, 600 to 699 | Auto Loan Receivables    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Current year 414.5 629.9
Fiscal year before current fiscal year 529.2 369.1
Two years before current fiscal year 294.4 250.9
Three years before current fiscal year 191.0 173.0
Four years before current fiscal year 125.2 45.2
Five years before current fiscal year 30.6 3.3
Total finance receivables 1,584.9 1,471.4
FICO Score, 700 to 774 | Auto Loan Receivables    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Current year 510.9 784.1
Fiscal year before current fiscal year 652.7 382.1
Two years before current fiscal year 302.3 254.7
Three years before current fiscal year 195.8 168.4
Four years before current fiscal year 122.4 20.4
Five years before current fiscal year 14.0 1.3
Total finance receivables 1,798.1 1,611.0
FICO Score, Greater than 775 | Auto Loan Receivables    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Current year 551.9 810.5
Fiscal year before current fiscal year 646.7 338.5
Two years before current fiscal year 265.6 197.3
Three years before current fiscal year 146.4 102.0
Four years before current fiscal year 73.0 4.8
Five years before current fiscal year 3.4 0.4
Total finance receivables $ 1,687.0 $ 1,453.5