FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Long-term Debt Approximates Its Carrying Amount, Exceptions (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing liability: fixed-rate	$ 219.7	$ 220.6
Convertible senior note | Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible senior note	476.4	476.4
Nonrecourse | Fixed-rate | Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	622.6	657.3
Recourse | Fixed-rate | Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	862.3	940.4
Recourse | Variable-rate | Reported Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	340.6	48.4
Level 3 | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Financing liability: fixed-rate	222.9	223.4
Level 3 | Nonrecourse | Fixed-rate | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	604.0	636.5
Level 3 | Recourse | Fixed-rate | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	849.8	920.4
Level 3 | Recourse | Variable-rate | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans payable	348.3	48.5
Level 2 | Convertible senior note | Estimate of Fair Value Measurement
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Convertible senior note	$ 525.2	$ 471.2